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Known issues with NCN resource checks

pods_not_running

  • If the output of pods_not_running indicates that there are pods in the Evicted state, it may be because of the root file system being filled up on the Kubernetes node in question. Kubernetes will begin evicting pods once the root file system space is at 85% full, and will continue to evict them until it is back under 80%. This commonly happens on ncn-m001, because it is a location where install and documentation files may have been downloaded. It may be necessary to clean up space in the / directory if this is the root cause of pod evictions.

    • (ncn-mw#) View the free space in the root file system.

      df -h /

    • (ncn-mw#) See how much space is being used in /root/.

      du -h -s /root/

    • (ncn-mw#) List the top 10 files in /root/ that are 1024M or larger.

      du -ah -B 1024M /root | sort -n -r | head -n 10

  • If some *postgresql-db-backup cronjob pods are in Error state, they can be ignored if the most recent pod Completed. The Error pods are cleaned up over time but are left to troubleshoot issues in the case that all retries for the postgresql-db-backup job fail.

  • During a CSM install, while ncn-m001 is still the PIT node, cray-sysmgmt-health-grok-exporter pods are expected to be in Pending state.

  • The hmn-discovery and cray-dns-unbound-manager cronjob pods may be in various transitional states such as Pending, Init, PodInitializing, NotReady, or Terminating. This is expected because these pods are periodically started and often can be caught in intermediate states.