Kubernetes Stateful Deployments

The Challenge

A Solution

  • We introduce two Pod annotations; one specifies a volume name and the other its size
  • The solution creates a PersistentVolumeClaim unique to the Deployment’s Pod and sized to the volume size annotation. It is also labeled with key managed and value true
  • It then updates the Pod’s volume named with the volume name annotation to reference the PersistentVolumeClaim; here replacing the emptyDir with the PersistentVolumeClaim
  • It also updates the Pod’s labels with key volume-claim/name; the value being the PersistentVolumeClaim’s name
  • If the mutating admission webhook creates a PersistentVolumeClaim but the Pod is not persisted, the controller deletes the PersistentVolumeClaim
  • Watches for Pod deletions and deletes the associated PersistentVolumeClaims created by the mutating admission webhook

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Broad infrastructure, development, and soft-skill background

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John Tucker

John Tucker

Broad infrastructure, development, and soft-skill background

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