Garbage Collection

• metadata.ownerReferences

  k8s会使用ownerReferences来表示controller,pod之间owner与dependency的关系
  比如deploy创建rs,rs创建pod

  #rs
      ownerReferences:
      - apiVersion: apps/v1
          blockOwnerDeletion: true
          controller: true
          kind: Deployment
          name: echo
          uid: db619adf-6af8-4432-be5b-80433f37163d
      ---
  #pod
      ownerReferences:
      - apiVersion: apps/v1
          blockOwnerDeletion: true
          controller: true
          kind: ReplicaSet
          name: traefik-ingress-7d6bcd7dc7
          uid: ce60e706-dfd9-4d40-9fb5-996e3f9f8cc3
  

• 删除方部

  • cascading deletion

    就是owner被删除,对应的dependency也同时删除

    • Foreground

      owner先被标记删除,状态为deletion in progress gc介入开始删除dependency 最后删除owner

    • Background

      owner直接被删除,dependency在后台删除

  • orphaned

    只删除owner,保留dependency

  #默认cascading deletion
  kubectl delete replicaset my-repset
  #保留dependency
  kubectl delete replicaset my-repset --cascade=false