注解也是 key-value.

  • 注解可以容纳更多信息
  • 主要给工具使用
  • 想 Kubernetes 引入新特性会使用注解 (不稳定时)

3.6.1 查找对象的注解

查看注解:

  • annotations

image.png

注解不超过 256KB.

3.6.2 添加和修改注解

添加注解:

  1. $ kubectl annotate pod hello-pod abc="def"
  2. pod/hello-pod annotated

查看注解:

  1. $ kubectl describe pod hello-pod
  2. Name:         hello-pod
  3. Namespace:    default
  4. Priority:     0
  5. Node:         minikube/192.168.99.100
  6. Start Time:   Wed, 24 Mar 2021 10:38:47 +0800
  7. Labels:       creation_method=manual
  8. Annotations:  abc: def     # ------------------ 这里
  9. Status:       Running
  10. IP:           172.17.0.7
  11. IPs:
  12.   IP:  172.17.0.7
  13. Containers:
  14.   test-study-k8s:
  15.     Container ID:   docker://56271eb675225daa0f7ba39dc6613a06bcf4f545c7c096ee28e02aa609d1558c
  16.     Image:          jdxj/study_kubernetes:v0.1.0
  17.     Image ID:       docker-pullable://jdxj/study_kubernetes@sha256:91be05eac3742a5cd670526017c8a8a54705ed002a137e8b7fb0f553177abaec
  18.     Port:           8080/TCP
  19.     Host Port:      0/TCP
  20.     State:          Running
  21.       Started:      Wed, 24 Mar 2021 10:39:01 +0800
  22.     Ready:          True
  23.     Restart Count:  0
  24.     Environment:    <none>
  25.     Mounts:
  26.       /var/run/secrets/kubernetes.io/serviceaccount from default-token-vvp8b (ro)
  27. Conditions:
  28.   Type              Status
  29.   Initialized       True 
  30.   Ready             True 
  31.   ContainersReady   True 
  32.   PodScheduled      True 
  33. Volumes:
  34.   default-token-vvp8b:
  35.     Type:        Secret (a volume populated by a Secret)
  36.     SecretName:  default-token-vvp8b
  37.     Optional:    false
  38. QoS Class:       BestEffort
  39. Node-Selectors:  <none>
  40. Tolerations:     node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
  41.                  node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
  42. Events:          <none>

应该使用前缀来避免命名冲突:

  • abc/def="def"