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pvc_scenario.md

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PVC scenario

Scenario to fill up a given PersistenVolumeClaim by creating a temp file on the PVC from a pod associated with it. The purpose of this scenario is to fill up a volume to understand faults cause by the application using this volume.

Sample scenario config
pvc_scenario:
  pvc_name: <pvc_name>          # Name of the target PVC
  pod_name: <pod_name>          # Name of the pod where the PVC is mounted, it will be ignored if the pvc_name is defined
  namespace: <namespace_name>   # Namespace where the PVC is
  fill_percentage: 50           # Target percentage to fill up the cluster, value must be higher than current percentage, valid values are between 0 and 99
  duration: 60                  # Duration in seconds for the fault
Steps
  • Get the pod name where the PVC is mounted
  • Get the volume name mounted in the container pod
  • Get the container name where the PVC is mounted
  • Get the mount path where the PVC is mounted in the pod
  • Get the PVC capacity and current used capacity
  • Calculate file size to fill the PVC to the target fill_percentage
  • Connect to the pod
  • Create a temp file kraken.tmp with random data on the mount path:
    • dd bs=1024 count=$file_size </dev/urandom > /mount_path/kraken.tmp
  • Wait for the duration time
  • Remove the temp file created:
    • rm kraken.tmp