Docker Compose

链接和运行docker容器集群, 我们使用Docker Compose.

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

Docker compose is usually installed when you install docker. So to simply check if you have it installed, run

$ docker-compose

You should see a list of commands from docker-compose. If not, you can go through the installationhere

Note: Ensure that you have docker-compose version 1.6 and above by runningdocker-compose -v

在根目录下创建文件docker-compose.yml.

$ touch docker-compose.yml

Our directory tree should now look like this.

.
├── angular-client
├── docker-compose.yml
└── express-server

Then edit thedocker-compose.ymlfile

mean-docker/docker-compose.yml

version: '2' # specify docker-compose version

# Define the services/containers to be run
services:
  angular: # name of the first service
    build: angular-client # specify the directory of the Dockerfile
    ports:
      - "4200:4200" # specify port forewarding

  express: #name of the second service
    build: express-server # specify the directory of the Dockerfile
    ports:
      - "3000:3000" #specify ports forewarding

  database: # name of the third service
    image: mongo # specify image to build container from
    ports:
      - "27017:27017" # specify port forewarding

Thedocker-compose.ymlfile is a simple configuration file telling docker compose which continers to build. That's pretty much it.

Now, to run containers based on the three images, simply run

$ docker-compose up

This will build the images if not already built, and run them. Once it's running, and your terminal looks something like this.

You can visit all the three apps,http://localhost:4200,http://localhost:3000ormongodb://localhost:27017, and you'll see that all the three containers are running.