path: root/docs/Samba-Guide/SBE-500UserNetwork.xml

<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE chapter PUBLIC "-//Samba-Team//DTD DocBook V4.2-Based Variant V1.0//EN" "http://www.samba.org/samba/DTD/samba-doc">
<chapter id="Big500users">
  <title>The 500-User Office</title>

	<para>
	The Samba-3 networking you explored in <link linkend="secure"/> covers the finer points of 
	configuration of peripheral services such as DHCP and DNS, and WINS. You experienced
	implementation of a simple configuration of the services that are important adjuncts 
	to successful deployment of Samba. 
	</para>

	<para>
	An analysis of the history of postings to the Samba mailing list easily demonstrates 
	that the two most prevalent Samba problem areas are
	</para>

	<itemizedlist>
		<listitem><para>
		Defective resolution of a NetBIOS name to its IP address
		</para></listitem>

		<listitem><para>
		Printing problems
		</para></listitem>

	</itemizedlist>

	<para>
	The exercises
	so far in this book have focused on implementation of the simplest printing processes
	involving  no print job processing intelligence. In this chapter, you maintain 
	that same approach to printing, but <link linkend="happy"/> presents an opportunity 
	to make printing more complex for the administrator while making it easier for the user.
	</para>

	<para>
	<indexterm><primary>WINS server</primary></indexterm>
	<indexterm><primary>tdbsam</primary></indexterm>
	<indexterm><primary>passdb backend</primary></indexterm>
	<link linkend="secure"/> demonstrates operation of a DHCP server and a DNS server 
	as well as a central WINS server. You validated the operation of these services and
	saw an effective implementation of a Samba domain controller using the 
	<parameter>tdbsam</parameter> passdb backend.
	</para>

	<para>
	The objective of this chapter is to introduce more complex techniques that can be used to
	improve manageability of Samba as networking needs grow. In this chapter, you implement
	a distributed DHCP server environment, a distributed DNS server arrangement, a centralized
	WINS server, and a centralized Samba domain controller.
	</para>

	<para>
	A note of caution is important regarding the Samba configuration that is used in this
	chapter. The use of a single domain controller on a routed, multisegment network is 
	a poor design choice that leads to potential network user complaints. 
	This chapter demonstrates some successful 
	techniques in deployment and configuration management. This should be viewed as a 
	foundation chapter for complex Samba deployments.
	</para>

	<para>
	As you master the techniques presented here, you may find much better methods to 
	improve network management and control while reducing human resource overheads.
	You should take the opportunity to innovate and expand on the methods presented 
	here and explore them to the fullest.
	</para>

<sect1>
	<title>Introduction</title>

	<para>
	Business continues to go well for Abmas. Mr. Meany is driving your success and the
	network continues to grow thanks to the hard work Christine has done. You recently
	hired Stanley Soroka as manager of information systems. Christine recommended Stan
	to the role. She told you Stan is so good at handling Samba that he can make a cast
	iron rocking horse that is embedded in concrete kick like a horse at a rodeo. You
	need skills like his. Christine and Stan get along just fine. Let's see what 
	you can get out of this pair as they plot the next-generation networks.
	</para>

	<para>
	Ten months ago Abmas closed an acquisition of a property insurance business. The
	founder lost interest in the business and decided to sell it to Mr. Meany.  Because
	they were former university classmates, the purchase was concluded with mutual assent.
	The acquired business is located at the other end of town in much larger facilities.
	The old Abmas building has become too small. Located on the same campus as the newly
	acquired business are two empty buildings that are ideal to provide Abmas with
	opportunity for growth.
	</para>

	<para>
	Abmas has now completed the purchase of the two empty buildings, and you are
	to install a new network and relocate staff in nicely furnished new facilities.
	The new network is to be used to fully integrate company operations. You have
	decided to locate the new network operations control center in the larger building
	in which the insurance group is located to take advantage of an ideal floor space
	and to allow Stan and Christine to fully stage the new network and test it before
	it is rolled out. Your strategy is to complete the new network so that it
	is ready for operation when the old office moves into the new premises.
	</para>

	<sect2>
		<title>Assignment Tasks</title>

		<para>
		The acquired business had 280 network users. The old Abmas building housed
		220 network users in unbelievably cramped conditions. The network that
		initially served 130 users now handles 220 users quite well.
		</para>

		<para>
		The two businesses will be fully merged to create a single campus company.
		The Property Insurance Group (PIG) houses 300 employees, the new Accounting
		Services Group (ASG) will be in a small building (BLDG1) that houses 50 
		employees, and the Financial Services Group (FSG) will be housed in a large
		building that has capacity for growth (BLDG2). Building 2 houses 150 network
		users.
		</para>

		<para>
		You have decided to connect the building using fiber optic links between new
		routers. As a backup, the buildings are interconnected using line-of-sight
		high-speed infrared facilities. The infrared connection provides a
		secondary route to be used during periods of high demand for network
		bandwidth.
		</para>

		<para>
		The Internet gateway is upgraded to 15 Mb/sec service. Your ISP
		provides on your premises a fully managed Cisco PIX firewall. You no longer need
		to worry about firewall facilities on your network.
		</para>

		<para>
		Stanley and Christine have purchased new server hardware. Christine wants to
		roll out a network that has whistles and bells. Stan wants to start off with
		a simple to manage, not-too-complex network. He believes that network
		users need to be gradually introduced to new features and capabilities and not
		rushed into an environment that may cause disorientation and loss of productivity.
		</para>

		<para>
		Your intrepid network team has decided to implement a network configuration
		that closely mirrors the successful system you installed in the old Abmas building.
		The new network infrastructure is owned by Abmas, but all desktop systems
		are being procured through a new out-source services and leasing company. Under
		the terms of a deal with Mr. M. Proper (CEO), DirectPointe, Inc., provides
		all desktop systems and includes full level-one help desk support for 
		a flat per-machine monthly fee. The deal allows you to add workstations on demand.
		This frees Stan and Christine to deal with deeper issues as they emerge and 
		permits Stan to work on creating new future value-added services.
		</para>

		<para>
		DirectPointe Inc. receives from you a new standard desktop configuration
		every four months. They automatically roll that out to each desktop system.
		You must keep DirectPointe informed of all changes.
		</para>

	<para><indexterm>
	    <primary>PDC</primary>
	  </indexterm>
		The new network has a single Samba Primary Domain Controller (PDC) located in the
		Network Operation Center (NOC). Buildings 1 and 2 each have a local server
		for local application servicing. It is a domain member. The new system
		uses the <parameter>tdbsam</parameter> passdb backend.
		</para>

		<para>
		Printing is based on raw pass-through facilities just as it has been used so far.
		All printer drivers are installed on the desktop and notebook computers.
		</para>

	</sect2>
</sect1>

<sect1>
	<title>Dissection and Discussion</title>

	<para>
	<indexterm><primary>network load factors</primary></indexterm>
	The example you are building in this chapter is of a network design that works, but this
	does not make it a design that is recommended. As a general rule, there should be at least
	one Backup Domain Controller (BDC) per 150 Windows network clients. The principle behind
	this recommendation is that correct operation of MS Windows clients requires rapid
	network response to all SMB/CIFS requests. The same rule says that if there are more than
	50 clients per domain controller, they are too busy to service requests. Let's put such
	rules aside and recognize that network load affects the integrity of domain controller
	responsiveness. This network will have 500 clients serviced by one central domain
	controller. This is not a good omen for user satisfaction. You, of course, address this
	very soon (see <link linkend="happy"/>).
	</para>

	<sect2>
		<title>Technical Issues</title>

		<para>
		Stan has talked you into a horrible compromise, but it is addressed. Just make
		certain that the performance of this network is well validated before going live.
		</para>

		<para>
		Design decisions made in this design include the following:
		</para>

		<itemizedlist>
			<listitem><para>
			<indexterm><primary>PDC</primary></indexterm>
			<indexterm><primary>LDAP</primary></indexterm>
			<indexterm><primary>identity management</primary></indexterm>
			A single PDC is being implemented. This limitation is based on the choice not to
			use LDAP. Many network administrators fear using LDAP because of the perceived
			complexity of implementation and management of an LDAP-based backend for all user
			identity management as well as to store network access credentials.
			</para></listitem>

			<listitem><para>
			<indexterm><primary>BDC</primary></indexterm>
			<indexterm><primary>machine secret password</primary></indexterm>
			Because of the refusal to use an LDAP (ldapsam) passdb backend at this time, the
			only choice that makes sense with 500 users is to use the tdbsam passwd backend. 
			This type of backend is not receptive to replication to BDCs.  If the tdbsam
			<filename>passdb.tdb</filename> file is replicated to BDCs using
			<command>rsync</command>, there are two potential problems: (1) data that is in
			memory but not yet written to disk will not be replicated, and (2) domain member
			machines periodically change the secret machine password. When this happens, there
			is no mechanism to return the changed password to the PDC.
			</para></listitem>

			<listitem><para>
			All domain user, group, and machine accounts are managed on the PDC. This makes
			for a simple mode of operation but has to be balanced with network performance and
			integrity of operations considerations.
			</para></listitem>

			<listitem><para>
			<indexterm><primary>WINS</primary></indexterm>
			A single central WINS server is being used. The PDC is also the WINS server.
			Any attempt to operate a routed network without a WINS server while using NetBIOS
			over TCP/IP protocols does not work unless on each client the name resolution
			entries for the PDC are added to the <filename>LMHOSTS</filename>. This file is
			normally located on the Windows XP Professional client in the 
			<filename>C:\WINDOWS\SYSTEM32\ETC\DRIVERS</filename> directory.
			</para></listitem>

			<listitem><para>
			At this time the Samba WINS database cannot be replicated. That is
			why a single WINS server is being implemented. This should work without a problem.
			</para></listitem>

			<listitem><para>
			<indexterm><primary>winbindd</primary></indexterm>
			BDCs make use of <command>winbindd</command> to provide
			access to domain security credentials for file system access and object storage.
			</para></listitem>

			<listitem><para>
			<indexterm><primary>DHCP</primary><secondary>relay</secondary></indexterm>
			<indexterm><primary>DHCP</primary><secondary>requests</secondary></indexterm>
			Configuration of Windows XP Professional clients is achieved using DHCP. Each
			subnet has its own DHCP server. Backup DHCP serving is provided by one
			alternate DHCP server. This necessitates enabling of the DHCP Relay agent on
			all routers. The DHCP Relay agent must be programmed to pass DHCP Requests from the
			network directed at the backup DHCP server.
			</para></listitem>

			<listitem><para>
			All network users are granted the ability to print to any printer that is
			network-attached. All printers are available from each server. Print jobs that
			are spooled to a printer that is not on the local network segment are automatically
			routed to the print spooler that is in control of that printer. The specific details
			of how this might be done are demonstrated for one example only.
			</para></listitem>

			<listitem><para>
			The network address and subnetmask chosen provide 1022 usable IP addresses in
			each subnet. If in the future more addresses are required, it would make sense
			to add further subnets rather than change addressing.
			</para></listitem>

		</itemizedlist>

	</sect2>


	<sect2>
		<title>Political Issues</title>

		<para>
		This case gets close to the real world. You and I know the right way to implement
		domain control. Politically, we have to navigate a minefield. In this case, the need is to
		get the PDC rolled out in compliance with expectations and also to be ready to save the day
		by having the real solution ready before it is needed. That real solution is presented in
		Chapter 5.
		</para>

	</sect2>

</sect1>

<sect1>
	<title>Implementation</title>

	<para>
	The following configuration process begins following installation of Red Hat Fedora Core2 on the
	three servers shown in the network topology diagram in <link linkend="chap05net"/>. You have
	selected hardware that is appropriate to the task.
	</para>

	<image id="chap05net">
		<imagedescription>Network Topology &smbmdash; 500 User Network Using tdbsam passdb backend.</imagedescription>
		<imagefile scale="50">chap5-net</imagefile>
	</image>

	<sect2 id="ch5-dnshcp-setup">
	<title>Installation of DHCP, DNS, and Samba Control Files</title>

	<para>
	Carefully install the configuration files into the correct locations as shown in 
	<link linkend="ch5-filelocations"/>. You should validate that the full file path is
	correct as shown.
	</para>

	<para>
	The abbreviation shown in this table as <constant>{VLN}</constant> refers to
	the directory location beginning with <filename>/var/lib/named</filename>.
	</para>


	<table id="ch5-filelocations"><title>Domain: <constant>MEGANET</constant>, File Locations for Servers</title>
		<tgroup cols="5">
			<colspec colname='c1' align="left"/>
			<colspec colname='c2' align="left"/>
			<colspec colname='c3' align="center"/>
			<colspec colname='c4' align="center"/>
			<colspec colname='c5' align="center"/>
			<thead>
				<row>
					<entry align="center" namest='c1' nameend='c2'>File Information</entry>
					<entry align="center" namest="c3" nameend="c5">Server Name</entry>
				</row>
				<row>
					<entry align="center">Source</entry>
					<entry align="center">Target Location</entry>
					<entry align="center">MASSIVE</entry>
					<entry align="center">BLDG1</entry>
					<entry align="center">BLDG2</entry>
				</row>
			</thead>
			<tbody>
				<row>
					<entry><link linkend="ch5-massivesmb"/></entry>
					<entry><filename>/etc/samba/smb.conf</filename></entry>
					<entry>Yes</entry>
					<entry>No</entry>
					<entry>No</entry>
				</row>
				<row>
					<entry><link linkend="ch5-dc-common"/></entry>
					<entry><filename>/etc/samba/dc-common.conf</filename></entry>
					<entry>Yes</entry>
					<entry>No</entry>
					<entry>No</entry>
				</row>
				<row>
					<entry><link linkend="ch5-commonsmb"/></entry>
					<entry><filename>/etc/samba/common.conf</filename></entry>
					<entry>Yes</entry>
					<entry>Yes</entry>
					<entry>Yes</entry>
				</row>
				<row>
					<entry><link linkend="ch5-bldg1-smb"/></entry>
					<entry><filename>/etc/samba/smb.conf</filename></entry>
					<entry>No</entry>
					<entry>Yes</entry>
					<entry>No</entry>
				</row>
				<row>
					<entry><link linkend="ch5-bldg2-smb"/></entry>
					<entry><filename>/etc/samba/smb.conf</filename></entry>
					<entry>No</entry>
					<entry>No</entry>
					<entry>Yes</entry>
				</row>
				<row>
					<entry><link linkend="ch5-dommem-smb"/></entry>
					<entry><filename>/etc/samba/dommem.conf</filename></entry>
					<entry>No</entry>
					<entry>Yes</entry>
					<entry>Yes</entry>
				</row>
				<row>
					<entry><link linkend="massive-dhcp"/></entry>
					<entry><filename>/etc/dhcpd.conf</filename></entry>
					<entry>Yes</entry>
					<entry>No</entry>
					<entry>No</entry>
				</row>
				<row>
					<entry><link linkend="bldg1dhcp"/></entry>
					<entry><filename>/etc/dhcpd.conf</filename></entry>
					<entry>No</entry>
					<entry>Yes</entry>
					<entry>No</entry>
				</row>
				<row>
					<entry><link linkend="bldg2dhcp"/></entry>
					<entry><filename>/etc/dhcpd.conf</filename></entry>
					<entry>No</entry>
					<entry>No</entry>
					<entry>Yes</entry>
				</row>
				<row>
					<entry><link linkend="massive-nameda"/></entry>
					<entry><filename>/etc/named.conf (part A)</filename></entry>
					<entry>Yes</entry>
					<entry>No</entry>
					<entry>No</entry>
				</row>
				<row>
					<entry><link linkend="massive-namedb"/></entry>
					<entry><filename>/etc/named.conf (part B)</filename></entry>
					<entry>Yes</entry>
					<entry>No</entry>
					<entry>No</entry>
				</row>
				<row>
					<entry><link linkend="massive-namedc"/></entry>
					<entry><filename>/etc/named.conf (part C)</filename></entry>
					<entry>Yes</entry>
					<entry>No</entry>
					<entry>No</entry>
				</row>
				<row>
					<entry><link linkend="abmasbizdns"/></entry>
					<entry><filename>{VLN}/master/abmas.biz.hosts</filename></entry>
					<entry>Yes</entry>
					<entry>No</entry>
					<entry>No</entry>
				</row>
				<row>
					<entry><link linkend="abmasusdns"/></entry>
					<entry><filename>{VLN}/master/abmas.us.hosts</filename></entry>
					<entry>Yes</entry>
					<entry>No</entry>
					<entry>No</entry>
				</row>
				<row>
					<entry><link linkend="bldg12nameda"/></entry>
					<entry><filename>/etc/named.conf (part A)</filename></entry>
					<entry>No</entry>
					<entry>Yes</entry>
					<entry>Yes</entry>
				</row>
				<row>
					<entry><link linkend="bldg12namedb"/></entry>
					<entry><filename>/etc/named.conf (part B)</filename></entry>
					<entry>No</entry>
					<entry>Yes</entry>
					<entry>Yes</entry>
				</row>
				<row>
					<entry><link linkend="loopback"/></entry>
					<entry><filename>{VLN}/localhost.zone</filename></entry>
					<entry>Yes</entry>
					<entry>Yes</entry>
					<entry>Yes</entry>
				</row>
				<row>
					<entry><link linkend="dnsloopy"/></entry>
					<entry><filename>{VLN}/127.0.0.zone</filename></entry>
					<entry>Yes</entry>
					<entry>Yes</entry>
					<entry>Yes</entry>
				</row>
				<row>
					<entry><link linkend="roothint"/></entry>
					<entry><filename>{VLN}/root.hint</filename></entry>
					<entry>Yes</entry>
					<entry>Yes</entry>
					<entry>Yes</entry>
				</row>
			</tbody>
		</tgroup>
	</table>

	</sect2>

	<sect2>
	<title>Server Preparation: All Servers</title>

	<para>
	The following steps apply to all servers. Follow each step carefully.
	</para>

		<procedure>
			<step><para>
			Using the UNIX/Linux system tools, set the name of the server as shown in the network
			topology diagram in <link linkend="chap05net"/>. For SUSE Linux products, the tool
			that permits this is called <command>yast2</command>; for Red Hat Linux products,
			you can use the <command>netcfg</command> tool.
			Verify that your hostname is correctly set by running:
<screen>
&rootprompt; uname -n
</screen>
			An alternate method to verify the hostname is:
<screen>
&rootprompt; hostname -f
</screen>
			</para></step>

			 <step><para>
	      <indexterm><primary>/etc/hosts</primary></indexterm><indexterm>
		<primary>named</primary>
	      </indexterm>
			Edit your <filename>/etc/hosts</filename> file to include the primary names and addresses
			of all network interfaces that are on the host server. This is necessary so that during
			startup the system is able to resolve all its own names to the IP address prior to
			startup of the DNS server. You should check the startup order of your system. If the 
			CUPS print server is started before the DNS server (<command>named</command>), you 
			should also include an entry for the printers in the <filename>/etc/hosts</filename> file.
			</para></step>

			<step><para>
			<indexterm><primary>/etc/resolv.conf</primary></indexterm>
			All DNS name resolution should be handled locally. To ensure that the server is configured
			correctly to handle this, edit <filename>/etc/resolv.conf</filename> so it has the following
			content:
<screen>
search abmas.us abmas.biz
nameserver 127.0.0.1
</screen>
			This instructs the name resolver function (when configured correctly) to ask the DNS server
			that is running locally to resolve names to addresses.
			</para></step>


			<step><para>
	      <indexterm><primary>administrator</primary></indexterm><indexterm>
		<primary>smbpasswd</primary>
	      </indexterm>
			Add the <constant>root</constant> user to the password backend:
<screen>
&rootprompt; smbpasswd -a root
New SMB password: XXXXXXXX
Retype new SMB password: XXXXXXXX
&rootprompt;
</screen>
			The <constant>root</constant> account is the UNIX equivalent of the Windows domain administrator.
			This account is essential in the regular maintenance of your Samba server. It must never be
			deleted. If for any reason the account is deleted, you may not be able to recreate this account
			without considerable trouble.
			</para></step>

			<step><para>
	      <indexterm><primary>username map</primary></indexterm><indexterm>
		<primary>/etc/samba/smbusers</primary>
	      </indexterm>
			Create the username map file to permit the <constant>root</constant> account to be called
			<constant>Administrator</constant> from the Windows network environment. To do this, create
			the file <filename>/etc/samba/smbusers</filename> with the following contents:
<screen>
####
# User mapping file
####
# File Format
# -----------
# Unix_ID = Windows_ID
#
# Examples:
# root = Administrator
# janes = "Jane Smith"
# jimbo = Jim Bones
#
# Note: If the name contains a space it must be double quoted.
#       In the example above the name 'jimbo' will be mapped to Windows
#       user names 'Jim' and 'Bones' because the space was not quoted.
#######################################################################
root = Administrator
####
# End of File
####
</screen>
			</para></step>

			<step><para>
			Configure all network-attached printers to have a fixed IP address.
			</para></step>

			<step><para>
			Create an entry in the DNS database on the server <constant>MASSIVE</constant>
			in both the forward lookup database for the zone <constant>abmas.biz.hosts</constant>
			and in the reverse lookup database for the network segment that the printer is
			located in. Example configuration files for similar zones were presented in Chapter 3,
			<link linkend="abmasbiz"/> and <link linkend="eth2zone"/>.
			</para></step>

			<step><para>
			Follow the instructions in the printer manufacturer's manuals to permit printing 
			to port 9100.  Use any other port the manufacturer specifies for direct mode, 
			raw printing.  This allows the CUPS spooler to print using raw mode protocols.
			<indexterm><primary>CUPS</primary></indexterm>
			<indexterm><primary>raw printing</primary></indexterm>
			</para></step>

			<step><para>
			<indexterm><primary>CUPS</primary><secondary>queue</secondary></indexterm>
			Only on the server to which the printer is attached configure the CUPS Print 
			Queues as follows:
<screen>
&rootprompt; lpadmin -p <parameter>printque</parameter> -v socket://<parameter>printer-name</parameter>.abmas.biz:9100 -E
</screen>
			<indexterm><primary>print filter</primary></indexterm>
			This step creates the necessary print queue to use no assigned print filter. This
			is ideal for raw printing, that is, printing without use of filters.
			The name <parameter>printque</parameter> is the name you have assigned for
			the particular printer.
			</para></step>

			<step><para>
			Print queues may not be enabled at creation. Make certain that the queues
			you have just created are enabled by executing the following:
<screen>
&rootprompt; /usr/bin/enable <parameter>printque</parameter>
</screen>
			</para></step>

			<step><para>
			Even though your print queue may be enabled, it is still possible that it
			does not accept print jobs. A print queue services incoming printing
			requests only when configured to do so. Ensure that your print queue is
			set to accept incoming jobs by executing the following command:
<screen>
&rootprompt; /usr/bin/accept <parameter>printque</parameter>
</screen>
			</para></step>

			<step><para>
			<indexterm><primary>mime type</primary></indexterm>
			<indexterm><primary>/etc/mime.convs</primary></indexterm>
			<indexterm><primary>application/octet-stream</primary></indexterm>
			Edit the file <filename>/etc/cups/mime.convs</filename> to uncomment the line:
<screen>
application/octet-stream     application/vnd.cups-raw      0     -
</screen>
			</para></step>

			<step><para>
			<indexterm><primary>/etc/mime.types</primary></indexterm>
			Edit the file <filename>/etc/cups/mime.types</filename> to uncomment the line:
<screen>
application/octet-stream
</screen>
			</para></step>

			<step><para>
			Refer to the CUPS printing manual for instructions regarding how to configure
			CUPS so that print queues that reside on CUPS servers on remote networks
			route print jobs to the print server that owns that queue. The default setting
			on your CUPS server may automatically discover remotely installed printers and
			may permit this functionality without requiring specific configuration.
			</para></step>

			<step><para>
			As part of the roll-out program, you need to configure the application's
			server shares. This can be done once on the central server and may then be
			replicated using a tool such as <command>rsync</command>. Refer to the man
			page for <command>rsync</command> for details regarding use. The notes in	
			<link linkend="ch4appscfg"/> may help in your decisions to use an application
			server facility.
			</para></step>

		</procedure>

	<note><para>
	Logon scripts that are run from a domain controller (PDC or BDC) are capable of using semi-intelligent
	processes to automap Windows client drives to an application server that is nearest to the client. This
	is considerably more difficult when a single PDC is used on a routed network. It can be done, but not
	as elegantly as you see in the next chapter.
	</para></note>

	</sect2>

	<sect2>
	<title>Server-Specific Preparation</title>

	<para>
	There are some steps that apply to particular server functionality only. Each step is critical
	to correct server operation.
	</para>

		<sect3>
		<title>Configuration for Server: <constant>MASSIVE</constant></title>

		<procedure>
			<step><para>
			<indexterm><primary>/etc/rc.d/boot.local</primary></indexterm>
			<indexterm><primary>IP forwarding</primary></indexterm>
			The host server acts as a router between the two internal network segments as well
			as for all Internet access. This necessitates that IP forwarding be enabled. This can be
			achieved by adding to the <filename>/etc/rc.d/boot.local</filename> an entry as follows:
<screen>
echo 1 > /proc/sys/net/ipv4/ip_forward
</screen>
			To ensure that your kernel is capable of IP forwarding during configuration, you may wish to execute
			that command manually also. This setting permits the Linux system to act as a router.
			</para></step>

			<step><para>
			This server is dual hosted (i.e., has two network interfaces) &smbmdash; one goes to the Internet
			and the other to a local network that has a router that is the gateway to the remote networks.
			You must therefore configure the server with route table entries so that it can find machines
			on the remote networks. You can do this using the appropriate system tools for your Linux
			server or using static entries that you place in one of the system startup files. It is best
			to always use the tools that the operating system vendor provided. In the case of SUSE Linux, the
			best tool to do this is YaST (refer to SUSE Administration Manual); in the case of Red Hat,
			this is best done using the graphical system configuration tools (see the Red Hat documentation).
			An example of how this may be done manually is as follows:
<screen>
&rootprompt; route add net 172.16.4.0 netmask 255.255.252.0 gw 172.16.0.128
&rootprompt; route add net 172.16.8.0 netmask 255.255.252.0 gw 172.16.0.128
</screen>
			If you just execute these commands manually, the route table entries you have created are
			not persistent across system reboots. You may add these commands directly to the local
			startup files as follows: (SUSE) <filename>/etc/rc.d/boot.local</filename>, (Red Hat)
			<filename>/etc/rc.d/init.d/rc.local</filename>.
			</para></step>

			<step><para>
			<indexterm><primary>/etc/nsswitch.conf</primary></indexterm>
			The final step that must be completed is to edit the <filename>/etc/nsswitch.conf</filename> file.
			This file controls the operation of the various resolver libraries that are part of the Linux
			Glibc libraries. Edit this file so that it contains the following entries:
<screen>
hosts:      files dns wins
</screen>
			</para></step>

			<step><para>
			<indexterm><primary>initGrps.sh</primary></indexterm>
			Create and map Windows domain groups to UNIX groups. A sample script is provided in
			<link linkend="ch5-initgrps"/>. Create a file containing this script. You called yours
			<filename>/etc/samba/initGrps.sh</filename>. Set this file so it can be executed
			and then execute the script. An example of the execution of this script as well as its
			validation are shown in Section 4.3.2, Step 5.
			</para></step>

			<step><para>
			<indexterm><primary>/etc/passwd</primary></indexterm>
			<indexterm><primary>password</primary><secondary>backend</secondary></indexterm>
			<indexterm><primary>smbpasswd</primary></indexterm>
			For each user who needs to be given a Windows domain account, make an entry in the
			<filename>/etc/passwd</filename> file as well as in the Samba password backend.
			Use the system tool of your choice to create the UNIX system account, and use the Samba
			<command>smbpasswd</command> to create a domain user account.
			</para>

			<para>
			<indexterm><primary>useradd</primary></indexterm>
			<indexterm><primary>adduser</primary></indexterm>
			<indexterm><primary>user</primary><secondary>management</secondary></indexterm>
			There are a number of tools for user management under UNIX, such as
			<command>useradd</command>, <command>adduser</command>, as well as a plethora of custom
			tools. With the tool of your choice, create a home directory for each user.
			</para></step>

			<step><para>
			Using the preferred tool for your UNIX system, add each user to the UNIX groups created
			previously as necessary. File system access control is based on UNIX group membership.
			</para></step>

			<step><para>
			Create the directory mount point for the disk subsystem that is to be mounted to provide
			data storage for company files, in this case, the mount point indicated in the &smb.conf;
			file is <filename>/data</filename>. Format the file system as required and mount the formatted
			file system partition using appropriate system tools.
			</para></step>

			<step><para>
		<indexterm><primary>file system</primary>
		  <secondary>permissions</secondary></indexterm>
			Create the top-level file storage directories for data and applications as follows:
<screen>
&rootprompt; mkdir -p /data/{accounts,finsvcs,pidata}
&rootprompt; mkdir -p /apps
&rootprompt; chown -R root.root /data
&rootprompt; chown -R root.root /apps
&rootprompt; chown -R bjordan.accounts /data/accounts
&rootprompt; chown -R bjordan.finsvcs /data/finsvcs
&rootprompt; chown -R bjordan.finsvcs /data/pidata
&rootprompt; chmod -R ug+rwxs,o-rwx /data
&rootprompt; chmod -R ug+rwx,o+rx-w /apps
</screen>
			Each department is responsible for creating its own directory structure within the departmental
			share. The directory root of the <command>accounts</command> share is <filename>/data/accounts</filename>.
			The directory root of the <command>finsvcs</command> share is <filename>/data/finsvcs</filename>.
			The <filename>/apps</filename> directory is the root of the <constant>apps</constant> share
			that provides the application server infrastructure.
			</para></step>

			<step><para>
			The &smb.conf; file specifies an infrastructure to support roaming profiles and network
			logon services. You can now create the file system infrastructure to provide the
			locations on disk that these services require. Adequate planning is essential
			because desktop profiles can grow to be quite large. For planning purposes, a minimum of
			200 MB of storage should be allowed per user for profile storage. The following
			commands create the directory infrastructure needed:
<screen>
&rootprompt; mkdir -p /var/spool/samba
&rootprompt; mkdir -p /var/lib/samba/{netlogon/scripts,profiles}
&rootprompt; chown -R root.root /var/spool/samba
&rootprompt; chown -R root.root /var/lib/samba
&rootprompt; chmod a+rwxt /var/spool/samba
</screen>
			For each user account that is created on the system, the following commands should be
			executed:
<screen>
&rootprompt; mkdir /var/lib/samba/profiles/'username'
&rootprompt; chown 'username'.users /var/lib/samba/profiles/'username'
&rootprompt; chmod ug+wrx,o+rx,-w /var/lib/samba/profiles/'username'
</screen>
			</para></step>

			<step><para>
			Create a logon script. It is important that each line is correctly terminated with
			a carriage return and line-feed combination (i.e., DOS encoding). The following procedure
			works if the right tools (<constant>unxi2dos</constant> and <constant>dos2unix</constant>) are installed.
			First, create a file called <filename>/var/lib/samba/netlogon/scripts/logon.bat.unix</filename>
			with the following contents:
<screen>
net time \\massive /set /yes
net use h: /home
</screen>
			Convert the UNIX file to a DOS file:
<screen>
&rootprompt; dos2unix &lt; /var/lib/samba/netlogon/scripts/logon.bat.unix \
        &gt; /var/lib/samba/netlogon/scripts/logon.bat
</screen>
			</para></step>

			<step><para>
			There is one preparatory step without which you cannot have a working Samba network
			environment. You must add an account for each network user. You can do this by executing
			the following steps for each user:
<screen>
&rootprompt; useradd -m <parameter>username</parameter>
&rootprompt; passwd <parameter>username</parameter>
Changing password for <parameter>username</parameter>.
New password: XXXXXXXX
Re-enter new password: XXXXXXXX
Password changed
&rootprompt; smbpasswd -a <parameter>username</parameter>
New SMB password: XXXXXXXX
Retype new SMB password: XXXXXXXX
Added user <parameter>username</parameter>.
</screen>
			You do, of course, use a valid user login ID in place of <parameter>username</parameter>.
			</para></step>

			<step><para>
			Follow the processes shown in <link linkend="ch5-procstart"/> to start all services.
			</para></step>

			<step><para>
			Your server is ready for validation testing. Do not proceed with the steps in
			<link linkend="ch5-domsvrspec"/> until after the operation of the server has been
			validated following the same methods as outlined in Chapter 3, <link linkend="ch4valid"/>.
			</para></step>

		</procedure>
		
		</sect3>

		<sect3 id="ch5-domsvrspec">
		<title>Configuration Specific to Domain Member Servers: <constant>BLDG1, BLDG2</constant></title>

		<procedure>
                        <step><para>
                        <indexterm><primary>/etc/nsswitch.conf</primary></indexterm>
                        The final step that must be completed is to edit the <filename>/etc/nsswitch.conf</filename> file.
                        This file controls the operation of the various resolver libraries that are part of the Linux
                        Glibc libraries. Edit this file so that it contains the following entries:
<screen>
passwd:     files winbind
group:      files winbind
hosts:      files dns wins
</screen>
                        </para></step>

			<step><para>
			Follow the steps outlined in <link linkend="ch5-procstart"/> to start all services. Do not
			start Samba at this time. Samba is controlled by the process called <command>smb</command>.
			</para></step>

	    <step><para><indexterm>
		  <primary>net</primary>
		  <secondary>rpc</secondary>
		  <tertiary>join</tertiary>
		</indexterm>
			You must now attempt to join the domain member servers to the domain. The following
			instructions should be executed to effect this:
<screen>
&rootprompt; net rpc join 
</screen>
			</para></step>

	    <step><para><indexterm>
		  <primary>service</primary>
		  <secondary>smb</secondary>
		  <tertiary>start</tertiary>
		</indexterm>
			You now start the Samba services by executing:
<screen>
&rootprompt; service smb start
</screen>
			</para></step>

                        <step><para>
                        Your server is ready for validation testing. Do not proceed with the steps in
                        <link linkend="ch5-domsvrspec"/> until after the operation of the server has been
                        validated following the same methods as outlined in <link linkend="ch4valid"/>.
                        </para></step>

		</procedure>

		</sect3>

	</sect2>

<!-- One -->
<smbconfexample id="ch5-massivesmb">
<title>Server: MASSIVE (PDC), File: <filename>/etc/samba/smb.conf</filename></title>
<smbconfcomment>Global parameters</smbconfcomment>
<smbconfsection name="[global]"/>
<smbconfoption name="workgroup">MEGANET</smbconfoption>
<smbconfoption name="netbios name">MASSIVE</smbconfoption>
<smbconfoption name="interfaces">eth1, lo</smbconfoption>
<smbconfoption name="bind interfaces only">Yes</smbconfoption>
<smbconfoption name="passdb backend">tdbsam</smbconfoption>
<smbconfoption name="add user script">/usr/sbin/useradd -m '%u'</smbconfoption>
<smbconfoption name="delete user script">/usr/sbin/userdel -r '%u'</smbconfoption>
<smbconfoption name="add group script">/usr/sbin/groupadd '%g'</smbconfoption>
<smbconfoption name="delete group script">/usr/sbin/groupdel '%g'</smbconfoption>
<smbconfoption name="add user to group script">/usr/sbin/usermod -G '%g' '%u'</smbconfoption>
<smbconfoption name="add machine script">/usr/sbin/</smbconfoption>
<member><parameter>useradd -s /bin/false -d /var/lib/nobody '%u'</parameter></member>
<smbconfoption name="preferred master">Yes</smbconfoption>
<smbconfoption name="wins support">Yes</smbconfoption>
<smbconfoption name="include">/etc/samba/dc-common.conf</smbconfoption>

<smbconfsection name="[IPC$]"/>
<smbconfoption name="path">/tmp</smbconfoption>
<smbconfoption name="hosts allow">172.16.0.0/16, 127.0.0.1</smbconfoption>
<smbconfoption name="hosts deny">0.0.0.0/0</smbconfoption>

<smbconfsection name="[accounts]"/>
<smbconfoption name="comment">Accounting Files</smbconfoption>
<smbconfoption name="path">/data/accounts</smbconfoption>
<smbconfoption name="read only">No</smbconfoption>

<smbconfsection name="[service]"/>
<smbconfoption name="comment">Financial Services Files</smbconfoption>
<smbconfoption name="path">/data/service</smbconfoption>
<smbconfoption name="read only">No</smbconfoption>

<smbconfsection name="[pidata]"/>
<smbconfoption name="comment">Property Insurance Files</smbconfoption>
<smbconfoption name="path">/data/pidata</smbconfoption>
<smbconfoption name="read only">No</smbconfoption>
</smbconfexample>

<!-- Two -->
<smbconfexample id="ch5-dc-common">
<title>Server: MASSIVE (PDC), File: <filename>/etc/samba/dc-common.conf</filename></title>
<smbconfcomment>Global parameters</smbconfcomment>
<smbconfsection name="[global]"/>
<smbconfoption name="shutdown script">/var/lib/samba/scripts/shutdown.sh</smbconfoption>
<smbconfoption name="abort shutdown script">/sbin/shutdown -c</smbconfoption>
<smbconfoption name="logon script">scripts\logon.bat</smbconfoption>
<smbconfoption name="logon path">\%L\profiles\%U</smbconfoption>
<smbconfoption name="logon drive">X:</smbconfoption>
<smbconfoption name="logon home">\%L\%U</smbconfoption>
<smbconfoption name="domain logons">Yes</smbconfoption>
<smbconfoption name="preferred master">Yes</smbconfoption>
<smbconfoption name="include">/etc/samba/common.conf</smbconfoption>

<smbconfsection name="[homes]"/>
<smbconfoption name="comment">Home Directories</smbconfoption>
<smbconfoption name="valid users">%S</smbconfoption>
<smbconfoption name="read only">No</smbconfoption>
<smbconfoption name="browseable">No</smbconfoption>

<smbconfsection name="[netlogon]"/>
<smbconfoption name="comment">Network Logon Service</smbconfoption>
<smbconfoption name="path">/var/lib/samba/netlogon</smbconfoption>
<smbconfoption name="guest ok">Yes</smbconfoption>
<smbconfoption name="locking">No</smbconfoption>

<smbconfsection name="[profiles]"/>
<smbconfoption name="comment">Profile Share</smbconfoption>
<smbconfoption name="path">/var/lib/samba/profiles</smbconfoption>
<smbconfoption name="read only">No</smbconfoption>
<smbconfoption name="profile acls">Yes</smbconfoption>
</smbconfexample>

<!-- Three -->
<smbconfexample id="ch5-commonsmb">
<title>Common Samba Configuration File: <filename>/etc/samba/common.conf</filename></title>
<smbconfsection name="[global]"/>
<smbconfoption name="username map">/etc/samba/smbusers</smbconfoption>
<smbconfoption name="log level">1</smbconfoption>
<smbconfoption name="syslog">0</smbconfoption>
<smbconfoption name="log file">/var/log/samba/%m</smbconfoption>
<smbconfoption name="max log size">50</smbconfoption>
<smbconfoption name="smb ports">139 445</smbconfoption>
<smbconfoption name="name resolve order">wins bcast hosts</smbconfoption>
<smbconfoption name="time server">Yes</smbconfoption>
<smbconfoption name="printcap name">CUPS</smbconfoption>
<smbconfoption name="show add printer wizard">No</smbconfoption>
<smbconfoption name="shutdown script">/var/lib/samba/scripts/shutdown.sh</smbconfoption>
<smbconfoption name="abort shutdown script">/sbin/shutdown -c</smbconfoption>
<smbconfoption name="utmp">Yes</smbconfoption>
<smbconfoption name="map acl inherit">Yes</smbconfoption>
<smbconfoption name="printing">cups</smbconfoption>
<smbconfoption name="veto files">/*.eml/*.nws/*.{*}/</smbconfoption>
<smbconfoption name="veto oplock files">/*.doc/*.xls/*.mdb/</smbconfoption>
<smbconfoption name="include"> </smbconfoption>

<smbconfcomment>Share and Service Definitions are common to all servers</smbconfcomment>
<smbconfsection name="[printers]"/>
<smbconfoption name="comment">SMB Print Spool</smbconfoption>
<smbconfoption name="path">/var/spool/samba</smbconfoption>
<smbconfoption name="guest ok">Yes</smbconfoption>
<smbconfoption name="printable">Yes</smbconfoption>
<smbconfoption name="use client driver">Yes</smbconfoption>
<smbconfoption name="default devmode">Yes</smbconfoption>
<smbconfoption name="browseable">No</smbconfoption>

<smbconfsection name="[apps]"/>
<smbconfoption name="comment">Application Files</smbconfoption>
<smbconfoption name="path">/apps</smbconfoption>
<smbconfoption name="admin users">bjordan</smbconfoption>
<smbconfoption name="read only">No</smbconfoption>
</smbconfexample>

<!-- Four -->
<smbconfexample id="ch5-bldg1-smb">
<title>Server: BLDG1 (Member), File: smb.conf</title>
<smbconfcomment>Global parameters</smbconfcomment>
<smbconfsection name="[global]"/>
<smbconfoption name="workgroup">MEGANET</smbconfoption>
<smbconfoption name="netbios name">BLDG1</smbconfoption>
<smbconfoption name="include">/etc/samba/dom-mem.conf</smbconfoption>
</smbconfexample>

<!-- Five -->
<smbconfexample id="ch5-bldg2-smb">
<title>Server: BLDG2 (Member), File: smb.conf</title>
<smbconfcomment>Global parameters</smbconfcomment>
<smbconfsection name="[global]"/>
<smbconfoption name="workgroup">MEGANET</smbconfoption>
<smbconfoption name="netbios name">BLDG2</smbconfoption>
<smbconfoption name="include">/etc/samba/dom-mem.conf</smbconfoption>
</smbconfexample>

<!-- Six -->
<smbconfexample id="ch5-dommem-smb">
<title>Common Domain Member Include File: dom-mem.conf</title>
<smbconfcomment>Global parameters</smbconfcomment>
<smbconfsection name="[global]"/>
<smbconfoption name="shutdown script">/var/lib/samba/scripts/shutdown.sh</smbconfoption>
<smbconfoption name="abort shutdown script">/sbin/shutdown -c</smbconfoption>
<smbconfoption name="preferred master">Yes</smbconfoption>
<smbconfoption name="wins server">172.16.0.1</smbconfoption>
<smbconfoption name="idmap uid">15000-20000</smbconfoption>
<smbconfoption name="idmap gid">15000-20000</smbconfoption>
<smbconfoption name="include">/etc/samba/common.conf</smbconfoption>
</smbconfexample>

<!-- Seven -->
<example id="massive-dhcp">
<title>Server: MASSIVE, File: dhcpd.conf</title>
<screen>
# Abmas Accounting Inc. - Chapter 5/MASSIVE

default-lease-time 86400;
max-lease-time 172800;
default-lease-time 86400;
ddns-updates on;
ddns-update-style ad-hoc;

option ntp-servers 172.16.0.1;
option domain-name "abmas.biz";
option domain-name-servers 172.16.0.1, 172.16.4.1;
option netbios-name-servers 172.16.0.1;
option netbios-node-type 8;

subnet 172.16.1.0 netmask 255.255.252.0 {
        range dynamic-bootp 172.16.1.0 172.16.2.255;
        option subnet-mask 255.255.252.0;
        option routers 172.16.0.1, 172.16.0.128;
        allow unknown-clients;
	}
subnet 172.16.4.0 netmask 255.255.252.0 {
        range dynamic-bootp 172.16.7.0 172.16.7.254;
        option subnet-mask 255.255.252.0;
        option routers 172.16.4.128;
        allow unknown-clients;
	}
subnet 172.16.8.0 netmask 255.255.252.0 {
        range dynamic-bootp 172.16.11.0 172.16.11.254;
        option subnet-mask 255.255.252.0;
        option routers 172.16.4.128;
        allow unknown-clients;
	}
subnet 127.0.0.0 netmask 255.0.0.0 {
        }
subnet 123.45.67.64 netmask 255.255.255.252 {
        }
</screen>
</example>

<!-- Eight -->
<example id="bldg1dhcp">
<title>Server: BLDG1, File: dhcpd.conf</title>
<screen>
# Abmas Accounting Inc. - Chapter 5/BLDG1

default-lease-time 86400;
max-lease-time 172800;
default-lease-time 86400;
ddns-updates on;
ddns-update-style ad-hoc;

option ntp-servers 172.16.0.1;
option domain-name "abmas.biz";
option domain-name-servers 172.16.0.1, 172.16.4.1;
option netbios-name-servers 172.16.0.1;
option netbios-node-type 8;

subnet 172.16.1.0 netmask 255.255.252.0 {
        range dynamic-bootp 172.16.3.0 172.16.2.254;
        option subnet-mask 255.255.252.0;
        option routers 172.16.0.1, 172.16.0.128;
        allow unknown-clients;
	}
subnet 172.16.4.0 netmask 255.255.252.0 {
        range dynamic-bootp 172.16.5.0 172.16.6.255;
        option subnet-mask 255.255.252.0;
        option routers 172.16.4.128;
        allow unknown-clients;
	}
subnet 127.0.0.0 netmask 255.0.0.0 {
        }
</screen>
</example>

<!-- Nine -->
<example id="bldg2dhcp">
<title>Server: BLDG2, File: dhcpd.conf</title>
<screen>
# Abmas Accounting Inc. - Chapter 5/BLDG1

default-lease-time 86400;
max-lease-time 172800;
default-lease-time 86400;
ddns-updates on;
ddns-update-style ad-hoc;

option ntp-servers 172.16.0.1;
option domain-name "abmas.biz";
option domain-name-servers 172.16.0.1, 172.16.4.1;
option netbios-name-servers 172.16.0.1;
option netbios-node-type 8;

subnet 172.16.8.0 netmask 255.255.252.0 {
        range dynamic-bootp 172.16.9.0 172.16.10.255;
        option subnet-mask 255.255.252.0;
        option routers 172.16.8.128;
        allow unknown-clients;
	}
subnet 127.0.0.0 netmask 255.0.0.0 {
        }
</screen>
</example>

<!-- Ten -->
<example id="massive-nameda">
<title>Server: MASSIVE, File: named.conf, Part: A</title>
<screen>
###
# Abmas Biz DNS Control File
###
# Date: November 15, 2003
###
options {
	directory "/var/lib/named";
	forwarders {
		123.45.12.23;
		123.45.54.32;
		};
	forward first;
	listen-on {
		mynet;
		};
	auth-nxdomain yes;
	multiple-cnames yes;
	notify no;
};

zone "." in {
	type hint;
	file "root.hint";
};

zone "localhost" in {
	type master;
	file "localhost.zone";
};

zone "0.0.127.in-addr.arpa" in {
	type master;
	file "127.0.0.zone";
};

acl mynet {
	172.16.0.0/24;
	172.16.4.0/24;
	172.16.8.0/24;
	127.0.0.1;
};

acl seconddns {
        123.45.54.32;
}
</screen>
</example>

<!-- Eleven -->
<example id="massive-namedb">
<title>Server: MASSIVE, File: named.conf, Part: B</title>
<screen>
zone "abmas.biz" {
	type master;
	file "/var/lib/named/master/abmas.biz.hosts";
	allow-query {
		mynet;
	};
	allow-transfer {
		mynet;
	};
	allow-update {
		mynet;
	};
};

zone "abmas.us" {
        type master;
        file "/var/lib/named/master/abmas.us.hosts";
        allow-query {
                all;
        };
        allow-transfer {
                seconddns;
        };
};
</screen>
</example>

<!-- Twelve -->
<example id="massive-namedc">
<title>Server: MASSIVE, File: named.conf, Part: C</title>
<screen>
zone "0.16.172.in-addr.arpa" {
	type master;
	file "/var/lib/named/master/172.16.0.0.rev";
	allow-query {
		mynet;
	};
	allow-transfer {
		mynet;
	};
	allow-update {
		mynet;
	};
};

zone "4.16.172.in-addr.arpa" {
	type master;
	file "/var/lib/named/master/172.16.4.0.rev";
	allow-query {
		mynet;
	};
	allow-transfer {
		mynet;
	};
	allow-update {
		mynet;
	};
};

zone "8.16.172.in-addr.arpa" {
	type master;
	file "/var/lib/named/master/172.16.8.0.rev";
	allow-query {
		mynet;
	};
	allow-transfer {
		mynet;
	};
	allow-update {
		mynet;
	};
};
</screen>
</example>

<!-- Thirteen -->
<example id="abmasbizdns">
<title>Forward Zone File: abmas.biz.hosts</title>
<screen>
$ORIGIN .
$TTL 38400	; 10 hours 40 minutes
abmas.biz	IN SOA	massive.abmas.biz. root.abmas.biz. (
				2003021833 ; serial
				10800      ; refresh (3 hours)
				3600       ; retry (1 hour)
				604800     ; expire (1 week)
				38400      ; minimum (10 hours 40 minutes)
				)
			NS	massive.abmas.biz.
			NS	bldg1.abmas.biz.
			NS	bldg2.abmas.biz.
			MX	10 massive.abmas.biz.
$ORIGIN abmas.biz.
massive			A	172.16.0.1
router0                 A       172.16.0.128
bldg1                   A       172.16.4.1
router4                 A       172.16.4.128
bldg2                   A       172.16.8.1
router8                 A       172.16.8.128
</screen>
</example>

<!-- Forteen -->
<example id="abmasusdns">
<title>Forward Zone File: abmas.biz.hosts</title>
<screen>
$ORIGIN .
$TTL 38400	; 10 hours 40 minutes
abmas.us	IN SOA	server.abmas.us. root.abmas.us. (
				2003021833 ; serial
				10800      ; refresh (3 hours)
				3600       ; retry (1 hour)
				604800     ; expire (1 week)
				38400      ; minimum (10 hours 40 minutes)
				)
			NS	dns.abmas.us.
			NS	dns2.abmas.us.
			MX	10 mail.abmas.us.
$ORIGIN abmas.us.
server			A	123.45.67.66
dns2			A	123.45.54.32
gw			A	123.45.67.65
www			CNAME	server
mail			CNAME	server
dns			CNAME	server
</screen>
</example>

<!-- Fifteen -->
<example id="bldg12nameda">
<title>Servers: BLDG1/BLDG2, File: named.conf, Part: A</title>
<screen>
###
# Abmas Biz DNS Control File
###
# Date: November 15, 2003
###
options {
	directory "/var/lib/named";
	forwarders {
		172.16.0.1;
		};
	forward first;
	listen-on {
		mynet;
		};
	auth-nxdomain yes;
	multiple-cnames yes;
	notify no;
};

zone "." in {
	type hint;
	file "root.hint";
};

zone "localhost" in {
	type master;
	file "localhost.zone";
};

zone "0.0.127.in-addr.arpa" in {
	type master;
	file "127.0.0.zone";
};

acl mynet {
	172.16.0.0/24;
	172.16.4.0/24;
	172.16.8.0/24;
	127.0.0.1;
};

acl seconddns {
        123.45.54.32;
}
</screen>
</example>

<!-- Sixteen -->
<example id="bldg12namedb">
<title>Servers: BLDG1/BLDG2, File: named.conf, Part: B</title>
<screen>
zone "abmas.biz" {
	type slave;
	file "/var/lib/named/slave/abmas.biz.hosts";
	allow-query {
		mynet;
	};
	allow-transfer {
		mynet;
	};
};

zone "0.16.172.in-addr.arpa" {
	type slave;
	file "/var/lib/slave/master/172.16.0.0.rev";
	allow-query {
		mynet;
	};
	allow-transfer {
		mynet;
	};
};

zone "4.16.172.in-addr.arpa" {
	type slave;
	file "/var/lib/named/slave/172.16.4.0.rev";
	allow-query {
		mynet;
	};
	allow-transfer {
		mynet;
	};
};

zone "8.16.172.in-addr.arpa" {
	type slave;
	file "/var/lib/named/slave/172.16.8.0.rev";
	allow-query {
		mynet;
	};
	allow-transfer {
		mynet;
	};
};
</screen>
</example>


<!-- Seventeen -->
<example id="ch5-initgrps">
<title>Initialize Groups Script, File: /etc/samba/initGrps.sh</title>
<screen>
#!/bin/bash

# Create UNIX groups
groupadd acctsdep
groupadd finsrvcs
groupadd piops

# Map Windows Domain Groups to UNIX groups
net groupmap modify ntgroup="Domain Admins"  unixgroup=root
net groupmap modify ntgroup="Domain Users"   unixgroup=users
net groupmap modify ntgroup="Domain Guests"  unixgroup=nobody

# Add Functional Domain Groups
net groupmap add ntgroup="Accounts Dept"       unixgroup=acctsdep type=d
net groupmap add ntgroup="Financial Services"  unixgroup=finsrvcs type=d
net groupmap add ntgroup="Insurance Group"     unixgroup=piops type=d
</screen>
</example>

<!-- End of Examples -->

        <sect2 id="ch5-procstart">
        <title>Process Startup Configuration</title>

        <para>
	  <indexterm><primary>chkconfig</primary></indexterm><indexterm>
	    <primary>daemon control</primary>
	  </indexterm>
        There are two essential steps to process startup configuration. A process
        must be configured so that it is automatically restarted each time the server
        is rebooted. This step involves use of the <command>chkconfig</command> tool that
        created appropriate symbolic links from the master daemon control file that is
        located in the <filename>/etc/rc.d</filename> directory to the <filename>/etc/rc'x'.d</filename>
        directories. Links are created so that when the system run-level is changed, the
        necessary start or kill script is run.
        </para>

        <para>
        <indexterm><primary>/etc/xinetd.d</primary></indexterm>
        In the event that a service is provided not as a daemon but via the internetworking
        super daemon (<command>inetd</command> or <command>xinetd</command>), then the <command>chkconfig</command>
        tool makes the necessary entries in the <filename>/etc/xinetd.d</filename> directory
        and sends a hang-up (HUP) signal to the super daemon, thus forcing it to
        re-read its control files.
        </para>

        <para>
        Last, each service must be started to permit system validation to proceed.
        </para>

        <procedure>
                <step><para>
                Use the standard system tool to configure each service to restart
                automatically at every system reboot. For example,
                <indexterm><primary>chkconfig</primary></indexterm>
<screen>
&rootprompt; chkconfig dhpc on
&rootprompt; chkconfig named on
&rootprompt; chkconfig cups on
&rootprompt; chkconfig smb on
&rootprompt; chkconfig swat on
</screen>
                </para></step>

                <step><para>
                <indexterm><primary>starting dhcpd</primary></indexterm>
                <indexterm><primary>starting samba</primary></indexterm>
                <indexterm><primary>starting CUPS</primary></indexterm>
                Now start each service to permit the system to be validated.
                Execute each of the following in the sequence shown:

<screen>
&rootprompt; service dhcp restart
&rootprompt; service named restart
&rootprompt; service cups restart
&rootprompt; service smb restart
&rootprompt; service swat restart
</screen>
                </para></step>
        </procedure>

        </sect2>

	<sect2 id="ch5wincfg">
	<title>Windows Client Configuration</title>

	<para>
	The procedure for desktop client configuration for the network in this chapter is similar to
	that used for the previous one. There are a few subtle changes that should be noted.
	</para>

	<procedure>
		<step><para>
		Install MS Windows XP Professional. During installation, configure the client to use DHCP for 
		TCP/IP protocol configuration.
		<indexterm><primary>WINS</primary></indexterm>
		<indexterm><primary>DHCP</primary></indexterm>
		DHCP configures all Windows clients to use the WINS Server address that has been defined
		for the local subnet.
		</para></step>

		<step><para>
		Join the Windows domain <constant>MEGANET</constant>. Use the domain administrator
		username <constant>root</constant> and the SMB password you assigned to this account.
		A detailed step-by-step procedure for joining a Windows 200x/XP Professional client to
		a Windows domain is given in Appendix A, <link linkend="domjoin"/>. 
		Reboot the machine as prompted and then log on using the domain administrator account
		(<constant>root</constant>).
		</para></step>

		<step><para>
		Verify that the server called <constant>MEGANET</constant> is visible in <guimenu>My Network Places</guimenu>, 
		that it is possible to connect to it and see the shares <guimenuitem>accounts</guimenuitem>,
		<guimenuitem>apps</guimenuitem>, and <guimenuitem>finsvcs</guimenuitem>,
		and that it is possible to open each share to reveal its contents.
		</para></step>

		<step><para>
		Create a drive mapping to the <constant>apps</constant> share on a server. At this time, it does
		not particularly matter which application server is used. It is necessary to manually
		set a persistent drive mapping to the local applications server on each workstation at the time of 
		installation. This step is avoided by the improvements to the design of the network configuration
		in the next chapter.
		</para></step>

		<step><para>
		Perform an administrative installation of each application to be used. Select the options
		that you wish to use. Of course, you choose to run applications over the network, correct?
		</para></step>

		<step><para>
		Now install all applications to be installed locally. Typical tools include Adobe Acrobat,
		NTP-based time synchronization software, drivers for specific local devices such as fingerprint
		scanners, and the like. Probably the most significant application to be locally installed
		is antivirus software.
		</para></step>

		<step><para>
		Now install all four printers onto the staging system. The printers you install
		include the accounting department HP LaserJet 6 and Minolta QMS Magicolor printers, and you
		also configure use of the identical printers that are located in the financial services department.
		Install printers on each machine using the following steps:

			<procedure>
				<step><para>
				Click <menuchoice>
					<guimenu>Start</guimenu>
					<guimenuitem>Settings</guimenuitem>
					<guimenuitem>Printers</guimenuitem>
					<guiicon>Add Printer</guiicon>
					<guibutton>Next</guibutton>
					</menuchoice>. Do not click <guimenuitem>Network printer</guimenuitem>.
					Ensure that <guimenuitem>Local printer</guimenuitem> is selected.
				</para></step>

				<step><para>
				Click <guibutton>Next</guibutton>. In the
				<guimenuitem>Manufacturer:</guimenuitem> panel, select <constant>HP</constant>.
				In the <guimenuitem>Printers:</guimenuitem> panel, select the printer called
				<constant>HP LaserJet 6</constant>. Click <guibutton>Next</guibutton>.
				</para></step>

				<step><para>
				In the <guimenuitem>Available ports:</guimenuitem> panel, select
				<constant>FILE:</constant>. Accept the default printer name by clicking
				<guibutton>Next</guibutton>. When asked, <quote>Would you like to print a
				test page?</quote>, click <guimenuitem>No</guimenuitem>. Click
				<guibutton>Finish</guibutton>.
				</para></step>

				<step><para>
				You may be prompted for the name of a file to print to. If so, close the
				dialog panel. Right-click <menuchoice>
					<guiicon>HP LaserJet 6</guiicon>
					<guimenuitem>Properties</guimenuitem>
					<guimenusub>Details (Tab)</guimenusub>
					<guimenubutton>Add Port</guimenubutton>
					</menuchoice>.
				</para></step>

				<step><para>
				In the <guimenuitem>Network</guimenuitem> panel, enter the name of
				the print queue on the Samba server as follows: <constant>\\BLDG1\hplj6a</constant>.
				Click <menuchoice> 
					<guibutton>OK</guibutton>
					<guibutton>OK</guibutton>
					</menuchoice> to complete the installation.
				</para></step>

				<step><para>
				Repeat the printer installation steps above for both HP LaserJet 6 printers
				as well as for both QMS Magicolor laser printers. Remember to install all
				printers but to set the destination port for each to the server on the
				local network. For example, a workstation in the accounting group should
				have all printers directed at the server <constant>BLDG1</constant>.
				You may elect to point all desktop workstation configurations at the
				server called <constant>MASSIVE</constant> and then in your deployment	
				procedures, it would be wise to document the need to redirect the printer
				configuration (as well as the applications server drive mapping) to the
				server on the network segment on which the workstation is to be located.
				</para></step>
			</procedure>
		</para></step>

		<step><para>
		When you are satisfied that the staging systems are complete, use the appropriate procedure to
		remove the client from the domain. Reboot the system, and then log on as the local administrator
		and clean out all temporary files stored on the system. Before shutting down, use the disk
		defragmentation tool so that the file system is in optimal condition before replication.
		</para></step>

		<step><para>
		Boot the workstation using the Norton (Symantec) Ghosting disk (or CD-ROM) and image the
		machine to a network share on the server.
		</para></step>

		<step><para>
		You may now replicate the image using the appropriate Norton Ghost procedure to the target
		machines. Make sure to use the procedure that ensures each machine has a unique
		Windows security identifier (SID). When the installation of the disk image is complete, boot the PC. 
		</para></step>

		<step><para>
		Log onto the machine as the local Administrator (the only option), and join the machine to
		the domain following the procedure set out in Appendix A, <link linkend="domjoin"/>. You must now set the 
		persistent drive mapping to the applications server that the user is to use. The system is now 
		ready for the user to log on, provided you have created a network logon account for that 
		user, of course.
		</para></step>

		<step><para>
		Instruct all users to log onto the workstation using their assigned username and password.
		</para></step>
	</procedure>

	</sect2>

	<sect2>
		<title>Key Points Learned</title>

		<para>
		The network you have just deployed has been a valuable exercise in forced constraint.
		You have deployed a network that works well, although you may soon start to see
		performance problems, at which time the modifications demonstrated in
		Chapter 5 bring the network to life. The following key learning points were experienced:
		</para>

		<itemizedlist>
			<listitem><para>
			The power of using &smb.conf; include files
			</para></listitem>

			<listitem><para>
			Use of a single PDC over a routed network
			</para></listitem>

			<listitem><para>
			Joining a Samba-3 domain member server to a Samba-3 domain
			</para></listitem>

			<listitem><para>
			Configuration of winbind to use domain users and groups for Samba access
			to resources on the domain member servers
			</para></listitem>

			<listitem><para>
			The introduction of roaming profiles
			</para></listitem>

		</itemizedlist>

	</sect2>

</sect1>

<sect1>
	<title>Questions and Answers</title>

	<para>
	</para>

	<qandaset defaultlabel="chap01qa" type="number">
	<qandaentry>
	<question>

		<para>
		The example &smb.conf; files in this chapter make use of the <parameter>include</parameter> facility.
		How may I get to see what the actual working &smb.conf; settings are?
		</para>

	</question>
	<answer>

		<para>
		You may readily see the net compound effect of the included files by running:
<screen>
&rootprompt; testparm -s | less
</screen>
		</para>

	</answer>
	</qandaentry>

	<qandaentry>
	<question>

		<para>
		Why does the include file <filename>common.conf</filename> have an empty include statement?
		</para>

	</question>
	<answer>

		<para>
		The use of the empty include statement nullifies further includes. For example, let's say you 
		desire to have just an smb.conf file that is built from the array of include files of which the
		master control file is called <filename>master.conf</filename>. The following command 
		produces a compound &smb.conf; file.
<screen>
&rootprompt; testparm -s /etc/samba/master.conf > /etc/samba/smb.conf
</screen>
		If the include parameter was not in the common.conf file, the final &smb.conf; file leaves
		the include in place, even though the file it points to has already been included. This is a bug
		that will be fixed at a future date.
		</para>

	</answer>
	</qandaentry>

	<qandaentry>
	<question>

		<para>
		I accept that the simplest configuration necessary to do the job is the best. The use of <parameter>tdbsam</parameter>
		passdb backend is much simpler than having to manage an LDAP-based <parameter>ldapsam</parameter> passdb backend.
		I tried using <command>rsync</command> to replicate the <filename>passdb.tdb</filename>, and it seems to work fine!
		So what is the problem?
		</para>

	</question>
	<answer>

		<para>
		Replication of the <parameter>tdbsam</parameter> database file can result in loss of currency in its
		contents between the PDC and BDCs. The most notable symptom is that workstations may not be able
		to log onto the network following a reboot and may have to rejoin the domain to recover network
		access capability.
		</para>

	</answer>
	</qandaentry>

	<qandaentry>
	<question>

		<para>
		You are using DHCP Relay enabled on the routers as well as a local DHCP server. Will this cause a clash?
		</para>

	</question>
	<answer>

		<para>
		No. It is possible to have as many DHCP servers on a network segment as makes sense. A DHCP server
		offers an IP address lease, but it is the client that determines which offer is accepted, no matter how many
		offers are made. Under normal operation, the client accepts the first offer it receives.
		</para>

		<para>
		The only exception to this rule is when the client makes a directed request from a specific DHCP server
		for renewal of the lease it has. This means that under normal circumstances there is no risk of a clash.
		</para>

	</answer>
	</qandaentry>

	<qandaentry>
	<question>

		<para>
		How does the Windows client find the PDC?
		</para>

	</question>
	<answer>

		<para>
		The Windows client obtains the WINS server address from the DHCP lease information. It also
		obtains from the DHCP lease information the parameter that causes it to use directed UDP (UDP Unicast)
		to register itself with the WINS server and to obtain enumeration of vital network information to 
		enable it to operate successfully.
		</para>

	</answer>
	</qandaentry>

	<qandaentry>
	<question>

		<para>
		Why did you enable IP forwarding (routing) only on the server called <constant>MASSIVE</constant>?
		</para>

	</question>
	<answer>

		<para>
		The server called <constant>MASSIVE</constant> is acting as a router to the Internet. No other server
		(BLDG1 or BLDG2) has any need for IP forwarding because they are attached only to their own network.
		Route table entries are needed to direct MASSIVE to send all traffic intended for the remote network
		segments to the router that is its gateway to them.
		</para>

	</answer>
	</qandaentry>

	<qandaentry>
	<question>

		<para>
		You did nothing special to implement roaming profiles. Why?
		</para>

	</question>
	<answer>

		<para>
		Unless configured to do otherwise, the default behavior with Samba-3 and Windows XP Professional
		clients is to use roaming profiles.
		</para>

	</answer>
	</qandaentry>

	<qandaentry>
	<question>

		<para>
		On the domain member computers, you configured winbind in the <filename>/etc/nsswitch.conf</filename> file.
		You did not configure any PAM settings. Is this an omission?
		</para>

	</question>
	<answer>

		<para>
		PAM is needed only for authentication. When Samba is using Microsoft encrypted passwords, it makes only
		marginal use of PAM. PAM configuration handles only authentication. If you want to log onto the domain
		member servers using Windows networking usernames and passwords, it is necessary to configure PAM
		to enable the use of winbind. Samba makes use only of the identity resolution facilities of the name
		service switch (NSS).
		</para>

	</answer>
	</qandaentry>

	<qandaentry>
	<question>

		<para>
		You are starting SWAT up on this example but have not discussed that anywhere. Why did you do this?
		</para>

	</question>
	<answer>

		<para>
		Oh, I did not think you would notice that. It is there so that it can be used. This is more fully discussed
		in <emphasis>TOSHARG</emphasis>, which has a full chapter dedicated to the subject. While we are on the 
		subject, it should be noted that you should definitely not use SWAT on any system that makes use 
		of &smb.conf; <parameter>include</parameter> files because SWAT optimizes them out into an aggregated 
		file but leaves in place a broken reference to the top-layer include file. SWAT was not designed to 
		handle this functionality gracefully.
		</para>

	</answer>
	</qandaentry>

	<qandaentry>
	<question>

		<para>
		The domain controller has an auto-shutdown script. Isn't that dangerous?
		</para>

	</question>
	<answer>

		<para>
		Well done, you spotted that! I guess it is dangerous. It is good to know that you can do this, though.
		</para>

	</answer>
	</qandaentry>

	</qandaset>

</sect1>

</chapter>