You hope that you won’t ever need to, but you may one day need to run fsck on a Linux XenServer VM that won’t boot.. no worries, attach the storage from that VM on another VM and run it from there!
Let’s set it up with VM1 and VM2, where VM1 is the one that you need to run a manual fsck on.
1. Shut down VM1 (if it’s not down already..)
2. Enter the console on the xenserver and list the VMs – grab the vm-uuid of VM2.
|
1 |
xe vm-list |
3. Now get the vdi-uuid of the vdi you want to access:
|
1 |
xe vbd-list vm-name-label=VM1 |
4. Create the vbd – it will echo the vbd-uuid after this command:
|
1 |
xe vbd-create vm-uuid=VM-UUID vdi-uuid=VDI-UUID device=autodetect |
5. Now, ‘plug’ it in to VM1
|
1 |
xe vbd-plug uuid=VBD-UUID |
You should now see a new partition in /proc/partitions
When you’re done with it, unplug the vbd:
|
1 |
xe vbd-unplug uuid=VBD-UUID[ |
Then you can destroy the temporary vbd:
|
1 |
xe vbd-destroy uuid=VBD-UUID |
Added 3/24/2014:
If you’re trying to run fsck on an LVM volume, then you’ll need to activate it first, otherwise you’ll get a bad superblock error.. and it won’t fsck correctly.
First, find out what the name is for your lvm’s volume group:
|
1 |
lvm vgscan |
Next, activate it:
|
1 |
lvm lvchange -ay /dev/VolGroup00/LogVol00 |
Next, run fsck on it, automatically fixing the errors:
|
1 |
e2fsck -y /dev/VolGroup00/LogVol00 |
When finished, deactivate it:
|
1 |
lvm lvchange -an /dev/VolGroup00/LogVol00 |
Related posts from Linux Brigade!
Install XenServer via usb flash drive USB Flash drives are getting cheaper and cheaper lately. I just picked up few at staples – 16GB flash drives for just under $8. I like to use them to install Linux – I always seem to […]- Install nrpe on XenServer If you are using nagios in your hosting environment and need to install nrpe on your XenServer servers, here’s a good way to do it.
I’m using XenServer 6.1 (latest version).First, […]
Back up all of your mysql databases nightly Have you ever wanted to make your own MySQL database backups? You can use this script I wrote to make a backup of all databases, then save each one in a dated backup directory. It will […]
Valve’s Steambox will help Linux gaming If you’re a gamer, then you’ve heard of the steambox. This is Valve’s answer to the xbox, ouya, etc.. offering gaming in your living room.
They’ll be announcing something today at 10am […]
Globally disable directory listing on WHM/cPanel One of the things that WHM/cPanel servers have on by default is directory listing. This is something you don’t want – but it’s easy to fix!
1. Log into WHM
2. Apache Configuration […]
Great and detailed guide, thanks! As you said I hope I won’t ever need to do this but if I do I have bookmarked this post just incase.
Yes! This is another one for my server maintenance cheat sheet. Unfortunately, Murphy’s Law is a very active part of my life, so I appreciate having this resource for “just in case”. Thanks!
When I do the listing, I see 2, one saying device: hda and the other devide: hdd (and vdi-uuid: Not in database). So I used the first one, and when I try to plug it, it says that expected the state of the vm to be powered on.