When deploying Gremlin to Kubernetes and not using the official helm chart, you may encounter errors indicating that a file under /sys/fs/cgroup (or potentially another location based on how you deploy) has been mounted readonly:
level=error msg="unlinkat /sys/fs/cgroup/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-example.slice/cri-containerd-example.scope: read-only file system"
You can verify whether this is mounted readonly (ro, in this output it is set to read/write rw) by examining the Daemonset and examining the path where the errors are occurring:
$ kubectl describe ds gremlin -n gremlin | grep /sys/fs/cgroup -A1
/sys/fs/cgroup from cgroup-root (rw)Due to how cgroup v2 is implemented, for successful deployment Gremlin needs /sys/fs/cgroup to be mounted rw as outlined in the associated helm chart update:
https://github.com/gremlin/helm/pull/70
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