How to pass docker volume name to docker compose.yml

General Discussions
1

I know needed volume name

sudo docker volume ls
...
cfc151dc475be39535b438d54d245107c5f1ce022622a0eae53bc03016aa987d

And I want to pass this volume (but with opportunity to changing it in command line) to docker compose file.

nginx:
  image: "nginx:alpine"
  ports:
    - 6000:80
  links:
    - registry:registry
  volumes:
    - ./auth:/etc/nginx/conf.d
    - ./auth/nginx.conf:/etc/nginx/nginx.conf:ro
    - ./auth/domain.crt:/etc/ssl/certs/nginx-selfsigned.crt:ro
    - ./auth/domain.key:/etc/ssl/private/nginx-selfsigned.key:ro

registry:
  image: 5money:latest
    volumes:
    - registry-external-data:/var/lib/registry

volumes:
  registry-external-data:
    external: true
    ??name: $data??

I donā€™t understand last line in composer file, what is correct? I want start compose something like this:

sudo docker-compose -f 5money-compose.yml up -d -e data=cfc151dc475be39535b438d54d245107c5f1ce022622a0eae53bc03016aa987d
2
  • docker-compose up does not have -e to set environment variables
  • docker-compose run has but those variables will be available by a process in the running container not by the yaml parser
  • You can use variables in the docker-compoye.yml if you create a file named .env next to the docker-compose.yml to set the variable like:
    data=cfc151dc475be39535b438d54d245107c5f1ce022622a0eae53bc03016aa987d

You could also ā€œrenameā€ the volume. I mean copy and delete the original. I created some scripts for Docker years ago. I tried docker-volume-copy now and still works. GitHub - itsziget/scripts-for-docker: Useful scripts you can use with Docker to save some time

docker-volume-copy cfc151dc475be39535b438d54d245107c5f1ce022622a0eae53bc03016aa987d registry-external-data

Then you could know what that volume is when you run docker volume ls. Obviously you would have to change the value of the variable.

3

Cool, this is great scripts. And thank you, Iā€™m understand about -e parameters to composer. But Iā€™m still confused - what correct last line in compose file? Iā€™m not sure about ā€œnameā€ - is this correct?

4

The last line is correct except those question marks, but I am sure those are not in the original compose file.

5

Donā€™t use links, they have been deprecated

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