使用kubectl命令创建yaml模板

1、创建deployment模板
1.1、以tomcat为例

kubectl create deployment tomcat --image=tomcat:8 -o yaml --dry-run >tomcat.yaml

1.2、查看创建的模板

[root@k8s-node1 ~]# cat tomcat.yaml 
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  labels:
    app: mtomcat
  name: mtomcat
spec:
  replicas: 1
  selector:
    matchLabels:
      app: mtomcat
  strategy: {}
  template:
    metadata:
      labels:
        app: mtomcat
    spec:
      containers:
      - image: tomcat:8
        name: mtomcat
        resources: {}

1.3、创建tomcat

kubectl create -f tomcat.yaml

1.4、查看创建状态

[root@k8s-node1 ~]# kubectl get pod
NAME                                   READY     STATUS    RESTARTS   AGE
mtomcat-7d6b5577b9-rwt6z               1/1       Running   0          39m

2、创建svc模板

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

2.1、查看创建的svc模板

[root@k8s-node1 ~]# cat tomcat_svc.yaml 
apiVersion: v1
kind: Service
metadata:
  labels:
    app: mtomcat
  name: mtomcat
spec:
  ports:
  - port: 80              #映射到宿主机端口
    protocol: TCP
    targetPort: 8080      #容器端口
  selector:
    app: mtomcat
  type: NodePort

2.2、创建svc

kubectl create -f tomcat_svc.yaml

2.3、查看创建状态

[root@k8s-node1 ~]# kubectl get svc
NAME                  TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)             AGE
mtomcat               NodePort    10.1.218.47            80:22856/TCP        39m

3、检查是否可用

[root@k8s-node1 ~]# curl -I 192.168.29.176:22856
HTTP/1.1 200 
Content-Type: text/html;charset=UTF-8
Transfer-Encoding: chunked
Date: Thu, 28 Nov 2019 02:15:24 GMT