K8s之deploy挂载Volumes

一. 创建Host类型pv

1.1 创建pv yaml文件

-bash-4.2# cat  iam_mount_pvc.yaml                        
apiVersion: apps/v1
kind: Deployment
metadata:
  creationTimestamp: null
  labels:
    app: iam
  name: iam
spec:
  replicas: 3
  selector:
    matchLabels:
      app: iam
  strategy: {}
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: iam
    spec:
      containers:
      - image: registry.ncloud.navinfo.com/iam/iam:1260cd6
        name: iam
        imagePullPolicy: Always
        resources: {}
        volumeMounts:
        - name: iamvolume
          mountPath: /data/static
      volumes:
      - name: iamvolume
        persistentVolumeClaim:
          claimName: mypvc
status: {}

 

本地挂载目录路径: `/data/static` 数据将会持久化到该路径下面

#### 1.2 kubectl创建pv
```shell script
-bash-4.2# kubectl create namespace iam #### 创建namespace做资源隔离
-bash-4.2# kubectl create -f iam_pv.yaml -n iam
rsistentvolume/myvolume created
-bash-4.2# kubectl get pv -n iam
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
myvolume 5Gi RWO,RWX Retain Available normal 4s
-bash-4.2#
```

### 二、创建pvc
#### 2.1 创建pvc yaml文件
```shell script
-bash-4.2# vim iam_pvc.yaml

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
name: mypvc
spec:
storageClassName: normal
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 3Gi
```
#### 2.2 kubectl创建pvc
```shell script
-bash-4.2# kubectl create -f iam_pvc.yaml -n iam
persistentvolumeclaim/mypvc created
-bash-4.2# kubectl get pvc -n iam
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
mypvc Bound myvolume 5Gi RWO,RWX normal 6s
-bash-4.2#
-bash-4.2# kubectl get pv -n iam
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
myvolume 5Gi RWO,RWX Retain Bound iam/mypvc normal 73s
-bash-4.2#
```

当`STATUS`状态为`Bound`说明`pvc`已经绑定到`pv`上，到这里已完成初步的`pvc`、`pv`的绑定

### 三、创建deploy yaml文件
#### 3.1 挂载pvc
```yaml
-bash-4.2# cat iam_mount_pvc.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
creationTimestamp: null
labels:
app: iam
name: iam
spec:
replicas: 3
selector:
matchLabels:
app: iam
strategy: {}
template:
metadata:
creationTimestamp: null
labels:
app: iam
spec:
containers:
- image: registry.ncloud.navinfo.com/iam/iam:1260cd6
name: iam
imagePullPolicy: Always
resources: {}
volumeMounts:
- name: iamvolume
mountPath: /data/static
volumes:
- name: iamvolume
persistentVolumeClaim:
claimName: mypvc
status: {}
-bash-4.2#
```

#### 3.2 kubectl创建deploy
```shell script
-bash-4.2# kubectl create -f iam_mount_pvc.yaml -n iam
deployment.apps/iam created
-bash-4.2#
-bash-4.2#
-bash-4.2# kubectl get po -n iam
NAME READY STATUS RESTARTS AGE
iam-666475bcf9-gxgfb 1/1 Running 0 8s
iam-666475bcf9-lcljd 1/1 Running 0 8s
iam-666475bcf9-t6tbv 1/1 Running 0 8s
-bash-4.2#
```

#### 3.3 检查是否挂载成功
##### a. 进入port检查
```shell script
-bash-4.2# kubectl -n iam exec -it iam-666475bcf9-t6tbv -- /bin/sh
~/iam # ls
AUTHORS api-ref doc nohup.out test-requirements.txt
ChangeLog babel.cfg docker requirements.txt tools
Dockerfile build etc setup tox.ini
LICENSE build.sh iam setup.cfg
README.rst build_k8s.sh iam.egg-info setup.py
~/iam #
```

##### b. 创建一个文件
```shell script
~/iam # ls /data/static/
~/iam # cat /etc/passwd >/data/static/pwd.txt
~/iam # ls /data/static/
pwd.txt
```
###### c. 检查持久化
```shell script
-bash-4.2# ll /data/static/
total 8
-rw-r--r-- 1 root root 1230 Jul 19 22:44 pwd.txt
```
完成调试。