– General Linux 2 – Properly manage the NFS, smb, and nmb daemons
(Linux Professional Institute Certification)

Copyright c 2003 Angus Lees. 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. $Id: gl2.113.4.slides.tex,v 1.2 2003/12/01 12:26:07 waratah Exp $

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Properly manage the NFS, smb and nmbs daemons
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).

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Properly manage the NFS, smb, and nmb daemons
Key files, terms and utilities
/etc/exports /etc/fstab /etc/smb.conf mount umount

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Properly manage the NFS, smb, and nmb daemons
Resources
NFS: http://nfs.sourceforge.net/

Samba:

http://au1.samba.org/samba/docs/
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NFS
About
• “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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NFS
Client-side usage
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

Some options: rsize/wsize Read/write size intr Allow signals to interrupt timed-out operations soft Don’t retry indefinitely
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NFS
Server-side configuration
/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)
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Samba
About
• 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

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Samba
smb.conf
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))

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Samba
smb.conf – Special sections
[global] Global configuration [homes] Triggers creation of automatic user home directory shares [printers] Triggers creation of printer shares for each system printer

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Samba
SWAT
“Samba Web Administration Tool” Usual install is http://localhost:901/ Easy to use, links to relevant documentation, etc. Rewrites smb.conf, loses comments, reorders and destroys hand crafted include, etc directives.

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