= Infrastructure Host Rename SOP

This page is intended to guide you through the process of renaming a
virtual node.

== Contents

[arabic]
. Introduction
. Finding out where the host is
. Preparation
. Renaming the Logical Volume
. Doing the actual rename
. Telling ansible about the new host
. VPN Stuff

== Introduction

Throughout this SOP, we will refer to the old hostname as $oldhostname
and the new hostname as $newhostname. We will refer to the Dom0 host
that the vm resides on as $vmhost.

If this process is being followed so that a temporary-named host can
replace a production host, please be sure to follow the
[51]Infrastructure retire machine SOP to properly decommission the old
host before continuing.

== Finding out where the host is

In order to rename the host, you must have access to the Dom0 (host) on
which the virtual server resides. To find out which host that is, log in
to batcave01, and run:

....
grep $oldhostname /var/log/virthost-lists.out
....

The first column of the output will be the Dom0 of the virtual node.

== Preparation

SSH to $oldhostname. If the new name is replacing a production box,
change the IP Address that it binds to, in
`/etc/sysconfig/network-scripts/ifcfg-eth0`.

Also change the hostname in `/etc/sysconfig/network`.

At this point, you can `sudo poweroff` $oldhostname.

Open an ssh session to $vmhost, and make sure that the node is listed as
`shut off`. If it is not, you can force it off with:

....
virsh destroy $oldhostname
....

== Renaming the Logical Volume

Find out the name of the logical volume (on $vmhost):

....
virsh dumpxml $oldhostname | grep 'source dev'
....

This will give you a line that looks like
`<source dev='/dev/VolGroup00/$oldhostname'/>` which tells you that
`/dev/VolGroup00/$oldhostname` is the path to the logical volume.

Run `/usr/sbin/lvrename` (the path that you found above) (the path that
you found above, with $newhostname at the end instead of $oldhostname)`

For example::::
  /usr/sbin/lvrename /dev/VolGroup00/noc03-tmp /dev/VolGroup00/noc01

== Doing the actual rename

Now that the logical volume has been renamed, we can rename the host in
libvirt.

Dump the configuration of $oldhostname into an xml file, by running:

....
virsh dumpxml $oldhostname > $newhostname.xml
....

Open up $newhostname.xml, and change all instances of $oldhostname to
$newhostname.

Save the file and run:

....
virsh define $newhostname.xml
....

If there are no errors above, you can undefine $oldhostname:

....
virsh undefine $oldhostname
....

Power on $newhostname, with:

....
virsh start $newhostname
....

And remember to set it to autostart:

....
virsh autostart $newhostname
....

== VPN Stuff

TODO