一、创建对象

编辑deployment.yaml文件，内容如下：

apiVersion: v1
kind: Namespace
metadata:
  name: dev
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx
  namespace: dev
spec:
  replicas: 3
  selector:
    matchLabels:
      run: nginx
  template:
    metadata:
      labels:
        run: nginx
    spec:
      containers:
      - image: nginx:1.17.3
        name: nginx
        ports:
        - containerPort: 80
          protocol: TCP

使用如下命令创建对象

[root@master object_manage]# kubectl apply -f deployment.yaml
namespace/dev created
deployment.apps/nginx created
[root@master object_manage]#

二、查看对象

使用如下命令即可查看创建的对象

[root@master object_manage]# kubectl get -f deployment.yaml
NAME            STATUS   AGE
namespace/dev   Active   55s

NAME                    READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/nginx   3/3     3            3           55s
[root@master object_manage]#

三、更新对象

更新deployment.yaml文件，将副本数修改为1，同时将nginx的镜像的tag降为1.17.1，如下：

apiVersion: v1
kind: Namespace
metadata:
  name: dev
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx
  namespace: dev
spec:
  replicas: 1
  selector:
    matchLabels:
      run: nginx
  template:
    metadata:
      labels:
        run: nginx
    spec:
      containers:
      - image: nginx:1.17.1
        name: nginx
        ports:
        - containerPort: 80
          protocol: TCP

然后使用如下命令更新

[root@master object_manage]# kubectl apply -f deployment.yaml
namespace/dev unchanged
deployment.apps/nginx configured
[root@master object_manage]#

这里注意，如果yaml文件没有修改，apply命令也是可以执行的，只是不会做任何操作，如下：

[root@master object_manage]# kubectl apply -f deployment.yaml
namespace/dev unchanged
deployment.apps/nginx unchanged
[root@master object_manage]#

四、删除对象

使用如下命令即可完成对象删除

[root@master object_manage]# kubectl delete -f deployment.yaml
namespace "dev" deleted
deployment.apps "nginx" deleted
[root@master object_manage]#