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Linux Professional Institute Certiﬁcation — 102

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Context

Topic 113 Networking Services [24] 1.113.1 Conﬁgure and manage inetd, xinetd, and related services [4] 1.113.2 Operate and perform basic conﬁguration of sendmail [4] 1.113.3 Operate and perform basic conﬁguration of Apache [4] 1.113.4 Properly manage the NFS, smb, and nmb daemons [4] 1.113.5 Setup and conﬁgure basic DNS services [4] 1.113.7 Set up secure shell (OpenSSH) [4]

Andrew Eager andrew.eager@aes-pl.com.au Geoffrey Robertson ge@ffrey.com Nick Urbanik nicku@nicku.org
This document Licensed under GPL—see section 7

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Objectives

2005 July
Outline

Description of Objective Candidate should know how to mount remote ﬁlesystems using NFS, conﬁgure NFS for exporting local ﬁlesystems, start, stop, and restart the NFS server. Install and conﬁgure Samba using the included GUI tools or direct edit of the /etc/smb.conf ﬁle (Note: this deliberately excludes advanced NT domain issues but includes simple sharing of home directories and printers, as well as correctly setting the nmbd as a WINS client). Key ﬁles, terms, and utilities include: 2 2 2 3 3 3 3 4 4 4 4 4 /etc/exports /etc/fstab /etc/smb.conf mount umount

Contents
1 2 3 4 Context Objectives Resources NFS 4.1 About NFS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2 NFS on client . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.3 NFS: server conﬁguration . . . . . . . . . . . . . . . . . . . . . . . . . . . Samba 5.1 About Samba . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . smb.conf 6.1 smb.conf sections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.2 Web conﬁguration with swat . . . . . . . . . . . . . . . . . . . . . . . . .

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Resources

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Properly manage the NFS, smb, and nmb daemons NFS: http://nfs.sourceforge.net/ Samba: http://au1.samba.org/samba/docs/ • Especially important are the two online books:

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– http://au1.samba.org/samba/docs/man/Samba3-HOWTO/, and – http://au1.samba.org/samba/docs/man/Samba3-ByExample/

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NFS

NFS

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Samba

4.1 About NFS

5.1 About Samba
Samba • Implementation of Windows networking protocols (SMB/CIFS, NMB) for Unix • Samba version 3 (just released) gives PDC/BDC functionality, NT4 domain member support, much improved printing, etc • Full suite of tools, including smbd and nmbd daemons, but also client tools: smbclient, rpcclient, net, smbstatus, nmblookup, smbtar, smbspool, etc

• “Network File System” • Extremely widely used protocol for sharing ﬁles between Unix machines • Built over RPC • Almost always uses UDP • Unlike alternatives, the NFS protocol is stateless—the server can reboot and the client carries on • NFSv2 is very simple; v3 is an evolution of v2; v4 is complex (and stateful)

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smb.conf

4.2 NFS on client
NFS mount -o options server:/path /mnt_point
# typical /etc/fstab line - see nfs(5) server:/exports/home /home nfs rw,intr,rsize=8192,wsize=8192

Samba Conﬁgured through /etc/samba/smb.conf win.ini-esque sections describing shares [public] comment = Public files path = /home/ftp/pub read only = yes guest ok = yes Various %X string substitutions available (see smb.conf(5))

Some options: rsize/wsize Read/write size intr Allow signals to interrupt timed-out operations soft Don’t retry indeﬁnitely

6.1 smb.conf sections
Samba [global] Global conﬁguration

4.3 NFS: server conﬁguration
NFS /etc/exports controls what gets exported to where # /etc/exports. See exports(5) /home 10.0.128.0/24(rw,no_root_squash) /cdrom *(ro,all_squash) Information is actually communicated to mountd and kernel NFS server via exportfs(8) Note: No whitespace is allowed between client and client options (showmount(8) will query this information from a server)

[homes] Triggers creation of automatic user home directory shares [printers] Triggers creation of printer shares for each system printer

6.2 Web conﬁguration with swat
Samba • “Samba Web Administration Tool” • Usual install is http://localhost:901/

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• Easy to use, links to relevant documentation, etc. • Rewrites smb.conf, loses comments, reorders and destroys hand crafted directives such as include

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License Of This Document

License Of This Document Copyright c 2005, 2003 Andrew Eager <andrew.eager@aes-pl.com.au>, Geoffrey Robertson <ge@ffrey.com> and Nick Urbanik <nicku@nicku.org>. Permission is granted to make and distribute verbatim copies or modiﬁed versions of this document provided that this copyright notice and this permission notice are preserved on all copies under the terms of the GNU General Public License as published by the Free Software Foundation—either version 2 of the License or (at your option) any later version.