Automating erase disk

[glennswest]

I do alot of testing of installs/re-installs that often use lots of vm's.
One of my optimizations in esxi was to just to recreate a empty disk.


gwest@Mac-Pro pocp % cat erasedisk.sh
ssh root@esx.gw.lo "cd /vmfs/volumes/datastore1/$1;rm $1.vmdk;rm $1.vmsd;rm $1-flat.vmdk;vmkfstools --createvirtualdisk 160G --diskformat thin $1.vmdk"
gwest@Mac-Pro pocp %

This gets a bit more fun. As the drive could be either a qcow2 or a lvm drive.
Anyone scripted this? Goal is to just make sure the drive looks empty, and can be done in seconds.
Seems like I need to parse the .conf file, find out if qcow or lvm, and then go from there.

I dont see any qm commands that let me touch drives.

 

[glennswest]

Ok, qcow is trivial:

#getvmid.sh
ssh root@pve.gw.lo "qm list | grep $1 | awk '{print \$1}'"

# create-qcow.sh
export vmid=$(./getvmid.sh $1)
echo $vmid
export drivepath="/impulse1/images/$vmid/vm-$vmid-disk-0.qcow2"
echo $drivepath
ssh root@pve.gw.lo "rm $drivepath"
ssh root@pve.gw.lo "qemu-img create -f qcow2 $drivepath $2"

Next step is to create-lvm.sh and figure out how to choose between automatically.

 

[glennswest]

Getting closer:

Deleting a lvm was trivial
lvremove /dev/pve/vm-700-disk-0 -

But syntax/options for thin disk is avoiding me:
lvcreate -c 512K -L 200G --thinpool vm-700-disk-0 pve

 

[leesteken]

Maybe pvesm can do that for you regardless of storage type?

 

[glennswest]

Fixed it:
This will create a lvm after deleting old one.
Now only need to check if lvm or qcow2

# create-lvm.sh
export vmid=$(./getvmid.sh $1)
echo $vmid
export lvmname="vm-$vmid-disk-0"
export drivepath="/dev/pve/$lvmname"
echo $drivepath
ssh root@pve.gw.lo "lvremove $drivepath -y"
ssh root@pve.gw.lo "lvcreate -n $lvmname -V $2 pve/data"

 

[glennswest]

https://github.com/glennswest/qpve
I manage to determine it with a bit of bash parsing. Crude and rude, but hey it seems fast enough.
Everything is by name, verse needing to remember vmid.

The parse for disktype is in erasedisk.sh
Be careful, it will erase a disk.