[root@kubernetes1 ~]# mkdir /data/k8s/mysqlpv1

創建pv

[root@kubernetes1 ~]# cat mysql-pv.yml

apiVersion: v1

kind: PersistentVolume

metadata:

name: mysqlpv1

spec:

capacity:

storage: 1Gi

accessModes:

- ReadWriteOnce

persistentVolumeReclaimPolicy: Retain

storageClassName: nfs1

nfs:

path: /data/k8s/mysqlpv1

server: 192.168.211.135

[root@kubernetes1 ~]# kubectl apply -f mysql-pv.yml

persistentvolume "mysqlpv1" created

[root@kubernetes1 ~]# kubectl get pv

NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE

mypv1 1Gi RWO Retain Bound default/mypvc1 nfs 47m

mysqlpv1 1Gi RWO Retain Available nfs1 3s

創建pvc

[root@kubernetes1 ~]# cat mysql-pvc1.yml

apiVersion: v1

kind: PersistentVolumeClaim

metadata:

name: mysqlpvc1

spec:

accessModes:

- ReadWriteOnce

resources:

requests:

storage: 1Gi

storageClassName: nfs1

[root@kubernetes1 ~]# kubectl apply -f mysql-pvc1.yml

persistentvolumeclaim "mysqlpvc1" created

[root@kubernetes1 ~]#

[root@kubernetes1 ~]# kubectl get pvc -o wide

NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE

mypvc1 Bound mypv1 1Gi RWO nfs 48m

mysqlpvc1 Bound mysqlpv1 1Gi RWO nfs1 36s

[root@kubernetes1 ~]#

部署mysql

yml文件參考如下:

一些說明:

--- 這個符號是分隔符

[root@kubernetes1 ~]# cat mysql-svc.yml

apiVersion: v1

kind: Service

metadata:

name: mysql

spec:

ports:

- port: 3306

selector:

app: mysql

---

apiVersion: apps/v1beta1

kind: Deployment

metadata:

name: mysql

spec:

selector:

matchLabels:

app: mysql

template:

metadata:

labels:

app: mysql

spec:

containers:

- image: mysql:5.6

name: mysql

env:

- name: MYSQL_ROOT_PASSWORD

value: password

ports:

- containerPort: 3306

name: mysql

volumeMounts:

- name: mysql-data

mountPath: /var/lib/mysql

volumes:

- name: mysql-data

persistentVolumeClaim:

claimName: mysqlpvc1

[root@kubernetes1 ~]#

[root@kubernetes1 ~]# kubectl apply -f mysql-svc.yml

service "mysql" unchanged

deployment.apps "mysql" created

[root@kubernetes1 ~]# kubectl get pod -o wide

NAME READY STATUS RESTARTS AGE IP NODE

mysql-7bd85dbb6f-5fjlx 1/1 Running 0 3m 10.244.1.106 kubernetes2

可以看到pod在kubernetes2上生成

在這個node執行命令

[root@kubernetes2 ~]# docker ps

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

13b98755ae54 docker.io/mysql@sha256:0267b9b43034ed630e94f846ca825140994166c6c7d39d43d4dbe8d1404e1129 "docker-entrypoint..." 5 minutes ago Up 5 minutes k8s_mysql_mysql-7bd85dbb6f-5fjlx_default_0fae8658-7b73-11e8-bdc5-000c292f3b91_0

inspect下

[root@kubernetes2 ~]# docker inspect 13b98755ae54

可以看到是使用了mysqlpv1

生成數據，測試效果：

在容器操作數據庫：

創建數據庫t1

[root@kubernetes2 ~]# docker exec 13b98755ae54 mysql -uroot -ppassword -e "create database t1"

Warning: Using a password on the command line interface can be insecure.

[root@kubernetes2 ~]# docker exec 13b98755ae54 mysql -uroot -ppassword -e "show databases"

Warning: Using a password on the command line interface can be insecure.

Database

information_schema

mysql

performance_schema

t1

[root@kubernetes2 ~]#

在t1中創建數據表t1

[root@kubernetes2 ~]# docker exec 13b98755ae54 mysql -uroot -ppassword -e "use t1;create table t1(i int);"

Warning: Using a password on the command line interface can be insecure.

數據表t1插入數據並檢索

[root@kubernetes2 ~]# docker exec 13b98755ae54 mysql -uroot -ppassword -e "use t1;insert into t1 values (1),(3),(3);"

Warning: Using a password on the command line interface can be insecure.

[root@kubernetes2 ~]# docker exec 13b98755ae54 mysql -uroot -ppassword -e "use t1;select * from t1;"

Warning: Using a password on the command line interface can be insecure.

i

1

3

3

[root@kubernetes2 ~]#

已經生成了數據，我們看看nfs存儲目錄的情況和容器存儲目錄的情況

nfs目錄

[root@kubernetes1 ~]# ls /data/k8s/mysqlpv1/

auto.cnf ibdata1 ib_logfile0 ib_logfile1 mysql performance_schema t1

[root@kubernetes1 ~]#

[root@kubernetes1 ~]# ls /data/k8s/mysqlpv1/t1

db.opt t1.frm t1.ibd

[root@kubernetes1 ~]#

容器

[root@kubernetes2 ~]# docker exec 13b98755ae54 ls /var/lib/mysql

auto.cnf

ib_logfile0

ib_logfile1

ibdata1

mysql

performance_schema

t1

[root@kubernetes2 ~]# docker exec 13b98755ae54 ls /var/lib/mysql/t1

db.opt

t1.frm

t1.ibd

[root@kubernetes2 ~]#

數據對比可知，pvc使用成功

現在模擬故障，kubernetes2機器死掉

kubernetes2關機

[root@kubernetes2 ~]# init 0

Connection closing...Socket close.

Connection closed by foreign host.

Disconnected from remote host(kubernetes2) at 16:34:27.

[root@kubernetes1 ~]# kubectl get pod -o wide

NAME READY STATUS RESTARTS AGE IP NODE

mysql-7bd85dbb6f-5fjlx 1/1 Unknown 0 30m 10.244.1.106 kubernetes2

mysql-7bd85dbb6f-jwwfv 1/1 Running 0 38s 10.244.2.114 kubernetes3

pod自動切換到kubernetes3了

到kubernetes3上操作容器數據庫

[root@kubernetes3 ~]# docker ps

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

5bb97bd16595 84581e99d807 "nginx -g 'daemon ..." 3 minutes ago Up 3 minutes k8s_nginx-deployment_nginx-deployment-6b5c99b6fd-tcwfc_default_48c5442e-7b77-11e8-bdc5-000c292f3b91_0

eec205b40845 97fdbdd65c6a "docker-entrypoint..." 3 minutes ago Up 3 minutes k8s_mysql_mysql-7bd85dbb6f-jwwfv_default_48b8e8ad-7b77-11e8-bdc5-000c292f3b91_0

檢索數據

[root@kubernetes3 ~]# docker exec eec205b40845 mysql -uroot -ppassword -e "use t1;select * from t1;"

Warning: Using a password on the command line interface can be insecure.

i

1

3

3

[root@kubernetes3 ~]#

數據完好無損

?mysql使用pv和pvc實踐操作記錄