Old 8th May 2009, 20:49
je44ery je44ery is offline
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Default Preparing for FQDN change

I cross-posted this in one other popular forum on another site, and hopefully that is not too much.

I'm preparing to implement a FQDN change. We're going from short_name.example.com to short_name.xyz.example.com.

DNS is already taken care of. I'm not concerned with that part. I'm concerned with local changes.

The boxes are running RHEL ES 4 and RHEL ES 3.

Here is my plan so far.


Files I need to modify or at least check that they will still make sense.
  • /etc/hosts (We have lots of friendly names that are only avail in the hosts file).
  • /etc/sysconfig/network
  • /etc/resolv.conf
  • /etc/nsswitch.conf


Actions I take after all the files are in place.
  • Run *hostname* to change name.
  • SIGHUP sendmail.
  • On Apache httpd, see if ServerName is inherited from hostname somehow and its effects.
  • Anything on Apache Tomcat to do?
  • Reboot, maybe or definitely?


Post-implementation checks.
  • hostname output
  • hostname -s output.
  • domainname output.
  • Oddness in /var/log files.
  • Check user mail for reported problems.
  • Any other way to detect cron job failure?
  • No Nagios alerts.
  • Ensure Nagios alerts can still be sent!
  • Test user functionality of site.
  • Apache httpd log complaining?
  • Tomcat log complaining?
  • How to check db connectivity?

Thoughts? What am I forgetting? Where will I get bit in the ass?

Thanks, All, and cheers!
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Old 9th May 2009, 15:18
falko falko is offline
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Looks good. Make sure that you adjust the ServerName and/or ServerAlias lines in your Apache configuration?
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