Send system journal logs to console #2399
Conversation
When debugging early boot issues, especially ones that leave the host without functional networking, it's difficult to debug what broke. This change makes the default to send the systemd journal logs to the console on x86_64. We attempted to do this in openshift with a machineconfig, and this broke arm64 and this config was offered as an alternative.
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Default kernel arguments are a last resort for configuration that really can't be done any other way. If we want to do this, I think we should do it by adding a journald config file to the initrd instead. But I'm not sure it's a good idea to do this everywhere. Would it make sense to add this to debugging docs and leave the defaults as is? |
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I'm getting pointed many different directions by the coreos folks here. We need the journal logs in CI, and I was asked to back out openshift/release#38015, and this was the recommended approach by @travier |
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I don't think we should do this by default in FCOS/RHCOS, there'd be a lot of fallout. One in particular is that today printing to the serial console can actually cause large system slowdown, and we explicitly did coreos/fedora-coreos-tracker#1244 to avoid that for basic kernel logs. This would greatly increase the output. |
link/more info?
Yes, but generally only on failures. This relates to ye olde coreos/ignition#585 |
OK, my bad, I hadn't realized that this was just for CI and not something more permanent. |
https://issues.redhat.com/browse/OCPBUGS-11812 is where it broke on ARM
I don't think this would help since the failures were mysterious networking failures. If there was something that if network never comes up, the journals got dumped the serial console might help. |
When debugging early boot issues, especially ones that leave the host without functional networking, it's difficult to debug what broke. This change makes the default to send the systemd journal logs to the console on x86_64. We attempted to do this in openshift with a machineconfig, and this broke arm64 and this config was offered as an alternative.