k8s基操之-yaml

kubernetes官网命令行介绍#

使用yaml创建一次部署#

1. 使用 —help查看部署帮助

   1
   kubectl create deployment tomcat8 --image=tomcat:8.5-jdk8 --help

   

   --dry-run 尝试部署

   --o yaml 输出 YAML 格式的 API 对象

2. 结合 —dry-run -o yaml 得到一个YAML格式的 API 对象

   1
   kubectl create deployment tomcat8 --image=tomcat:8.5-jdk8 --dry-run -o yaml

   1
   apiVersion: apps/v1
   2
   kind: Deployment
   3
   metadata:
   4
     creationTimestamp: null
   5
     labels:
   6
       app: tomcat8
   7
     name: tomcat8
   8
   spec:
   9
     replicas: 1
   10
     selector:
   11
       matchLabels:
   12
         app: tomcat8
   13
     strategy: {}
   14
     template:
   15
       metadata:
   16
         creationTimestamp: null
   17
         labels:
   18
           app: tomcat8
   19
       spec:
   20
         containers:
   21
           - image: tomcat:8.5-jdk8
   22
             name: tomcat
   23
             resources: {}
   24
   status: {}

   展开收起

3. 结合 —dry-run -o yaml 将得到一个YAML格式的 API 对象重定向输出到文件

   1
   kubectl create deployment tomcat8 --image=tomcat:8.5-jdk8 --dry-run -o yaml > tomcat8.yaml

   修改精简 默认创建一个实例 改成3个

   1
   apiVersion: apps/v1
   2
   kind: Deployment
   3
   metadata:
   4
     labels:
   5
       app: tomcat8
   6
     name: tomcat8
   7
   spec:
   8
     replicas: 3
   9
     selector:
   10
       matchLabels:
   11
         app: tomcat8
   12
     template:
   13
       metadata:
   14
         labels:
   15
           app: tomcat8
   16
       spec:
   17
         containers:
   18
           - image: tomcat:8.5-jdk8
   19
             name: tomcat

   展开收起

4. 应用 tomcat8.yaml文件

   1
   kubectl apply -f tomcat8.yaml

   

5. 得到service的yaml文件

   1
   kubectl expose deployment tomcat8  --port=80 --target-port=8080 --type=NodePort --dry-run -o yaml > tomcat8-expose.yaml

   

6. 应用tomcat8-expose.yaml文件

   1
   kubectl apply -f tomcat8-expose.yaml

7. 查看一个pod是怎么定义的

   1
   kubectl get pods

   

   1
   kubectl get pod tomcat8-54679f746d-khdwk -o yaml

   1
   apiVersion: v1
   2
   kind: Pod
   3
   metadata:
   4
     creationTimestamp: "2020-06-01T06:28:23Z"
   5
     generateName: tomcat8-54679f746d-
   6
     labels:
   7
       app: tomcat8
   8
       pod-template-hash: 54679f746d
   9
     name: tomcat8-54679f746d-khdwk
   10
     namespace: default
   11
     ownerReferences:
   12
       - apiVersion: apps/v1
   13
         blockOwnerDeletion: true
   14
         controller: true
   15
         kind: ReplicaSet
   16
         name: tomcat8-54679f746d
   17
         uid: 9d084d88-b48c-4042-bb94-6db399f38ab5
   18
     resourceVersion: "194623"
   19
     selfLink: /api/v1/namespaces/default/pods/tomcat8-54679f746d-khdwk
   20
     uid: f91d3ee4-96bb-4d4f-86a5-a0ff479a3029
   21
   spec:
   22
     containers:
   23
       - image: tomcat:8.5-jdk8
   24
         imagePullPolicy: IfNotPresent
   25
         name: tomcat
   26
         resources: {}
   27
         terminationMessagePath: /dev/termination-log
   28
         terminationMessagePolicy: File
   29
         volumeMounts:
   30
           - mountPath: /var/run/secrets/kubernetes.io/serviceaccount
   31
             name: default-token-rrc2f
   32
             readOnly: true
   33
     dnsPolicy: ClusterFirst
   34
     enableServiceLinks: true
   35
     nodeName: k8s-node3
   36
     priority: 0
   37
     restartPolicy: Always
   38
     schedulerName: default-scheduler
   39
     securityContext: {}
   40
     serviceAccount: default
   41
     serviceAccountName: default
   42
     terminationGracePeriodSeconds: 30
   43
     tolerations:
   44
       - effect: NoExecute
   45
         key: node.kubernetes.io/not-ready
   46
         operator: Exists
   47
         tolerationSeconds: 300
   48
       - effect: NoExecute
   49
         key: node.kubernetes.io/unreachable
   50
         operator: Exists
   51
         tolerationSeconds: 300
   52
     volumes:
   53
       - name: default-token-rrc2f
   54
         secret:
   55
           defaultMode: 420
   56
           secretName: default-token-rrc2f
   57
   status:
   58
     conditions:
   59
       - lastProbeTime: null
   60
         lastTransitionTime: "2020-06-01T06:28:23Z"
   61
         status: "True"
   62
         type: Initialized
   63
       - lastProbeTime: null
   64
         lastTransitionTime: "2020-06-01T06:28:24Z"
   65
         status: "True"
   66
         type: Ready
   67
       - lastProbeTime: null
   68
         lastTransitionTime: "2020-06-01T06:28:24Z"
   69
         status: "True"
   70
         type: ContainersReady
   71
       - lastProbeTime: null
   72
         lastTransitionTime: "2020-06-01T06:28:23Z"
   73
         status: "True"
   74
         type: PodScheduled
   75
     containerStatuses:
   76
       - containerID: docker://b72526de852740b87745d97765187c16b900d73dd4475aba9bb5ca2f4fda6ef4
   77
         image: tomcat:8.5-jdk8
   78
         imageID: docker-pullable://tomcat@sha256:bb59f86923e098ad54f485853e8f8859e2243cfceae762cccc2e5460ab006237
   79
         lastState: {}
   80
         name: tomcat
   81
         ready: true
   82
         restartCount: 0
   83
         started: true
   84
         state:
   85
           running:
   86
             startedAt: "2020-06-01T06:28:24Z"
   87
     hostIP: 172.16.10.69
   88
     phase: Running
   89
     podIP: 10.244.2.4
   90
     podIPs:
   91
       - ip: 10.244.2.4
   92
     qosClass: BestEffort
   93
     startTime: "2020-06-01T06:28:23Z"

   展开收起

8. 将部署和暴露合并 只需要用 --- 隔开即可

   1
   apiVersion: apps/v1
   2
   kind: Deployment
   3
   metadata:
   4
     labels:
   5
       app: tomcat8
   6
     name: tomcat8
   7
   spec:
   8
     replicas: 3
   9
     selector:
   10
       matchLabels:
   11
         app: tomcat8
   12
     template:
   13
       metadata:
   14
         labels:
   15
           app: tomcat8
   16
       spec:
   17
         containers:
   18
           - image: tomcat:8.5-jdk8
   19
             name: tomcat
   20
   ---
   21
   apiVersion: v1
   22
   kind: Service
   23
   metadata:
   24
     labels:
   25
       app: tomcat8
   26
     name: tomcat8
   27
   spec:
   28
     ports:
   29
       - port: 80
   30
         protocol: TCP
   31
         targetPort: 8080
   32
     selector:
   33
       app: tomcat8
   34
     type: NodePort

   展开收起