基于Docker 搭建 wordpress

在Docker中，一般遵循一个Docker只运行一个应用，这样方便维护。

首先需要将centos 镜像pull到本地，并搭建本地yum仓库

yum仓库地址：http://192.168.2.11:8000  这里使用阿里yum和163yum都可以。

[root@node1 test]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
docker.io/centos    latest              904d6c400333         weeks ago         196.7 MB

编写Dockerfile文件

[root@node1 web-Dockerfile]# vim Dockerfile 

FROM centos
MAINTAINER hukey
RUN rm -rf /etc/yum.repos.d/*
RUN echo -e "[yum]\nname = yum\ngpgcheck = 0\nbaseurl = http://192.168.2.11:8000" > /etc/yum.repos.d/yum.repo
RUN yum install httpd php php-mysql php-mbstring -y && yum clean all
EXPOSE 80
CMD ["/usr/sbin/httpd","-f","/etc/httpd/conf/httpd.conf","-DFOREGROUND"]

尝试执行Dockerfile文件

[root@node1 web-Dockerfile]# docker build -f Dockerfile -t web:centos7 .
...
...
Step  : EXPOSE
 ---> Running in cd581ad95fb0
 ---> 368d9fc0b1ce
Removing intermediate container cd581ad95fb0
Step  : CMD /usr/sbin/httpd -f /etc/httpd/conf/httpd.conf -DFOREGROUND
 ---> Running in 34e0a903d8b5
 ---> 07d76f84111c
Removing intermediate container 34e0a903d8b5
Successfully built 07d76f84111c

docker每执行完成一行RUN 语句就会生成一个镜像文件，如果还有RUN指令执行，就会删除原来的镜像文件，并创建一个新的镜像文件，因此在编写Dockerfile时，要简练。

通过生成的镜像文件运行一个容器

[root@node1 web-Dockerfile]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
web                 centos7             07d76f84111c         minutes ago        MB
docker.io/centos    latest              904d6c400333         weeks ago         196.7 MB
[root@node1 web-Dockerfile]# docker run -d -p : -v /myweb/:/var/www/html/ --name web web:centos7 　　# -v 本机目录/myweb 挂载到容器内的/var/www/html目录

通过查看，我们已经成功的创建了一个web容器。

[root@node1 web-Dockerfile]# docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                NAMES
7d5c54ba0cf1        web:centos7         "/usr/sbin/httpd -f /"    seconds ago      Up  seconds       0.0.0.0:->/tcp   web
[root@node1 web-Dockerfile]# docker port web
/tcp -> 0.0.0.0:

测试访问：
http://192.168.2.11

web 服务已经搭建完毕，接下来是MySQL

编写Dockerfile文件，CMD运行的mysql.sh脚本，需要我们手动编写。这里开通ssh服务，方便对于数据库的管理工作

[root@node1 mysql-Dockerfile]# vim Dockerfile 

   FROM centos
   MAINTAINER hukey
   RUN rm -rf  /etc/yum.repos.d/*  && echo -e "[yum]\nname = yum\ngpgcheck = 0\nbaseurl = http://192.168.2.11:8000" > /etc/yum.repos.d/yum.repo
  4 RUN yum install mariadb-server openssh-server -y && yum clean all
  5 RUN mysql_install_db && chown -R mysql:mysql /var/lib/mysql/
  6 VOLUME /var/lib/mysql/
  7 ADD mysql.sh /mysql.sh
  8 RUN chmod 755 /mysql.sh
  9 EXPOSE 22
 10 EXPOSE 3306
 11 CMD ["/mysql.sh"]

mysql.sh 脚本内容

[root@node1 mysql-Dockerfile]# vim mysql.sh 

   #!/bin/bash
   # Author:hukey
   mysqld_safe &
   sleep
   mysqladmin -uroot password ''
   mysql -uroot -p123456 -e "GRANT ALL ON *.* TO 'root'@'%' IDENTIFIED BY '123456';FLUSH PRIVILEGES;"
   sed -i 's/UsePAM yes/UsePAM no/g' /etc/ssh/sshd_config && ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key
   echo  | passwd --stdin root
   /usr/sbin/sshd -D

尝试生成镜像

[root@node1 mysql-Dockerfile]# docker build -f Dockerfile -t mariadb:centos7 .
[root@node1 mysql-Dockerfile]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
mariadb             centos7             49b88fcfb709         seconds ago      367.8 MB

生成完成，尝试启动容器

[root@node1 mysql-Dockerfile]# docker run -d -p : --name db mariadb:centos7
[root@node1 mysql-Dockerfile]# docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                             NAMES
c0988d8c8eb2        mariadb:centos7     "/mysql.sh"               seconds ago       Up  seconds        /tcp, 0.0.0.0:->/tcp   db

通过ssh服务连接到容器

[root@node1 mysql-Dockerfile]# ssh 192.168.2.11 -p
The authenticity of host '[192.168.2.11]:20002 ([192.168.2.11]:20002)' can't be established.
RSA key fingerprint is 8c:c0:c0:a5:1e:0b::::1e::::::bc.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '[192.168.2.11]:20002' (RSA) to the list of known hosts.
root@192.168.2.11's password:
[root@c0988d8c8eb2 ~]# mysql -uroot -p123456
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is
Server version: 5.5.-MariaDB MariaDB Server

Copyright (c) , , Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| test               |
+--------------------+
 rows in set (0.00 sec)

现在web容器和mariadb容器已经搭建完毕，接下来就需要将它们关联在起来

[root@node1 mysql-Dockerfile]# docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                             NAMES
c0988d8c8eb2        mariadb:centos7     "/mysql.sh"               minutes ago       Up  minutes        /tcp, 0.0.0.0:->/tcp   db
7d5c54ba0cf1        web:centos7         "/usr/sbin/httpd -f /"    minutes ago      Up  minutes       0.0.0.0:->/tcp                web
[root@node1 mysql-Dockerfile]# docker stop web
web
[root@node1 mysql-Dockerfile]# docker rm web
web

测试是否能够访问到mysql容器

[root@node1 mysql-Dockerfile]# docker run -it -p : --link=db --name web web:centos7 /bin/bash

[root@f310c805bdfc /]# yum install mariadb -y
[root@f310c805bdfc /]# mysql -uroot -p123456 -h db
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is
Server version: 5.5.-MariaDB MariaDB Server

Copyright (c) , , Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| test               |
+--------------------+
 rows in set (0.00 sec)

连接mysql容器成功。

再次创建后台运行的web容器

[root@node1 web-Dockerfile]# docker run -d -p : -v /myweb/:/var/www/html/ --link=db:todb --name=web web:centos7
[root@node1 web-Dockerfile]# docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                             NAMES
4a36ee3781da        web:centos7         "/usr/sbin/httpd -f /"    seconds ago       Up  seconds        0.0.0.0:->/tcp                web
50dba9d34f51        mariadb:centos7     "/mysql.sh"               minutes ago       Up  minutes        /tcp, 0.0.0.0:->/tcp   db

安装wordpress web程序

[root@node1 myweb]# cp -a /root/wordpress/* /myweb/

浏览器访问

登录数据库容器，创建wordpress所需数据库。

[root@node1 myweb]# ssh 192.168.2.11 -p
root@192.168.2.11's password:
[root@50dba9d34f51 ~]# mysql -uroot -p123456
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is
Server version: 5.5.-MariaDB MariaDB Server

Copyright (c) , , Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> CREATE DATABASE wordpress;
Query OK,  row affected (0.09 sec)

MariaDB [(none)]> GRANT ALL ON wordpress.* TO 'wordpress'@'%' IDENTIFIED BY 'wordpress';
Query OK,  rows affected (0.03 sec)

MariaDB [(none)]> FLUSH PRIVILEGES;
Query OK,  rows affected (0.02 sec)

MariaDB [(none)]> Bye

到此，基于Docker lamp平台的wordpress搭建成功。

如果是在生产环境中使用docker，不太建议将数据库程序存放与docker内执行。建议MySQL 实现负载或者冗余。