I updated my server last night, and since then I've been encountering errors in many containers that were working fine before. I'm seeing messages like `sysctl: error setting key 'net.ipv4.conf.all.src_valid_mark': Read-only file system`. I'm trying to configure the following settings:
cap_add:
- NET_ADMIN
- SYS_MODULE
sysctls:
- net.ipv4.ip_forward=1
- net.ipv4.conf.all.src_valid_mark=1
Could the kernel upgrade have caused something to break, or was something drastically changed? I'm running Ubuntu 24.04 LTS with the kernel version 6.8.0-87-generic, and Docker is at version 28.5.1, build e180ab8.
2 Answers
It sounds like you're hitting permission issues, especially since you're getting that 'read-only file system' error. Check to ensure your container isn't running in a virtualized environment like WSL or Mac, because that could be causing the issue. You might also want to try launching the container with the `--privileged` flag to see if that allows it to change kernel parameters.
If everything else fails, a quick troubleshooting step is to boot with the previous kernel version and see if that resolves the issue. Just be careful, since switching kernels might mess with your existing dependencies.
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