Docker-compose

Brief

The most easier way to keep config resources for running containers.

Original documentation

Limitations

• Can not migrate containers between hosts
• Haven't clusters features
• Haven't scale features

Tips

Run containers as daemon

$ docker-compose up -d

Run containers with build

$ docker-compose up --build -d

Run container as temp

$ docker-compose run <name_of_service>

Labels

That an important feature. Because can easy to find required container. Also traefik can operate with LABELS defined on docker-compose file.

...
labels:
- stage=production
- version=${GIT_SHA}
- traefik.http.routers.josh-production.rule=Host(`example.com`)
- traefik.http.routers.josh-production.tls=true
...

As an example:

docker ps --filter label=stage=production --format {{.ID}} --all
18672fd97e94

Command

The various elegant ways to run multilines script

• Use an entrypoint

  ...
  image: alpine:latest
  entrypoint: ["sh", "-c"]
  command:
  - |
     VAR1=$$(echo 1)
     echo $${VAR1}
  ...
  

• Use the pure command

  ...
  image: alpine:latest
  command: >
    sh -c "VAR1=$$(echo 1)
           echo $${VAR1}"
  ...
  

• Use the pure command

  ...
  image: alpine:latest
  command:
  - sh 
  - -c 
  - |
     VAR1=$$(echo 1)
     echo $${VAR1}
  ...