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Wednesday 31 August 2005

Use the NIS and NFS Infrastructure on Red Hat Advanced Server 2.1

By Julien Gabel on Wednesday 31 August 2005, 22:20 - GNU/Linux

Here are the steps to be able to use the current NIS and NFS infrastructure from a Linux server.

NIS

Be sure to resolve the NIS servers (slave and/or master) for the int domain name:

# egrep "nasty|bigup" /etc/hosts
192.168.4.74           nasty
192.168.4.23           bigup

Configure the NIS client:

# cat << EOF >> /etc/yp.conf
domain int server nasty
domain int server nasty
EOF
# grep NIS /etc/sysconfig/authconfig /etc/sysconfig/network
/etc/sysconfig/authconfig:USENIS=yes
/etc/sysconfig/network:NISDOMAIN=int

NFS

The NFS part is relatively simple since the autofs maps is looked up in the NIS maps (already managed by the corresponding boot script's service).

So, it is just needed to modify the automountd service to add some arguments that must be passed to the program. This is a necessary step to be able to automount the correct remote path using our customized autofs server. Here is how to do so.

Check the configuration of the run-level informations for the autofs service:

# chkconfig --list autofs
autofs          0:off   1:off   2:off   3:on    4:on    5:on    6:off

Modify the initial service configuration and reload it:

# diff -u /etc/init.d/autofs.orig /etc/init.d/autofs
--- /etc/init.d/autofs.orig     Thu Aug 25 13:12:38 2005
+++ /etc/init.d/autofs  Thu Aug 25 17:25:47 2005
@@ -67,7 +67,10 @@
 # We can add local options here
 # e.g. localoptions='rsize=8192,wsize=8192'
 #
-localoptions=''
+localoptions="-DOSNAME=`uname -s` \
+              -DCPU=x86 \
+              -DNATISA=32 \
+              -DOSREL=`uname -r | awk -F\. '{print $1\".\"$2}'`"
 
 # Daemon options
 # e.g. --timeout 60
# service autofs restart

Verify if all is ok:

# service autofs status
Configured Mount Points:
------------------------
/usr/sbin/automount /Soft yp auto.soft -ro,hard,bg,intr -DOSNAME=Linux        -DCPU=x86        -DNATISA=32        -DOSREL=2.4
/usr/sbin/automount /NTFS yp auto.nt  -DOSNAME=Linux        -DCPU=x86        -DNATISA=32        -DOSREL=2.4
/usr/sbin/automount /Home yp auto.home -rw,hard,bg,intr -DOSNAME=Linux        -DCPU=x86        -DNATISA=32        -DOSREL=2.4
/usr/sbin/automount /Apps yp auto.apps -ro,hard,bg,intr -DOSNAME=Linux        -DCPU=x86        -DNATISA=32        -DOSREL=2.4
/usr/sbin/automount /- yp auto.direct  -DOSNAME=Linux        -DCPU=x86        -DNATISA=32        -DOSREL=2.4

Active Mount Points:
--------------------
/usr/sbin/automount /Soft yp auto.soft -ro,hard,bg,intr -DOSNAME=Linux -DCPU=x86 -DNATISA=32 -DOSREL=2.4
/usr/sbin/automount /NTFS yp auto.nt -DOSNAME=Linux -DCPU=x86 -DNATISA=32 -DOSREL=2.4
/usr/sbin/automount /Home yp auto.home -rw,hard,bg,intr -DOSNAME=Linux -DCPU=x86 -DNATISA=32 -DOSREL=2.4
/usr/sbin/automount /Apps yp auto.apps -ro,hard,bg,intr -DOSNAME=Linux -DCPU=x86 -DNATISA=32 -DOSREL=2.4
/usr/sbin/automount /- yp auto.direct -DOSNAME=Linux -DCPU=x86 -DNATISA=32 -DOSREL=2.4

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Saturday 18 June 2005

Use the NIS and NFS Infrastructure on AIX 5L

By Julien Gabel on Saturday 18 June 2005, 11:39 - AIX

Here are the steps to be able to use the current NIS and NFS infrastructure from an AIX server:

# cat /etc/resolv.conf  
domain          dev.example.com
nameserver      10.239.208.24
nameserver      10.251.140.96
search          dev.example.com int.example.com prod.example.com
#
# TERM=vt220 smitty
/*
 * Communications Applications and Services
 *  TCP/IP
 *   Further Configuration
 *    Name Resolution
 *     Hosts Table (/etc/hosts)
 *      Add a Host
 *       INTERNET ADDRESS (dotted decimal)               [10.254.234.22]
 *       HOST NAME                                       [neptune.dev.example.com]
 *       ALIAS(ES) (if any - separated by blank space)   [neptune]
 *       COMMENT (if any - for the host entry)           [NIS server for domain devex]
 *  NFS
 *   Network Information Service (NIS)
 *    Configure / Modify NIS
 *     Change NIS Domain Name of this Host
 *      Domain name of this host                        [devex]
 *     Configure this Host as a NIS Client
 *      NIS server - required if there are              [neptune]
 *   Network File System (NFS)
 *    Configure NFS on This System
 *     Start Automounter
 *      PARAMETERS to be used for the automount daemon  [-n]
 */

Launch the automountd at run-level #2:

# cat << EOF > /etc/rc.d/rc2.d/Sautomountd
#!/usr/bin/env ksh
#################################################################
# name: {K|S}automountd
# purpose: script that will start or stop the automountd service.
#################################################################

case "$1" in
start)
  /usr/sbin/automount -n
  ;;
stop)
  stopsrc -g autofs
  ;;
*)
  echo "Usage: $0 {start|stop}"
  exit 1
esac

exit 0
EOF
# ln /etc/rc.d/rc2.d/Sautomountd /etc/rc.d/rc2.d/Kautomountd
# chmod 754 /etc/rc.d/rc2.d/?automountd

In the same time, modify the automountd service to add some arguments that must be passed to the program. This is a necessary step to be able to automount the correct remote path using our customized autofs server. Here is how to do so:

# chssys -s automountd -a "-DOSNAME=`uname -s` -DCPU=`uname -p` -DNATISA=`bootinfo -K` -DOSREL=`uname -v`.`uname -r`"
# stopsrc -g autofs
# /usr/sbin/automount -n

Very important

To resolve information correctly, it was needed to explicitly specify the ordering of name resolution and hosts setting in /etc/netsvc.conf. This file corresponds to /etc/nsswitch.conf under Solaris, GNU/Linux or the BSDs for hosts name resolution. For example:

# cat << EOF >> /etc/netsvc.conf
hosts = local, nis, bind
EOF

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