= Infrastructure Host Rename SOP

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

== Contents

* <<_introduction>>
* <<_finding_out_where_the_host_is>>
* <<_preparation>>
* <<_renaming_the_logical_volume>>
* <<_doing_the_actual_rename>>
* <<_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
xref:infra-retiremachine.adoc[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