having an issue with Qemu Agent on my VM using snapshot backup of cPanel

Spirogg

• February 02, 2022 08:26

hello, I have Proxmox setup on my server and a VM with my cPanel with a few sites on it.. every time I try to backup the VM of AlmaLinux 8.5 and cPanel Qemu Agant Freeze and stops the back. on Proxmox forum i read this here Securetmp enables /dev/loop mounts You'll need to disable it if you want to run snapshots/backups with CloudLinux https://support.cpanel.net/hc/en-us/articles/360058525333-How-to-disable-scripts-securetmp This is what CloudLinux sent me Hello, The issue is not related to CloudLinux directly, but to Qemu agent, which does not freeze the file system(s) correctly. What is actually happening: When VM backup is invoked, Qemu agent freezes the file systems, so no single change will be made during the backup. But Qemu agent does not respect the loop* devices in freezing order (we have checked its sources), which leads to the next situation: 1) freeze loopback fs ---> send async reqs to loopback thread 2) freeze main fs 3) loopback thread wakes up and trying to write data to the main fs, which is still frozen, and this finally leads to the hung task and kernel crash. I'm afraid we have no further recommendations at this point. Thank you.
just wondering if I try to turn off SecureTMP

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  cPRex Jurassic Moderator

  • February 03, 2022 18:42

  Hey there! We don't recommend changing the tmp settings. If tmp isn't secured, it's possible for scripts to run in there and access things they shouldn't. If you wanted to reverse the changes you'd get the same prompt when the script was run a second time - you'd just choose "y" instead of "n" to reactivate it. Full documentation on that can be found here:

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  Spirogg

  • February 04, 2022 22:48

  Thank you for the link. Kind regards. Spiro

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  cPRex Jurassic Moderator

  • February 07, 2022 20:07

  Sure thing!

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