部署 Wordpress 到 OpenShift

Table of Contents

目的
环境
步骤

目的

配置 NFS 共享为 OpenShift 节点提供存储，并且配置 OpenShift 持久卷以绑定至数据库 Pod。
部署 Wordpress 到 OpenShift

环境

openshift v3.11.16/kubernetes v1.11.0

步骤

创建工程

1. CLI 登录到 OCP

$ oc login https://master.example.com:8443 -u admin -p admin

2. 创建工程

$ oc new-project lab07

NFS 持久化存储配置

1. NFS 服务器上创建两个 NFS exports

# mkdir -p /var/export/data/mysql
# mkdir -p /var/export/data/wp

# chown nfsnobody:nfsnobody /var/export/data/mysql/
# chown nfsnobody:nfsnobody /var/export/data/wp/

# chmod 700 /var/export/data/mysql/
# chmod 700 /var/export/data/wp/

2. 创建 /etc/exports.d/wordpressvol.exports 文件，添加如下内容

/var/export/data/mysql *(rw,async,all_squash)
/var/export/data/wp *(rw,async,all_squash)

3. 使 NFS 共享生效

# exportfs -a

4. 查看 NFS 共享卷

# showmount -e
Export list for nfs.example.com:
/var/export/data/wp     *
/var/export/data/mysql  *

创建 PV

1. 创建 pv-mysql.yaml，添加如下内容

apiVersion: v1
kind: PersistentVolume
metadata:
  name: mysql-volume
spec:
  capacity:
    storage: 3Gi
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Recycle
  nfs:
    server: nfs.example.com
    path: /var/export/data/mysql

2. 执行 pv-mysql.yaml，创建 Mysql Volume

# oc create -f pv-mysql.yaml

3. 创建 pv-wp.yaml，添加如下内容

apiVersion: v1
kind: PersistentVolume
metadata:
  name: wp-volume
spec:
  capacity:
    storage: 1Gi
  accessModes:
    - ReadWriteOnce
    - ReadWriteMany
  persistentVolumeReclaimPolicy: Recycle
  nfs:
    server: nfs.example.com
    path: /var/export/data/wp

4. 执行 pv-wp.yaml，创建 wordpree Volume

# oc create -f pv-wp.yaml

5. 查看创建的 PV

# oc get pv
NAME              CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS      CLAIM                      STORAGECLASS   REASON    AGE
mysql-volume      3Gi        RWO            Recycle          Available                                                       3m
wp-volume         1Gi        RWO,RWX        Recycle          Available                                                       1m

创建 PVC

1. 创建 pvc-mysql.yaml，内容如下

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: claim-mysql
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 3Gi

2. 执行 pvc-mysql.yaml，创建 Mysql Claim

# oc create -f pvc-mysql.yaml

3. 创建 pvc-wp.yaml, 内容如下

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: claim-wp
spec:
  accessModes:
    - ReadWriteOnce
    - ReadWriteMany
  resources:
    requests:
      storage: 1Gi

4. 执行 pvc-wp.yaml，创建 WordPress Claim

# oc create -f pvc-wp.yaml

5. 产看创建的 PVC

# oc get pvc
NAME          STATUS    VOLUME         CAPACITY   ACCESS MODES   STORAGECLASS   AGE
claim-mysql   Bound     mysql-volume   3Gi        RWO                           3m
claim-wp      Bound     wp-volume      1Gi        RWO,RWX                       1m

创建 mysql 服务

1. 创建 pod-mysql.yaml，内容如下

apiVersion: v1
kind: Pod
metadata:
  name: mysql
  labels:
    name: mysql
spec:
  containers:
    - resources:
        limits :
          cpu: 0.5
      image: registry.example.com/rhscl/mysql-57-rhel7:latest
      name: mysql
      env:
        - name: MYSQL_ROOT_PASSWORD
          value: redhat
        - name: MYSQL_USER
          value: wp_user
        - name: MYSQL_PASSWORD
          value: wp_pass
        - name: MYSQL_DATABASE
          value: wp_db
      ports:
        - containerPort: 3306
          name: mysql
      volumeMounts:
        - name: mysql-persistent-storage
          mountPath: /var/lib/mysql/data
  volumes:
    - name: mysql-persistent-storage
      persistentVolumeClaim:
        claimName: claim-mysql

2. 执行 pod-mysql.yaml，创建 mysql 容器

# oc create -f pod-mysql.yaml

3. 创建 svc-mysql.yaml，内容如下

apiVersion: v1
kind: Service
metadata:
  labels:
    name: mysql
  name: mysql
spec:
  ports:
    - port: 3306
  selector:
    name: mysql

4. 执行 svc-mysql.yaml，创建 Mysql 服务

# oc create -f svc-mysql.yaml

5. 查看运行的 mysql 服务

# oc get pods
NAME      READY     STATUS    RESTARTS   AGE
mysql     1/1       Running   0          4m

6. 查看 NFS 端导出的 Mysql 文件

# ssh nfs.example.com 'ls -la /var/export/data/mysql'
total 41040
drwx------. 6 nfsnobody nfsnobody     4096 Dec  1 23:16 .
drwxr-xr-x. 4 root      root            29 Dec  1 22:50 ..
-rw-r-----. 1 nfsnobody nfsnobody       56 Dec  1 23:16 auto.cnf
-rw-------. 1 nfsnobody nfsnobody     1676 Dec  1 23:16 ca-key.pem
-rw-r--r--. 1 nfsnobody nfsnobody     1112 Dec  1 23:16 ca.pem
-rw-r--r--. 1 nfsnobody nfsnobody     1112 Dec  1 23:16 client-cert.pem
-rw-------. 1 nfsnobody nfsnobody     1676 Dec  1 23:16 client-key.pem
-rw-r-----. 1 nfsnobody nfsnobody      673 Dec  1 23:16 ib_buffer_pool
-rw-r-----. 1 nfsnobody nfsnobody 12582912 Dec  1 23:16 ibdata1
-rw-r-----. 1 nfsnobody nfsnobody  8388608 Dec  1 23:16 ib_logfile0
-rw-r-----. 1 nfsnobody nfsnobody  8388608 Dec  1 23:16 ib_logfile1
-rw-r-----. 1 nfsnobody nfsnobody 12582912 Dec  1 23:17 ibtmp1
drwxr-x---. 2 nfsnobody nfsnobody     4096 Dec  1 23:16 mysql
-rw-r-----. 1 nfsnobody nfsnobody        2 Dec  1 23:16 mysql.pid
-rw-r--r--. 1 nfsnobody nfsnobody        6 Dec  1 23:16 mysql_upgrade_info
drwxr-x---. 2 nfsnobody nfsnobody     8192 Dec  1 23:16 performance_schema
-rw-------. 1 nfsnobody nfsnobody     1680 Dec  1 23:16 private_key.pem
-rw-r--r--. 1 nfsnobody nfsnobody      452 Dec  1 23:16 public_key.pem
-rw-r--r--. 1 nfsnobody nfsnobody     1112 Dec  1 23:16 server-cert.pem
-rw-------. 1 nfsnobody nfsnobody     1676 Dec  1 23:16 server-key.pem
drwxr-x---. 2 nfsnobody nfsnobody     8192 Dec  1 23:16 sys
drwxr-x---. 2 nfsnobody nfsnobody       20 Dec  1 23:16 wp_db

创建 wordpress 服务

1. Registry 上下载 wordpress 镜像，并导入到本地镜像仓库

# ssh registry.example.com
# docker pull wordpress
# docker tag docker.io/wordpress:latest registry.example.com/wordpress:latest
# docker push registry.example.com/wordpress:latest

2. 创建 pod-wp.yaml，内容如下

apiVersion: v1
kind: Pod
metadata:
  name: wordpress
  labels:
    name: wordpress
spec:
  containers:
    - image: registry.example.com/wordpress:latest
      name: wordpress
      env:
        - name: WORDPRESS_DB_USER
          value: wp_user
        - name: WORDPRESS_DB_PASSWORD
          value: wp_pass
        - name: WORDPRESS_DB_NAME
          value: wp_db
        - name: WORDPRESS_DB_HOST
          value: mysql
      ports:
        - containerPort: 80
          name: wordpress
      volumeMounts:
        - name: wordpress-persistent-storage
          mountPath: /var/www/html
  volumes:
    - name: wordpress-persistent-storage
      persistentVolumeClaim:
       claimName: claim-wp

3. 执行 pod-wp.yaml，创建 wordpress 容器

# oc create -f pod-wp.yaml

4. 创建 svc-wp.yaml，内容如下

apiVersion: v1
kind: Service
metadata:
  labels:
    name: wp
  name: wp
spec:
  ports:
    - port: 8080
      protocol: TCP
      targetPort: 8080
  selector:
    name: wordpress

5. 创建路由使wordpress 外部可见

# oc expose svc/wp --hostname=wp.apps.example.com

6. 查看运行的服务

# oc get pods
NAME        READY     STATUS    RESTARTS   AGE
mysql       1/1       Running   0          22m
wordpress   1/1       Running   2          5m

7. 查看 NFS 服务器端导出的文件

# ssh nfs.example.com 'ls -la /var/export/data/wp'
total 196
drwx------.  5 nfsnobody nfsnobody  4096 Dec  1 23:33 .
drwxr-xr-x.  4 root      root         29 Dec  1 22:50 ..
-rw-r--r--.  1 nfsnobody nfsnobody   418 Sep 25  2013 index.php
-rw-r--r--.  1 nfsnobody nfsnobody 19935 Jan  7  2018 license.txt
-rw-r--r--.  1 nfsnobody nfsnobody  7415 Mar 19  2018 readme.html
-rw-r--r--.  1 nfsnobody nfsnobody  5458 May  2  2018 wp-activate.php
drwxr-xr-x.  9 nfsnobody nfsnobody  4096 Aug  3 04:39 wp-admin
-rw-r--r--.  1 nfsnobody nfsnobody   364 Dec 19  2015 wp-blog-header.php
-rw-r--r--.  1 nfsnobody nfsnobody  1889 May  3  2018 wp-comments-post.php
-rw-r--r--.  1 nfsnobody nfsnobody  3144 Dec  1 23:33 wp-config.php
-rw-r--r--.  1 nfsnobody nfsnobody  2764 Dec  1 23:33 wp-config-sample.php
drwxr-xr-x.  4 nfsnobody nfsnobody    52 Aug  3 04:39 wp-content
-rw-r--r--.  1 nfsnobody nfsnobody  3669 Aug 20  2017 wp-cron.php
drwxr-xr-x. 18 nfsnobody nfsnobody  8192 Aug  3 04:39 wp-includes
-rw-r--r--.  1 nfsnobody nfsnobody  2422 Nov 21  2016 wp-links-opml.php
-rw-r--r--.  1 nfsnobody nfsnobody  3306 Aug 22  2017 wp-load.php
-rw-r--r--.  1 nfsnobody nfsnobody 37794 Jul 16 22:14 wp-login.php
-rw-r--r--.  1 nfsnobody nfsnobody  8048 Jan 11  2017 wp-mail.php
-rw-r--r--.  1 nfsnobody nfsnobody 16246 Oct  4  2017 wp-settings.php
-rw-r--r--.  1 nfsnobody nfsnobody 30091 Apr 30  2018 wp-signup.php
-rw-r--r--.  1 nfsnobody nfsnobody  4620 Oct 24  2017 wp-trackback.php
-rw-r--r--.  1 nfsnobody nfsnobody  3065 Sep  1  2016 xmlrpc.php

部署 wordpress