docker-compose 详解及示例代码

docker-compose使用示例

利用docker搭建一个mysql + java service + nginx，总共4个docker容器，如果采用docker run的方式一个一个容器去创建十分麻烦。为了能更高效的批量创建容器，docker推出了docker-compose工具，只需要定义一个docker-compose.yml文件即可快速搞定一组容器的创建，

mysql:
image: daocloud.io/yjmyzz/mysql-osx:latest
volumes:
- ./mysql/db:/var/lib/mysql
ports:
- 3306:3306
environment:
- MYSQL_ROOT_PASSWORD=123456
service1:
image: java:latest
volumes:
- ./java:/opt/app
expose:
- 8080
#ports:
#  - 9081:8080
links:
- mysql:default
command: java -jar /opt/app/spring-boot-rest-framework-1.0.0.jar
service2:
image: java:latest
volumes:
- ./java:/opt/app
expose:
- 8080
#ports:
#  - 9082:8080
links:
- mysql:default
command: java -jar /opt/app/spring-boot-rest-framework-1.0.0.jar
nginx1:
image: nginx:latest
volumes:
- ./nginx/html:/usr/share/nginx/html:ro
- ./nginx/nginx.conf:/etc/nginx/nginx.conf:ro
- ./nginx/conf.d:/etc/nginx/conf.d:ro
#expose:
#  - 80
ports:
- "80:80"
links:
- service1:service1
- service2:service2

内容不复杂，具体的关键字说明见本文最后的参考文章链接。

问题：这个文件放在哪里？

参见下面的目录结构：

mysql-java-nginx
├── docker-compose.yml
├── java
│  └── spring-boot-rest-framework-1.0.0.jar
├── mysql
│  └── db
└── nginx
├── conf
├── conf.d
│  └── default.conf
├── html
│  └── index.html
└── nginx.conf

创建容器：

cd mysql-java-nginx
docker-compose up

就是这么简单，一个up就搞定了所有容器的创建，up通常用于首次创建，可以观察终端实时输出的日志内容判断容器是否启动正常，如果没什么问题，直接Ctrl+C退出，然后

docker-compose start

以后台方式启动容器。　　

其它命令还有：

Commands:
build       Build or rebuild services
help        Get help on a command
kill        Kill containers
logs        View output from containers
pause       Pause services
port        Print the public port for a port binding
ps         List containers
pull        Pulls service images
restart      Restart services
rm         Remove stopped containers
run        Run a one-off command
scale       Set number of containers for a service
start       Start services
stop        Stop services
unpause      Unpause services
up         Create and start containers
migrate-to-labels Recreate containers to add labels
version      Show the Docker-Compose version information

基本上看名字就知道意思了。　　

参考文章：

https://docs.docker.com/compose/compose-file/

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