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# 一、创建对象
编写deployment.yaml文件，内容如下:
```yaml
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
```
然后使用如下命令创建对象
```bash
[root@master object_manage]# kubectl create -f deployment.yaml
namespace/dev created
deployment.apps/nginx created
[root@master object_manage]#
```
# 二、查看对象
使用如下命令可查看创建的对象
```bash
[root@master object_manage]# kubectl get -f deployment.yaml
NAME            STATUS   AGE
namespace/dev   Active   98s

NAME                    READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/nginx   1/1     1            1           98s
[root@master object_manage]#
```
# 三、更新对象
编辑deployment.yaml文件，修改副本数为3，设置nginx镜像的tag为1.17.3，如下：
```yaml
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
```
然后使用如下命令额更新
```bash
[root@master object_manage]# kubectl replace -f deployment.yaml
namespace/dev replaced
deployment.apps/nginx replaced
[root@master object_manage]#
```
此时使用如下命令查看，可以发现pod数量已经更新为3个，此外nginx的镜像的tag也更新为1.17.3
```bash
[root@master object_manage]# kubectl get -f deployment.yaml -o wide
NAME            STATUS   AGE
namespace/dev   Active   5m52s

NAME                    READY   UP-TO-DATE   AVAILABLE   AGE     CONTAINERS   IMAGES         SELECTOR
deployment.apps/nginx   3/3     3            3           5m52s   nginx        nginx:1.17.3   run=nginx
[root@master object_manage]#
```
# 四、删除对象

使用如下命令即可删除
```bash
[root@master object_manage]# kubectl delete -f deployment.yaml
namespace "dev" deleted
deployment.apps "nginx" deleted
[root@master object_manage]#
```

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