[SOLVED] LXC container snapshot problem

[Koleon]

Dear Proxmox community,

I run PVE 8.2.7 installed on Debian 12 (as I wanted to have a full disk encryption via Secure Boot) with encrypted ZFS pool. Then I created a dataset with some custom attributes (compression, quotas, refQuotas) and added it via GUI - Datacenter -> Storage -> Add -> Directory with all Content (Disk Image, ISO images etc.) allowed. Unfortunately, when I try to create snapshot of a newly created Container running Debian 12, I see only "The current guest configuration does not support taking new snapshots" in the GUI.


Could you help me to debug the problem, please? What's wrong with this setup?
I've noticed only this recommendation https://pve.proxmox.com/wiki/ZFS:_Tips_and_Tricks#Snapshot_of_LXC_on_ZFS, but I'm not getting any error as the GUI does not let me to proceed.

I would be grateful for any hints.
Thank you

 

[leesteken]

Please show your container configuration file with pct config 100. Maybe it has some mountpoints?

 

[Koleon]

Please show your container configuration file with pct config 100. Maybe it has some mountpoints?

Hi @leesteken
thank you for prompt reply. Here's the output:

root@pve:~# pct config 100
arch: amd64
cores: 2
hostname: test.home.arpa
memory: 2048
net0: name=eth0,bridge=vmbr0,firewall=1,gw=192.168.50.1,hwaddr=BC:24:11:E8:FB:BD,ip=192.168.50.4/24,tag=50,type=veth
ostype: debian
rootfs: vm-ct-drives:100/vm-100-disk-0.raw,size=8G
swap: 512
unprivileged: 1

 

[leesteken]

rootfs: vm-ct-drives:100/vm-100-disk-0.raw,size=8G

You are using a Directory storage with a raw file, which does not support snapshots: https://pve.proxmox.com/pve-docs/pve-admin-guide.html#chapter_storage
Try using qcow2 or a different storage that does support snapshots.

 

[Koleon]

Bingo! Thanks a lot, that was the issue.

Well, I'm still new to the Proxmox ecosystem and I couldn't find much about Storage best-practice so I created the Directory storage type.
Now, I recreated the vm-ct-drives as the ZFS (local) and deployed the Debian container the same way and snapshot feature works. Even though this storage type supports only VM Disks and CT Volumes..
Would you recommended me to stick with ZFS (local) for VMs and CTs and use Directory storage type for CT Templates, ISOs, Backups? Or is it better to use the Directory for VMs/CTs with qcow2 format? What are the pros and cons please?