Version 5 (modified by 12 years ago) (diff) | ,
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This page documents the steps to take in decommissioning a kvm guest.
Make sure any needed data is backed up.
The steps below assume that nothing needs to be preserved from the server. If something does need to be preserved, copy the data to another location before following these steps.
Shutting down the guest
We need the machine to be out of service so that we can wipe any sensitive data from the disks. In order to shutdown a guest so that it will not reboot, you'll need to be root@HOSTNAME.mayfirst.org
. From the host, issue the command:
# update-service --remove /etc/sv/kvm/GUESTNAME
This command will shutdown the virtual machine. We need the machine to be out of service so that we can wipe any sensitive data from the disks.
Removing the guest directory
To ensure that the guest will not come back online, ever, you should remove the guest kvm directory with the following command as root@HOSTNAME.mayfirst.org
:
# rm -rf /etc/sv/kvm/GUESTNAME
Ensure all sensitive data is overwritten
For this step, login as GUESTNAME@HOSTNAME.mayfirst.org
to ensure that you do not overwrite data for other guests. Here we'll issue a dd command that writes zeros across the entire logical volume. The command is:
$ dd if=/dev/zero of=/dev/mapper/VOLUMEGROUPNAME-LOGICALVOLUMENAME bs=1M
A real world example would be:
0 bataille@ken:~$ dd if=/dev/zero of=/dev/mapper/vg_ken0-bataille bs=1M dd: writing `/dev/mapper/vg_ken0-bataille': No space left on device 10001+0 records in 10000+0 records out 10485760000 bytes (10 GB) copied, 500.62382 s, 18.6 MB/s 1 bataille@ken:~$
Once this command finishes running, you can return the logical volume to the volume group.
Removing a Logical Volume
From root@HOSTNAME.mayfirst.org
check the volume group with:
# vgs
This should give output that looks like this:
0 ken:/dev# vgs VG #PV #LV #SN Attr VSize VFree vg_ken0 1 15 0 wz--n- 1.82t 1.10t 0 ken:/dev#
Now you can remove the logical volume with the following command:
# lvremove VOLUMEGROUPNAME/LOGICALVOLUMENAME
Real world example:
0 ken:/dev# lvremove vg_ken0/bataille Do you really want to remove active logical volume bataille? [y/n]: y Logical volume "bataille" successfully removed 0 ken:/dev#
Now run 'vgs' again and make sure the new disk space has been added back to the volume group. You should see an increase in the 'VFree' column of the output of the 'vgs' command.
Removing the guest user
# deluser --remove-home GUESTNAME
Clean up on helper servers
On jojobe.mayfirst.org (nagios server), check for and delete:
/etc/nagios3/conf.d/nodes/GUESTNAME.cfg
On the designated backup servers (should be designated in puppet file if it exists):
deluser --remove-home GUESTNAME-sync
On your own workstation in the MFPL puppet git repo:
git rm manifests/nodes/production/GUESTNAME.pp git commit -m "decomissioning GUESTNAME"
Delete node from http://servers.mayfirst.org/
You've now decommissioned a server!