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Shared Volumes Question (lazysoci.al)

submitted 6 months ago* (last edited 6 months ago) by [email protected] to c/[email protected]

4 comments fedilink hide all child comments

If I have

version: "3.8"

services: 
  example1:
    image: example.com/example1:latest
  ports: 8000:80
volumes: 
  - shared_example:/data
services: 
  example2:
    image: example.com/example2:latest
  ports: 8080:80
volumes: 
  - shared_example:/data

volumes:
  shared_example: 
    driver_opts: 
      type: nfs
      o: "192.100.1.100, nolock,soft,rw"
      device: ":/local/shared"

Will that slow things down or is the proper solution to have

volumes:
  shared_example1: 
    driver_opts: 
      type: nfs
      o: "192.100.1.100, nolock,soft,rw"
      device: ":/local/shared"
  shared_example2: 
    driver_opts: 
      type: nfs
      o: "192.100.1.100, nolock,soft,rw"
      device: ":/local/shared"

Or even

volumes:
  shared_example1:
  shared_example2: 
    driver_opts: 
    type: nfs
      o: "192.100.1.100, nolock,soft,rw"
      device: ":/local/shared"

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[–] [email protected] 2 points 6 months ago* (last edited 6 months ago) (1 children)

I don't know if you had any issue with the formatting, but your first example is not going to work because you are putting the volumes mapping at the top-level. The correct would be:

version: "3.8"

services: 
  example1:
    image: example.com/example1:latest
    ports: "8000:80"
    volumes: 
      - shared_example:/data

  example2:
    image: example.com/example2:latest
    ports: "8080:80"
    volumes: 
      - shared_example:/data

volumes:
  shared_example: 
    driver_opts: 
      type: nfs
      o: "192.100.1.100, nolock,soft,rw"
      device: ":/local/shared"

[–] [email protected] 1 points 6 months ago

Thank you. That's what I get for trying to write YAML on my phone.

[–] [email protected] 1 points 6 months ago (1 children)

Pretty sure you only want to define it once?

You create a volume, then map the mount into each service which needs to access it.

I am unsure whether there is performance differences? But the second one looks “wrong”

specific example on sharing data between containers https://www.baeldung.com/ops/docker-share-volume-multiple-containers

[–] [email protected] 1 points 6 months ago

Sometimes I get anxious and overthink things. Thank you