Original topic on the old forums:
I did a system upgrade on a debian VM that broke a few things, and now I want to roll back the VM but I am not sure how. I have all the snapshots, I know that if I roll back a month or two, then I destroy all snapshots in between (would like to avoid that in case the rollback fails for some reason).
What is the best way to do this? Probably clone and then boot the VM from a clone to preserve the original, but how do I do that?
[nils@freenas /mnt/maindata/iohyve/www-bhyve]$ iohyve getall www-bhyve
Getting www-bhyve iohyve properties...
bargs -A_-H_-P
boot 1
con nmdm0
cpu 2
description Sat Mar 4 16:29:47 CET 2017
fw BHYVE_UEFI_CSM.fd
install no
loader grub-bhyve
name www-bhyve
os debian
persist 1
ram 4GB
size 16G
tap tap0
template NO
vnc YES
vnc_h 600
vnc_ip 192.168.2.88
vnc_port 5900
vnc_tablet YES
vnc_w 800
vnc_wait NO
[nils@freenas /mnt/maindata/iohyve/www-bhyve]$ iohyve info
Guest Size CPU RAM Pool
www-bhyve - 2 4GB maindata
www-bhyve/disk0 16G - - maindata
www-bhyve/disk0_dpim64_gui_clone0 16G - - maindata
[nils@freenas /mnt/maindata/iohyve/www-bhyve]$ iohyve list
Guest VMM? Running rcboot? Description
www-bhyve YES YES YES Sat Mar 4 16:29:47 CET 2017
[nils@freenas /mnt/maindata/iohyve/www-bhyve]$ zfs list | grep www-bhyve
maindata/iohyve/www-bhyve 168G 1.07T 128K /mnt/maindata/iohyve/www-bhyve
maindata/iohyve/www-bhyve/disk0 168G 1.08T 15.5G -
maindata/iohyve/www-bhyve/disk0_dpim64_gui_clone0 81.4K 1.07T 7.68G -
[nils@freenas /mnt/maindata/iohyve/www-bhyve]$ ls -al
total 2
drwxr-xr-x 2 root wheel 3 Mar 4 2017 ./
drwxr-xr-x 5 root wheel 5 Apr 12 2019 ../
-rw-r--r-- 1 root wheel 96 Apr 3 10:32 device.map
[nils@freenas /mnt/maindata/iohyve/www-bhyve]$ cd disk0
bash: cd: disk0: No such file or directory
[nils@freenas /mnt/maindata/iohyve/www-bhyve]$ cd disk0_dpim64_gui_clone0
bash: cd: disk0_dpim64_gui_clone0: No such file or directory
[nils@freenas /mnt/maindata/iohyve/www-bhyve]$
Response (thanks for that!) was to:
- Shutdown the vm.
- Clone a snapshot.
- Point the vm at the clone.
- Reboot vm.
- Repeat until you find the snapshot you want.
- Rollback to that one. Removing clones and stuff.
- Then repoint vm at original zvol
Two questions:
- how do I point the VM at the clone? Everything else is clear, but I don’t see how to do this. Reading iohyve/iohyve.8.txt at master · pr1ntf/iohyve · GitHub didn’t help… this VM is old and not in the GUI
- what is www-bhyve/disk0 and www-bhyve/disk0_dpim64_gui_clone0 ? Which one do I clone?
If the second one is a clone already (i don’t remember creating it), can I find out when it was created / last updated? If it’s a clone I can probably delete it.