简介

官方文档：https://docs.docker.com/compose/

Compose is a tool for defining and running multi-container Docker applications. With Compose, you use a YAML file to configure your application’s services. Then, with a single command, you create and start all the services from your configuration.

Using Compose is basically a three-step process:

  1. Define your app’s environment with a Dockerfile so it can be reproduced anywhere.
  2. Define the services that make up your app in docker-compose.yml so they can be run together in an isolated environment.
  3. Run docker compose up and the Docker compose command starts and runs your entire app. You can alternatively run docker-compose up using the docker-compose binary.

可以理解为容器编排的工具

安装

官方文档：https://docs.docker.com/compose/install/

  1. #官方的很慢
  2. sudo curl -L "https://github.com/docker/compose/releases/download/1.29.1/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
  4. #可以网上找一个
  5. sudo curl -L "https://github.com/docker/compose/releases/download/1.28.5/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
  7. #设置权限
  8. chmod +x /usr/local/bin/docker-compose
  10. #验证安装是否成功
  11. docker-compose --version

尝试

也可以参考harbor部署。
官方文档有一个例子：https://docs.docker.com/compose/gettingstarted/
完成前4步之后

  1. (base) [root@izuf64eqyhnvmcv50ay73gz ~]# curl localhost:5000
  2. Hello World! I have been seen 1 times.
  3. (base) [root@izuf64eqyhnvmcv50ay73gz ~]# curl localhost:5000
  4. Hello World! I have been seen 2 times.

分析一下
默认容器名/服务名：
composetestredis_1和composetest_web_1
当前文件夹名服务名_副本数

  1. (base) [root@izuf64eqyhnvmcv50ay73gz ~]# docker ps -n=2
  2. CONTAINER ID   IMAGE             COMMAND                  CREATED         STATUS         PORTS                    NAMES
  3. fa9c372da6c3   redis:alpine      "docker-entrypoint.s…"   3 minutes ago   Up 3 minutes   6379/tcp                 composetest_redis_1
  4. 9016f9804b0f   composetest_web   "flask run"              3 minutes ago   Up 3 minutes   0.0.0.0:5000->5000/tcp   composetest_web_1
  5. (base) [root@izuf64eqyhnvmcv50ay73gz ~]#

网络：
可以看到docker-compose给我们维护了一个叫composetest_default的自定义网络。如果执行docker-compose down关闭服务，这个网络也会消失。

  1. (base) [root@izuf64eqyhnvmcv50ay73gz ~]# docker network ls
  2. NETWORK ID     NAME                  DRIVER    SCOPE
  3. c38149fd1d59   bridge                bridge    local
  4. e2c4cd73b5ac   composetest_default   bridge    local
  5. 480762c35327   harbor_harbor         bridge    local
  6. a6d1fd635ad8   host                  host      local
  7. a88653ee6e7a   mynet                 bridge    local
  8. 580f8272eeba   none                  null      local
  9. 702358f66c15   redis                 bridge    local
  10. (base) [root@izuf64eqyhnvmcv50ay73gz ~]#

配置编写规则

docker-compose的核心：docker-compose.yml
官方文档：https://docs.docker.com/compose/compose-file/
注意看下版本，向下兼容的。

主要有几个重要部分：
version
版本，新版本docker可以兼容老版本
service
多个服务，通过服务名来访问。
结合docker run的参数来填写
可以用depends_on来设置服务启动的先后顺序
volume
数据卷设置
network
网络设置

尝试搭建WP博客

官方文档：https://docs.docker.com/samples/wordpress/