Docker for LAMP

这部分介绍下,如何利用Docker搭建一个便携的LAMP网络服务器。 Docker的基本使用请参考 http://blog.genesino.com//2016/07/docker/

基本使用

官方未提供LAMP的镜像,搜索了下, 发现推荐使用tutum/lamp的帖子最多,且在Docker hub上评分较高,故这里也用这个做为示例。运行docker search lamp获得其它LAMP相关镜像。

运行docker pull tutum/lamp获取LAMP镜像。

运行docker run --rm -p 8080:80 -p 3306:3306 tutum/lamp启动LAMP容器。

  • 若出现错误bind: address already in use, 则选择一个新的host_port (-p host_port:container_port)做为映射端口。

  • 因为作为测试用,所以加了--rm;若做daemon, 替换其为-d

在宿主机上再打开一个新的终端,运行curl http://127.0.0.1:8080就可以探测到LAMP镜像中运行的网页服务器了。如果有外网访问权限或设置了SSH tunnel,则可在浏览器中测试。

挂载自己的网站到LAMP镜像

  • 方法一:运用volume映射,运行docker run --rm -v /local_html/:/app -p 8080:80 tutum/lamp.

  • 方法二:运用Dockerfile新构建一个lamp

    Dockerfile内容如下 (local_html与Dockerfile在同一目录):

    FROM tutum/lamp:latest
    RUN rm -rf /app/*
    COPY local_html/* /app/
    EXPOSE 80 3306
    CMD ["/run.sh"]
    

    运行docker build -t docker_hub_username/lamp-self .创建新的映像。

    注:在我们得到一个镜像后,可以使用docker history --no-trunc=true tutum/lamp来查看这个镜像的生成历史,获得类似于Dockerfile的文件,然后增加或者覆盖想要的操作。

    IMAGE               CREATED             CREATED BY                                      SIZE                COMMENT
    3d4f934accdb        7 months ago        /bin/sh -c #(nop) CMD ["/run.sh"]               0 B                 
    aa321fa8d23f        7 months ago        /bin/sh -c #(nop) EXPOSE 3306/tcp 80/tcp        0 B                 
    6446fbfc507d        7 months ago        /bin/sh -c #(nop) VOLUME [/etc/mysql /var/lib   0 B                 
    44e98bdf2bbf        7 months ago        /bin/sh -c #(nop) ENV PHP_POST_MAX_SIZE=10M     0 B                 
    bedff16caee9        7 months ago        /bin/sh -c #(nop) ENV PHP_UPLOAD_MAX_FILESIZE   0 B                 
    72b723ccc97f        7 months ago        /bin/sh -c mkdir -p /app && rm -fr /var/www/h   0 B                 
    9bb67f3e1d7b        7 months ago        /bin/sh -c git clone https://github.com/ferma   66.45 kB            
    30aeae62f85c        7 months ago        /bin/sh -c a2enmod rewrite                      0 B                 
    18c7fa6ee534        7 months ago        /bin/sh -c #(nop) ADD file:4eacfc1aa3adff00b3   1.115 kB            
    0e6ae46b9d7a        7 months ago        /bin/sh -c chmod 755 /*.sh                      1.767 kB            
    41b57fec0232        7 months ago        /bin/sh -c #(nop) ADD file:846d81e0679354c2e3   1.122 kB            
    d1cbec592f63        7 months ago        /bin/sh -c rm -rf /var/lib/mysql/*              0 B                 
    520e2f6560c9        7 months ago        /bin/sh -c #(nop) ADD file:1b12f1071297cfbb02   84 B                
    17db5629ffc0        7 months ago        /bin/sh -c #(nop) ADD file:dadf942589f45f87e6   86 B                
    4fa78a22f055        7 months ago        /bin/sh -c #(nop) ADD file:3568f72d83e2d611e1   30 B                
    b57aa10ab85b        7 months ago        /bin/sh -c chmod 755 /*.sh                      645 B               
    438f80d6c1e7        7 months ago        /bin/sh -c #(nop) ADD file:a72b1b2b34a76805fc   549 B               
    4dfade5e9c4a        7 months ago        /bin/sh -c #(nop) ADD file:bbf77f727c38cb03a7   29 B                
    7601a98f8a03        7 months ago        /bin/sh -c #(nop) ADD file:62ecf7e0d59dfa5d60   67 B                
    0ebbbec8ac86        7 months ago        /bin/sh -c apt-get update &&   apt-get -y ins   238.9 MB            
    9fabaa35b190        7 months ago        /bin/sh -c #(nop) ENV DEBIAN_FRONTEND=noninte   0 B                 
    2c3431c1c481        7 months ago        /bin/sh -c #(nop) MAINTAINER Fernando Mayo <f   0 B                 
    8693db7e8a00        8 months ago        /bin/sh -c #(nop) CMD ["/bin/bash"]             0 B                 
    a4c5be5b6e59        8 months ago        /bin/sh -c sed -i 's/^#\s*\(deb.*universe\)$/   1.895 kB            
    c4fae638e7ce        8 months ago        /bin/sh -c echo '#!/bin/sh' > /usr/sbin/polic   194.5 kB            
    f15ce52fc004        8 months ago        /bin/sh -c #(nop) ADD file:7ce20ce3daa6af21db   187.7 MB            
    

    我们可以从运行的container中拷贝文件到宿主机,使用docker ps查看运行 中container的名字,如berserk_payne, 运行docker cp berserk_payne:run.sh .就可以拷贝run.sh文件到本地,然后相应修改。

    CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS                                            NAMES
    aeafa241a81c        tutum/lamp          "/run.sh"           About an hour ago   Up About an hour    0.0.0.0:10000->80/tcp, 0.0.0.0:10001->3306/tcp   berserk_payne       
    

    我们可以利用命令docker run --rm -it -p 8080:80 tutum/lamp bash来覆盖原来image中的CMD命令,进而进入交互式界面。

    root@a1716037e274:/# ls
    app   create_mysql_admin_user.sh  home   media  proc  run.sh
    start-apache2.sh   tmp            bin    dev    lib   mnt    
    root  sbin         start-mysqld.sh       usr    boot  etc                  lib64              opt            run    srv    sys   var
    root@a1716037e274:/# 
    

挂载外部数据库

  1. 新建数据库容器存储数据

    # 如果是跟着流程走,想偷懒的话或者系统中有其它需要依赖ubuntu image
    # 的容器,则使用ubuntu image 构建数据容器。
    docker create -v /var/lib/mysql --name test_db ubuntu
    # 也可以用docker run创建新的容器
    docker run -d -v /var/lib/mysql --name test_db ubuntu
    # 推荐使用alpine image,占用空间小,只有5M
    docker create -v /var/lib/mysql --name test_db alpine sh
    

    Note: you can change the name of the volume container, which will be used in the next step. The volume path (/var/lib/mysql) should not be changed if using mysql.

  2. 在LAMP中向test_db写入数据

    启动LAMP容器,docker run --rm --volumes-from=test_db -v /local_html/:/app -p 10000:80 -p 10001:3306 -e MYSQL_PASS="test_ali" tutum/lamp

    请注意:An empty or uninitialized MySQL volume is detected

    => An empty or uninitialized MySQL volume is detected in
    /var/lib/mysql
    => Installing MySQL ...
    => Done!
    => Waiting for confirmation of MySQL service startup
    => Creating MySQL admin user with preset password
    => Done!
    ========================================================================
    You can now connect to this MySQL Server using:
       
        mysql -uadmin -ptest_ali -h<host> -P<port>
       
    Please remember to change the above password as soon as possible!
    MySQL user 'root' has no password but only allows local connections
    ========================================================================
    /usr/lib/python2.7/dist-packages/supervisor/options.py:295:
    UserWarning: Supervisord is running as root and it is searching
    for its configuration file in default locations (including its
    current working directory); you probably want to specify a " -c"
    argument specifying an absolute path to a configuration file for
    improved security.
    'Supervisord is running as root and it is searching '
    2016-09-25 11:33:39, 807 CRIT Supervisor running as root (no
    user in config file)
    2016-09-25 11:33:39, 807 WARN Included extra file "
    /etc/supervisor/conf.d/supervisord-apache2.conf"  during parsing
    2016-09-25 11:33:39, 807 WARN Included extra file "
    /etc/supervisor/conf.d/supervisord-mysqld.conf"  during parsing
    2016-09-25 11:33:39, 844 INFO RPC interface 'supervisor'
    initialized
    2016-09-25 11:33:39, 845 CRIT Server 'unix_http_server' running
    without any HTTP authentication checking
    2016-09-25 11:33:39, 845 INFO supervisord started with pid 1
    2016-09-25 11:33:40, 848 INFO spawned: 'mysqld' with pid 432
    2016-09-25 11:33:40, 850 INFO spawned: 'apache2' with pid 433
    2016-09-25 11:33:42, 267 INFO success: mysqld entered RUNNING
    state,  process has stayed up for > than 1 seconds (startsecs)
    2016-09-25 11:33:42, 268 INFO success: apache2 entered RUNNING
    state,  process has stayed up for > than 1 seconds (startsecs)
    

    连接mysql数据库 mysql -uadmin -ptest_ali -h 127.0.0.1 -P 10001

    mysql> create database test;
    Query OK,  1 row affected (0.00 sec)
    

    加载备份的数据库 mysql -uadmin -ptest_ali -h 127.0.0.1 -P 10001 test <test.dump

  3. 再次启动LAMP容器,查看写入的数据是否已经保存。 docker run --rm --volumes-from=test_db -v /root/docker/docker-test/web/:/app -p 10000:80 -p 10001:3306 -e MYSQL_PASS="test_ali" tutum/lamp

    请注意:Using an existing volume of MySQL

    => Using an existing volume of MySQL
    2016-09-25 12:24:19, 261 CRIT Supervisor running as root (no user
            in config file)
    2016-09-25 12:24:19, 262 WARN Included extra file "
    /etc/supervisor/conf.d/supervisord-apache2.conf"  during parsing
    2016-09-25 12:24:19, 262 WARN Included extra file "
    /etc/supervisor/conf.d/supervisord-mysqld.conf"  during parsing
    2016-09-25 12:24:19, 312 INFO RPC interface 'supervisor'
    initialized
    2016-09-25 12:24:19, 312 CRIT Server 'unix_http_server' running
    without any HTTP authentication checking
    2016-09-25 12:24:19, 312 INFO supervisord started with pid 1
    2016-09-25 12:24:20, 316 INFO spawned: 'mysqld' with pid 9
    2016-09-25 12:24:20, 318 INFO spawned: 'apache2' with pid 10
    2016-09-25 12:24:21, 746 INFO success: mysqld entered RUNNING
    state,  process has stayed up for > than 1 seconds (startsecs)
     2016-09-25 12:24:21, 746 INFO success: apache2 entered RUNNING
     state,  process has stayed up for > than 1 seconds (startsecs)
    
  4. 正式运行: docker run -d --volumes-from=test_db -v /root/docker/docker-test/web/:/app -p 10000:80 -p 10001:3306 -e MYSQL_PASS="test_ali" tutum/lamp

备份数据库容器

前面,我们运行docker run -d -v /var/lib/mysql --name test_db ubuntu新建了一个数据容器,并且在mysql里面写入了数据。现在我们想把 这些数据保存起来,怎么操作?

打包提取:

docker run --rm --volumes-from=test_db \
 -v /root/docker/docker-test/:/backup ubuntu \
 tar czvf /backup/backup.tar.gz /var/lib/mysql/
# test_db: 为想要储存的数据容器名字, 必须有
# /root/docker/docker-test/: 为宿主机存储备份文件backup.tar的位置
# /backup/: 为容器ubuntu中存储backup.tar的位置
# /var/lib/mysql: 为需要打包的目录,来源于test_db

解压到新的容器:

#新建一个容器, 使用alphine,只有5M系统
docker run -v /var/lib/mysql --name test_db2 alpine sh
#解压到指定目录 /var/lib/mysql
docker run --rm --volumes-from=test_db2 \
 -v /root/docker/docker-test/:/backup ubuntu \
 bash -c "cd /var/ && tar zxvf /backup/backup.tar --strip 1"

#注意我们在打包时,tar会去除leading /, 因此解压时我们是在/var目录下
做的解压。

删除旧的数据容器:

docker rm -v test_db

多虚拟主机实现

为了实现多虚拟主机的挂载,我们使用jwilder/nginx-proxy 设置好的反向代理。

docker run -d -p 80:80 -v /var/run/docker.sock:/tmp/docker.sock \
--name=nginx-proxy jwilder/nginx-proxy

在我们运行其它虚拟主机时加上对应的域名 (域名需在DNS服务商处配置过指向 host机的IP)。

#virtual machine 1
docker run -d --volumes-from=test_db -v /root/docker_test/web/:/app \
  -e VIRTUAL_HOST=test.ehb.com -e MYSQL_PASS="test_ali" \
  --name=test-ehb tutum/lamp
#virtual machine 2
docker run -d -v /var/www/html:/app \
  -v /data/ct/ehb_result/:/app/result -e VIRTUAL_HOST=www.ehb.com \
  --name=ehb-main httpd:2.4-alpine

参考

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