Error: Failed to retrieve PID of executing child process

LXD Support
1

I get this error sometimes.

Error: Failed to retrieve PID of executing child process

Today I found that this can be caused by process limit exhaustion, here is where I found it:

https://youtu.be/qjWI7DTS7L8?t=614

And on the host the kernel.pid_max is already 4194304. Is there something that can be done here or is it a hard limit and nothing can be done?

By the way, no process limit is set on any of the containers.

Thanks.

2

In that case it seems likely something is deleting the lxc.conf file from /var/snap/lxd/common/lxd/logs/ see

https://github.com/canonical/lxd/issues/12084

3

After deleting some containers, some logs of containers still were present in “/var/snap/lxd/common/lxd/logs/”. Will they get cleaned up automatically? If so, what’s the cleanup interval?

We have seen that github issue, and as a simple workaround, we create a backup script that backs up the lxc.conf file and restores it when it’s missing.

However, when the containers were deleted, the dirs were still present in “/var/snap/lxd/common/lxd/logs/”. Not sure if we have to clean those using a script or if will they be automatically cleaned up.