使用kubectl命令创建yaml模板

1、创建deployment模板
1.1、以tomcat为例

[root@k8s-master-node1 ~]# kubectl create deployment tomcat --image=tomcat:8 -o yaml --dry-run=client >tomcat.yaml
[root@k8s-master-node1 ~]# ll
total 5235984
-rw-------. 1 root root       6880 Oct 30  2020 anaconda-ks.cfg
-rw-r--r--  1 root root    9506321 May 19 00:07 apache-maven-3.6.3-bin.tar.gz
-rw-r--r--. 1 root root 2913150976 May 18 03:19 chinaskills_cloud_paas_v2.0.2.iso
-rw-------. 1 root root       6587 Oct 30  2020 original-ks.cfg
 -rw-r--r--  1 root root        392 May 19 06:03 tomcat.yaml

1.2、查看创建的模板

[root@k8s-master-node1 ~]# cat tomcat.yaml 
apiVersion: apps/v1
kind: Deployment
metadata:
 creationTimestamp: null
 labels:
   app: tomcat
 name: tomcat
spec:
 replicas: 1
 selector:
   matchLabels:
     app: tomcat
 strategy: {}
 template:
   metadata:
     creationTimestamp: null
     labels:
       app: tomcat
   spec:
     containers:
     - image: tomcat:8
       name: tomcat
       resources: {}
status: {}

1.3、创建tomcat

[root@k8s-master-node1 ~]# kubectl create -f tomcat.yaml
deployment.apps/tomcat created

1.4、查看创建状态

[root@k8s-master-node1 ~]# kubectl get pod
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=client >tomcat_svc.yaml

2.1、查看创建的svc模板

[root@k8s-master-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-master-node1 ~]# kubectl get svc
NAME                  TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)             AGE
mtomcat               NodePort    10.1.218.47    <none>        80:22856/TCP        39m

3、检查是否可用

[root@k8s-master-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