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Debugging Ephemeral Disk in Kubernetes

#debugging

Debugging Ephemeral Disk in Kubernetes

Useful links on discussing ephemeral storage in OpenShift

TODO: Add links for same in OpenShift 4

Funky log messages…​ when ephemeral limit request is not set, the system logs it as 0.

1:32:26 PM    Warning    Evicted     The node was low on resource: ephemeral-storage. Container mycontainer was using 215481700Ki, which exceeds its request of 0.

message: 'The node was low on resource: ephemeral-storage. ' Some of these variables were not in use…​ (old notes as of 2021)

    // nodeLowMessageFmt is the message for evictions due to resource pressure.
    nodeLowMessageFmt = "The node was low on resource: %v. "
    // nodeConditionMessageFmt is the message for evictions due to resource pressure.                                <--------------------NOT IN USE
    nodeConditionMessageFmt = "The node had condition: %v. "                                          <--------------------NOT IN USE
    // containerMessageFmt provides additional information for containers exceeding requests
    containerMessageFmt = "Container %s was using %s, which exceeds its request of %s. "
    // containerEphemeralStorageMessageFmt provides additional information for containers which have exceeded their ES limit                                <--------------------NOT IN USE
    containerEphemeralStorageMessageFmt = "Container %s exceeded its local ephemeral storage limit %q. "                                <--------------------NOT IN USE
    // podEphemeralStorageMessageFmt provides additional information for pods which have exceeded their ES limit
    podEphemeralStorageMessageFmt = "Pod ephemeral local storage usage exceeds the total limit of containers %s. "
    // emptyDirMessageFmt provides additional information for empty-dir volumes which have exceeded their size limit
    emptyDirMessageFmt = "Usage of EmptyDir volume %q exceeds the limit %q. "