Differences between revisions 13 and 14
Revision 13 as of 2010-02-07 22:53:03
Size: 3453
Editor: ?JeromeAvond
Comment:
Revision 14 as of 2010-04-07 12:21:11
Size: 3640
Comment:
Deletions are marked like this. Additions are marked like this.
Line 57: Line 57:
Please understand that this script is '''dangerous'''. You should check if all the files listed by ''grep -rl "$ancien" /etc'' must really be modified '''before''' launching this script
Line 102: Line 103:
   [ -f $file ] && sed -i.old -e 's:$ancien:$nouveau:g' $file    [ -f $file ] && sed -i.old -e "s:$ancien:$nouveau:g" $file

This page explains how to change a system's hostname (i.e rename a computer/server)

Executive summary: hostname(1) isn't enough.

Rename a computer

Core networking

  • Update /etc/hostname

  • Update /etc/hosts, so local address(es) resolves with the new system name.

  • Reload the network configuration. You have two options
    • Reload configuration files
      <!> This will temporarily disconnect your system from the network (ssh usually resists short disconnection)

      invoke-rc.d hostname.sh start
      invoke-rc.d networking force-reload
      invoke-rc.d network-manager force-reload

      ToDo: is it useful to reload network-manager?

    • or the lazy way: Restart the system.

Application specific

avahi

Avahi is used to publish (announce) local services. If you tweaked /etc/avahi/* you should run:

  • invoke-rc.d avahi-daemon force-reload

ssmtp

Ssmtp is a light weight, send-only smtp server.

Adjust /etc/ssmtp/ssmtp.conf (hostname=, etc.). You don't need to restart the service.

Exim

Adjust /etc/exim4/update-exim4.conf.conf (hostname=). You need to restart the service.

Message Of The Day

Adjust /etc/motd. You don't need to restart a service.

Cups

Adjust /etc/printcap . You need to restart the service.

Mailname

Adjust /etc/mailname. You don't need to restart the service.

Openssh server

Adjust /etc/ssh/ssh_host_rsa_key.pub and /etc/ssh/ssh_host_dsa_key.pub (root@hostname at the end). You need to restart the service.

other

  • (to be written) there must be others...

    Charlie: It was me who took you. Not the Others...

Idea of script to help you on

Intrusive script

Please understand that this script is dangerous. You should check if all the files listed by grep -rl "$ancien" /etc must really be modified before launching this script

   1 #!/bin/bash
   2 #
   3 usage() {
   4    echo "usage : $0 nouveau_nom_hote"
   5    exit 1
   6 }
   7 
   8 [ -z $1 ] && usage
   9 
  10 ancien=`hostname`
  11 nouveau=$1
  12 
  13 grep $ancien /etc/ -rl 2>/dev/null | while read file
  14    do
  15       sed s:$ancien:$nouveau:g $file > ${file}.tmp
  16       mv ${file}.tmp $file
  17    done

Take care you'd better do a grep before...

Not-so intrusive script

#!/bin/bash
# 
usage() {
   echo "usage : $0 nouveau_nom_hote"
   exit 1
}

[ -z $1 ] && usage

ancien=`hostname`
nouveau=$1

for file in \
   /etc/exim4/update-exim4.conf.conf \
   /etc/printcap \
   /etc/hostname \
   /etc/hosts \
   /etc/ssh/ssh_host_rsa_key.pub \
   /etc/ssh/ssh_host_dsa_key.pub \
   /etc/motd \
   /etc/ssmtp/ssmtp.conf
do
   [ -f $file ] && sed -i.old -e "s:$ancien:$nouveau:g" $file
done

Take care you'd better do a grep before...


See also