Docker/AppArmor not working properly after update to ProxMox kernel

DerSpatz · Oct 1st 2024

Hey everyone,

I plan on changing my network card from AQC100 to RTL8126. In preparation for this, I decided to change the kernel with the built in tool to the latest ProxMox kernel 6.8, as it should have native support for the new NIC.

After rebooting, I noticed a very high system load that did not go down after several minutes. I investigated and found that some of the docker containers I am running behave unexpectedly, thus causing the high system load. I also can't reach my containers from the web.

Here are the relevant parts of the logs of some of the containers, and the log from dmesg:

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Code

immich-postgres:
2024-10-01 19:53:55.210 UTC [1] FATAL:  called `Result::unwrap()` on an `Err` value: Os { code: 13, kind: PermissionDenied, message: "Permission denied" }
2024-10-01 19:53:55.210 UTC [1] LOG:  database system is shut down

watchtower:
time="2024-10-01T21:56:22+02:00" level=error msg="permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get \"http://%2Fvar%2Frun%2Fdocker.sock/v1.25/containers/json?filters=%7B%22status%22%3A%7B%22running%22%3Atrue%7D%7D\": dial unix /var/run/docker.sock: socket: permission denied"
time="2024-10-01T21:56:22+02:00" level=info msg="Waiting for the notification goroutine to finish" notify=no

vaultwarden:
thread 'main' panicked at /root/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.39.2/src/signal/unix.rs:58:53:
failed to create UnixStream: Os { code: 13, kind: PermissionDenied, message: "Permission denied" }
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

dmesg:
kauditd_printk_skb: 1390139 callbacks suppressed
[  769.341735] audit: type=1400 audit(1727812722.236:209006964): apparmor="DENIED" operation="create" class="net" info="failed type and protocol match" error=-13 profile="docker-default" pid=5391 comm="su-exec" family="unix" sock_type="stream" protocol=0 requested="create" denied="create" addr=none
[  769.341739] audit: type=1400 audit(1727812722.237:209006965): apparmor="DENIED" operation="create" class="net" info="failed type and protocol match" error=-13 profile="docker-default" pid=5391 comm="su-exec" family="unix" sock_type="stream" protocol=0 requested="create" denied="create" addr=none
[  769.341741] audit: type=1400 audit(1727812722.237:209006966): apparmor="DENIED" operation="create" class="net" info="failed type and protocol match" error=-13 profile="docker-default" pid=5391 comm="su-exec" family="unix" sock_type="stream" protocol=0 requested="create" denied="create" addr=none
[  769.341743] audit: type=1400 audit(1727812722.237:209006967): apparmor="DENIED" operation="create" class="net" info="failed type and protocol match" error=-13 profile="docker-default" pid=5391 comm="su-exec" family="unix" sock_type="stream" protocol=0 requested="create" denied="create" addr=none

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The dmesg-logs were spammed with the audit message.

Judging from the logs, it seems like the kernel update caused some unwanted behaviour of apparmor.

Debian/OMV is running natively on the system, and all packages in my system are up to date. The versions of docker are:
docker-ce 5:27.3.1-1~debian.12~bookworm and docker-compose-plugin 2.29.7-1~debian.12~bookworm, I am using the OMV compose plugin to manage my containers.

Rebooting with the old kernel fixes the issue, so that's what I'm doing for now. But still, dmesg is spammed with this message:

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What can I do to resolve this issue, so I can use the latest ProxMox kernel?

Best regards,

Bastian

ryecoaaron · Oct 1st 2024

Quote from DerSpatz

What can I do to resolve this issue,

The Proxmox kernel is from Ubuntu where apparmor is always running. I would just uninstall the apparmor package (leave libapparmor1 installed) or disable apparmor. Plenty of threads on this forum about how to do that.

DerSpatz · Oct 2nd 2024

Thank you, removing apparmor worked. I was not sure whether it was okay to remove this security related package.

Docker/AppArmor not working properly after update to ProxMox kernel

DerSpatz Oct 2nd 2024

DerSpatz Oct 2nd 2024

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