kubernetes资源清单定义入门

大部分资源的配置清单：
apiversion：group/version ( 可以使用kubectl api-versions查看当前支持的api版本)
kind：资源类别
metadata：元数据
   name：唯一的
   namespace：命名空间
   lables：标签，键值数据
   annotations：注解
   ownerReferences：
   resourceVersion：
   selfLink：
   uid：唯一标识
     每个资源额引用PATH
        /api/GROUP/VERSION/namespace/NAMESPACE/TYPE/NAME
spec:期望的状态 disired state
status：当前状态，current state，本自断由kubernetes集群维护

apiVersion: v1
kind: Pod
metadata: 
  name: pod-demo
  namespace: default
  labels:
    app: myapp
    tier: frontend
spec: 
  containers:
  - name: myapp
    image: nginx
  - name: busybox
    image: busybox
    command:
    - "/bin/sh"
    - "-c"
    - "sleep 3600"

[root@kuberneters-master yaml-file]# kubectl create -f pod-demo.yaml 
pod/pod-demo created
[root@kuberneters-master yaml-file]# kubectl get pod
NAME                     READY   STATUS              RESTARTS   AGE
nginx-6799fc88d8-ltkrp   1/1     Running             0          3d4h
nginx-6799fc88d8-m27bl   1/1     Running             1          17d
nginx-6799fc88d8-zg2x8   1/1     Running             1          17d
pod-demo                 0/2     ContainerCreating   0          13s
[root@kuberneters-master yaml-file]# kubectl get pod
NAME                     READY   STATUS    RESTARTS   AGE
nginx-6799fc88d8-ltkrp   1/1     Running   0          3d4h
nginx-6799fc88d8-m27bl   1/1     Running   1          17d
nginx-6799fc88d8-zg2x8   1/1     Running   1          17d
pod-demo                 2/2     Running   0          25s

[root@kuberneters-master yaml-file]# kubectl describe pods pod-demo
Name:         pod-demo
Namespace:    default
Priority:     0
Node:         kuberneters-node-2/192.168.3.105
Start Time:   Tue, 22 Jun 2021 16:14:39 +0800
Labels:       app=myapp
              tier=frontend
Annotations:  <none>
Status:       Running
IP:           10.244.2.6
IPs:
  IP:  10.244.2.6
Containers:
  myapp:
    Container ID:   docker://1cd8d468c12ca186f2b18b11cb708189107d48f33e270c3f8687040ac9596824
    Image:          nginx
    Image ID:       docker-pullable://nginx@sha256:6d75c99af15565a301e48297fa2d121e15d80ad526f8369c526324f0f7ccb750
    Port:           <none>
    Host Port:      <none>
    State:          Running
      Started:      Tue, 22 Jun 2021 16:14:46 +0800
    Ready:          True
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-dhqb7 (ro)
  busybox:
    Container ID:  docker://6e44d214f9c14a30b5db945b60127049ea8903fbcba733fac4df3b27d233796b
    Image:         busybox
    Image ID:      docker-pullable://busybox@sha256:930490f97e5b921535c153e0e7110d251134cc4b72bbb8133c6a5065cc68580d
    Port:          <none>
    Host Port:     <none>
    Command:
      /bin/sh
      -c
      sleep 3600
    State:          Running
      Started:      Tue, 22 Jun 2021 16:14:55 +0800
    Ready:          True
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-dhqb7 (ro)
Conditions:
  Type              Status
  Initialized       True 
  Ready             True 
  ContainersReady   True 
  PodScheduled      True 
Volumes:
  kube-api-access-dhqb7:
    Type:                    Projected (a volume that contains injected data from multiple sources)
    TokenExpirationSeconds:  3607
    ConfigMapName:           kube-root-ca.crt
    ConfigMapOptional:       <nil>
    DownwardAPI:             true
QoS Class:                   BestEffort
Node-Selectors:              <none>
Tolerations:                 node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
                             node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
Events:
  Type    Reason     Age   From               Message
  ----    ------     ----  ----               -------
  Normal  Scheduled  113s  default-scheduler  Successfully assigned default/pod-demo to kuberneters-node-2
  Normal  Pulling    111s  kubelet            Pulling image "nginx"
  Normal  Pulled     106s  kubelet            Successfully pulled image "nginx" in 4.454033806s
  Normal  Created    106s  kubelet            Created container myapp
  Normal  Started    106s  kubelet            Started container myapp
  Normal  Pulling    106s  kubelet            Pulling image "busybox"
  Normal  Pulled     97s   kubelet            Successfully pulled image "busybox" in 8.33975599s
  Normal  Created    97s   kubelet            Created container busybox
  Normal  Started    97s   kubelet            Started container busybox