Docker Compose 是什么
docker compose 通过docker-compose.yml是将多个服务(即容器)构建成一个项目,来完成某个需求。
Compose 的默认管理对象是项目,通过子命令对项目中的一组容器进行便捷地生命周期管理。
Docker Compose 安装
安装epl 软件源
yum install -y epel-release
安装python-pip
yum install -y python-pip
安装Docker Compose
pip install docker-compose
查看Docker Compose 版本
docker-compose version
root@MiWiFi-R3-srv ~]# docker-compose version
docker-compose version 1.22.0, build f46880f
docker-py version: 3.5.0
CPython version: 2.7.5
OpenSSL version: OpenSSL 1.0.2k-fips 26 Jan 2017
Docker Compose 项目构建
通过Docker compose file 构建 wordpress 应用
编写 wordpress docker compose file 文件
新建wordpress 文件夹,并切换进入wordpress文件夹
[root@localhost ~]# mkdir wordpress
[root@localhost ~]# cd wordpress/
[root@localhost wordpress]# ll
总用量 0
[root@localhost wordpress]# pwd
/root/wordpress
新建wordpress docker compose file 文件
文件名:docker-compose.yml
version: "3"
services:
db:
image: mysql:latest
volumes:
- db_data:/var/lib/mysql
restart: always
environment:
MYSQL_ROOT_PASSWORD: somewordpress
MYSQL_DATABASE: wordpress
MYSQL_USER: wordpress
MYSQL_PASSWORD: wordpress
wordpress:
depends_on:
- db
image: wordpress:latest
ports:
- "80:80"
restart: always
environment:
WORDPRESS_DB_HOST: db:3306
WORDPRESS_DB_USER: wordpress
WORDPRESS_DB_PASSWORD: wordpress
volumes:
db_data:
Docker compose file 字段解析
version:声明构建项目的版本号
services:声明此项目有几个服务(容器)构成
db、wordpress: 服务名称
image: 镜像名称(默认来自于docker官方镜像仓库)
mysql image 官方地址
wordpress image 官方地址
volumes: 挂载主机目录到此服务中并给此目录命名
使用命名卷必须先在首层docker file 文件中声明restart: 服务异常后的重启方式
environment: 需要添加什么变量根据官方镜像说明添加
ports: 主机端口和服务端口的映射关系
启动wordpress docker compose 项目构建
docker-compose up -d
构成成功后的wordpress
wordpress 安装成功后的界面
Docker compose 命令使用
Docker compose 指令必须在含有docker-compose.yml或者 docker-compose.yaml的目录执行
查看compose 文件含有的镜像
docker-compose images
[root@localhost wordpress]# docker-compose images
Container Repository Tag Image Id Size
-------------------------------------------------------------------
wordpress_db_1 mysql latest 29e0ae3b69b9 462 MB
wordpress_wordpress_1 wordpress latest e2c4085bbc2b 389 MB
列出项目中所有的容器
docker-compose ps
[root@localhost wordpress]# docker-compose ps
Name Command State Ports
------------------------------------------------------------------------------------
wordpress_db_1 docker-entrypoint.sh mysqld Up 3306/tcp, 33060/tcp
wordpress_wordpress_1 docker-entrypoint.sh apach ... Up 0.0.0.0:80->80/tcp
停止项目中正在运行的容器
docker-compose stop
[root@localhost wordpress]# docker-compose stop
Stopping wordpress_wordpress_1 ... done
Stopping wordpress_db_1 ... done
删除项目中所有停止的容器
docker-compose rm
[root@localhost wordpress]# docker-compose rm
Going to remove wordpress_wordpress_1, wordpress_db_1
Are you sure? [yN] y
Removing wordpress_wordpress_1 ... done
Removing wordpress_db_1 ... done
构建项目镜像并启动
docker-compose up -d
[root@localhost wordpress]# docker-compose up -d
Creating wordpress_db_1 ... done
Creating wordpress_wordpress_1 ... done
启动compose 项目中的容器
docker-compose start
[root@localhost wordpress]# docker-compose start
Starting db ... done
Starting wordpress ... done
指定项目中容器的启动数量
docker-compose scale wordpress=3 db=2
[root@localhost wordpress]# docker-compose scale wordpress=3 db=2
WARNING: The scale command is deprecated. Use the up command with the --scale flag instead.
Creating wordpress_db_1 ... done
Creating wordpress_db_2 ... done
Creating wordpress_wordpress_1 ... done
Creating wordpress_wordpress_2 ... done
Creating wordpress_wordpress_3 ... done
查看项目中服务对应绑定的端口号
docker-compose port wordpress 80
[root@localhost wordpress]# docker-compose port wordpress 80
0.0.0.0:80
查看项目中服务的日志信息
docker-compose logs -f wordpress
[root@localhost wordpress]# docker-compose logs -f wordpress
Attaching to wordpress_wordpress_1
wordpress_1 | WordPress not found in /var/www/html - copying now...
wordpress_1 | Complete! WordPress has been successfully copied to /var/www/html
wordpress_1 | AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 172.20.0.3. Set the 'ServerName' directive globally to suppress this message
wordpress_1 | AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 172.20.0.3. Set the 'ServerName' directive globally to suppress this message
wordpress_1 | [Sun Aug 19 07:13:26.743777 2018] [mpm_prefork:notice] [pid 1] AH00163: Apache/2.4.25 (Debian) PHP/7.2.8 configured -- resuming normal operations
wordpress_1 | [Sun Aug 19 07:13:26.743842 2018] [core:notice] [pid 1] AH00094: Command line: 'apache2 -D FOREGROUND'