|NO.Z.00012|——————————|CloudNative|——|Kubernetes&Yaml文件.V01|

一、kubernetes集群YAML文件详解：yaml文件说明

二、快速书写yaml文件

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三、方式一：yaml文件创建

### --- 第一种方式：create命令生成yaml文件

[root@k8s-master ~]# kubectl create deployment web --image=nginx -o yaml --dry-run  # -o yaml把操作用yaml格式生成出， -yaml-dry-run尝试运行，但不正运行
W0222 14:58:10.603590   34484 helpers.go:535] --dry-run is deprecated and can be replaced with --dry-run=client.
apiVersion: apps/v1
kind: Deployment
metadata:
  creationTimestamp: null
  labels:
    app: web
  name: web
spec:
  replicas: 1
  selector:
    matchLabels:
      app: web
  strategy: {}
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: web
    spec:
      containers:
      - image: nginx
        name: nginx
        resources: {}
status: {}

### --- 模板文件生成，可以作为模板
~~~     输出生成my1.yaml文件

[root@k8s-master ~]# kubectl create deployment web --image=nginx -o yaml --dry-run >my1.yaml
W0222 14:59:57.039704   34808 helpers.go:535] --dry-run is deprecated and can be replaced with --dry-run=client.

### --- 可以通过实际的环境中来配置自己的部署环境

[root@k8s-master ~]# cat my1.yaml 
apiVersion: apps/v1
kind: Deployment
metadata:
  creationTimestamp: null
  labels:
    app: web
  name: web
spec:
  replicas: 1
  selector:
    matchLabels:
      app: web
  strategy: {}
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: web
    spec:
      containers:
      - image: nginx
        name: nginx
        resources: {}
status: {}

四、方式二：yaml文件创建

### --- 第二种方式：get命令导出yaml文件；针对于目前已经部署好的环境
~~~     ginx -o=yaml：nginx相关的格式通过yaml格式导出 --export：放到一个文件中

[root@k8s-master ~]# kubectl get deploy nginx -o=yaml --export > my2.yaml
Flag --export has been deprecated, This flag is deprecated and will be removed in future.

[root@k8s-master ~]# ll
total 8
-rw-r--r-- 1 root root  376 Feb 22 14:59 my1.yaml
-rw-r--r-- 1 root root 3026 Feb 22 15:04 my2.yaml 

[root@k8s-master ~]# cat my2.yaml 
apiVersion: apps/v1
kind: Deployment
metadata:
  annotations:
    deployment.kubernetes.io/revision: "1"
  creationTimestamp: null
  generation: 1
  labels:
    app: nginx
  managedFields:
  - apiVersion: apps/v1
    fieldsType: FieldsV1
    fieldsV1:
      f:metadata:
        f:labels:
          .: {}
          f:app: {}
      f:spec:
        f:progressDeadlineSeconds: {}
        f:replicas: {}
        f:revisionHistoryLimit: {}
        f:selector:
          f:matchLabels:
            .: {}
            f:app: {}
        f:strategy:
          f:rollingUpdate:
            .: {}
            f:maxSurge: {}
            f:maxUnavailable: {}
          f:type: {}
        f:template:
          f:metadata:
            f:labels:
              .: {}
              f:app: {}
          f:spec:
            f:containers:
              k:{"name":"nginx"}:
                .: {}
                f:image: {}
                f:imagePullPolicy: {}
                f:name: {}
                f:resources: {}
                f:terminationMessagePath: {}
                f:terminationMessagePolicy: {}
            f:dnsPolicy: {}
            f:restartPolicy: {}
            f:schedulerName: {}
            f:securityContext: {}
            f:terminationGracePeriodSeconds: {}
    manager: kubectl
    operation: Update
    time: "2021-02-19T09:04:17Z"
  - apiVersion: apps/v1
    fieldsType: FieldsV1
    fieldsV1:
      f:metadata:
        f:annotations:
          .: {}
          f:deployment.kubernetes.io/revision: {}
      f:status:
        f:availableReplicas: {}
        f:conditions:
          .: {}
          k:{"type":"Available"}:
            .: {}
            f:lastTransitionTime: {}
            f:lastUpdateTime: {}
            f:message: {}
            f:reason: {}
            f:status: {}
            f:type: {}
          k:{"type":"Progressing"}:
            .: {}
            f:lastTransitionTime: {}
            f:lastUpdateTime: {}
            f:message: {}
            f:reason: {}
            f:status: {}
            f:type: {}
        f:observedGeneration: {}
        f:readyReplicas: {}
        f:replicas: {}
        f:updatedReplicas: {}
    manager: kube-controller-manager
    operation: Update
    time: "2021-02-22T06:25:12Z"
  name: nginx
  selfLink: /apis/apps/v1/namespaces/default/deployments/nginx
spec:
  progressDeadlineSeconds: 600
  replicas: 1
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      app: nginx
  strategy:
    rollingUpdate:
      maxSurge: 25%
      maxUnavailable: 25%
    type: RollingUpdate
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: nginx
    spec:
      containers:
      - image: nginx
        imagePullPolicy: Always
        name: nginx
        resources: {}
        terminationMessagePath: /dev/termination-log
        terminationMessagePolicy: File
      dnsPolicy: ClusterFirst
      restartPolicy: Always
      schedulerName: default-scheduler
      securityContext: {}
      terminationGracePeriodSeconds: 30
status: {}

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五、kubectl命令行工具

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Walter Savage Landor:strove with none,for none was worth my strife.Nature I loved and, next to Nature, Art:I warm'd both hands before the fire of life.It sinks, and I am ready to depart

                                                                                                                                                   ——W.S.Landor

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