docker-compose-yml

  • Compose YAML format has it's own versions:
Compose file format Docker Engine release
3.7 18.06.0+
3.6 18.02.0+
3.5 17.12.0+
3.4 17.09.0+
3.3 17.06.0+
3.2 17.04.0+
3.1 1.13.1+
3.0 1.13.0+
2.3 17.06.0+
2.2 1.13.0+
2.1 1.12.0+
2.0 1.10.0+
1.0 1.9.1.+
  • YAML file can be used with docker-compose command for local docker automation or..
  • With docker directly in production with Swarm (as of v1.13)
  • docker-compose --help
  • docker-compose.yml is default filename, but any can be used with docker-compose -f

Template

version: '3.1'  # if no version is specificed then v1 is assumed. Recommend v2 minimum

services:  # containers. same as docker run
  servicename: # a friendly name. this is also DNS name inside network
    image: # Optional if you use build:
    command: # Optional, replace the default CMD specified by the image
    environment: # Optional, same as -e in docker run
    volumes: # Optional, same as -v in docker run
  servicename2:

volumes: # Optional, same as docker volume create

networks: # Optional, same as docker network create

Using Compose to Build

  • Compose can also build your custom images
  • Will build them with docker-compose up if not found in cache
  • Also rebuild with docker-compose build

  • Great for complex builds that have lots of vars or build args

  • Compose file build options

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