Red Hat Enterprise Linux 3: System Administration Guide
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# 9.7. Post-installation Script

You have the option of adding commands to run on the system once the installation is complete. This section must be at the end of the kickstart file and must start with the `%post` command. This section is useful for functions such as installing additional software and configuring an additional nameserver.

| Note

If you configured the network with static IP information, including a nameserver, you can access the network and resolve IP addresses in the `%post` section. If you configured the network for DHCP, the `/etc/resolv.conf` file has not been completed when the installation executes the `%post` section. You can access the network, but you can not resolve IP addresses. Thus, if you are using DHCP, you must specify IP addresses in the `%post` section.

| Note
| The post-install script is run in a chroot environment; therefore, performing tasks such as copying scripts or RPMs from the installation media will not work.

`--nochroot`

  Allows you to specify commands that you would like to run outside of the chroot environment.

  The following example copies the file `/etc/resolv.conf` to the file system that was just installed.

      %post --nochroot
      cp /etc/resolv.conf /mnt/sysimage/etc/resolv.conf

`--interpreter `/usr/bin/python``

  Allows you to specify a different scripting language, such as Python. Replace `/usr/bin/python` with the scripting language of your choice.

## 9.7.1. Examples

Turn services on and off:

    /sbin/chkconfig --level 345 telnet off
    /sbin/chkconfig --level 345 finger off
    /sbin/chkconfig --level 345 lpd off
    /sbin/chkconfig --level 345 httpd on

Run a script named `runme` from an NFS share:

    mkdir /mnt/temp
    mount 10.10.0.2:/usr/new-machines /mnt/temp
    open -s -w -- /mnt/temp/runme
    umount /mnt/temp

Add a user to the system:

    /usr/sbin/useradd bob
    /usr/bin/chfn -f "Bob Smith" bob
    /usr/sbin/usermod -p 'kjdf$04930FTH/ ' bob

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