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Unable to save jenkins system configuration, how to fix that?

kr flag

I am running jenkins in eks cluster. Till yesterday it worked, but today when I want to change any configuration in the jenkins system configuration page, it is not saving anything and page is also not loading properly.

Below is the log I got from the jenkins pod. Log file github link

I tried to paste here but character limit exceeded.

Could you please suggest what need to be fixed?

cl flag
Check file permissions. See what user jenkins runs as, then check if the dirs and files indeed grant access to said user.
kr flag
it is running in kubernetes container, so permission should not be an issue right
cl flag
Why? Kubernetes is not exempt from file permissions. Unless absolutely everything is run as root, that is.
kr flag
it is used to work earlier, only since yesterday getting this error.If it is permissions, it should not work before also right? And using the official image only https://hub.docker.com/r/jenkinsci/jenkins/ There it defaults to jenkins user. Even when I try to access the shell of pod and try to run sudo, gets error as sudo command not found.
cl flag
Right, then don't try to figure out what's wrong :) Because it used to work. And FYI sudo is not installed by default in most distro containers, so that doesn't seem abnormal to me.
kr flag
permissions are there to the jenkins user. Because using the default image only jenkins/jenkins. COuld you please suggest any other steps. Because changing to root user also not supporting as no sudo command
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