depends_on is deprecated in docker-compose v3

[Koschi13]

depends_on does not longer wait for the container to be "ready" instead it will wait for it to be started. To make sure a container is ready one should have a try again loop.

I experienced issues when deploying this, with the deploy script:

services.pgadmin.depends_on must be a list

I don't know why nobody else had this problem, but for me everything works fine when removing the depends_on lines. This seems to be the expected behavior as stated in the docs:

There are several things to be aware of when using depends_on:

• depends_on does not wait for db and redis to be “ready” before starting web - only until they have been started. If you need to wait for a service to be ready, see Controlling startup order for more on this problem and strategies for solving it.
• Version 3 no longer supports the condition form of depends_on.
• The depends_on option is ignored when deploying a stack in swarm mode with a version 3 Compose file.

Did someone else had this problem? Is it save to remove the depends_on lines?

[jackleeforce]

i just got this issue a few minitus ago, how to fix it ?

services.backend.depends_on must be a list

[Koschi13]

i just got this issue a few minitus ago, how to fix it ?

services.backend.depends_on must be a list

You have to delete all depends_on in your docker-compose.yml. As far as I know the are not mandatory for running :)

[haviduck]

using dc 3.7 and is working fine here. was not able to reproduce with 3.3 either.

[Koschi13]

ok, what are your versions, mine are:

• docker: Docker version 19.03.12, build 48a66213fe
• docker-compose: docker-compose version 1.27.3, build unknown
• system: Linux 4.15.0-117-generic #118-Ubuntu SMP Fri Sep 4 20:02:41 UTC 2020

[jackleeforce]

i just got this issue a few minitus ago, how to fix it ?

services.backend.depends_on must be a list

You have to delete all depends_on in your docker-compose.yml. As far as I know the are not mandatory for running :)

thanks,it works fine for me:)

[kmatarese]

Same problem here. Running on a mac, versions for reference:

Docker:

Server: Docker Engine - Community
 Engine:
  Version:          19.03.13
  API version:      1.40 (minimum version 1.12)
  Go version:       go1.13.15
  Git commit:       4484c46d9d
  Built:            Wed Sep 16 17:07:04 2020
  OS/Arch:          linux/amd64
  Experimental:     true

Docker Compose:

docker-compose version 1.27.4, build 40524192

Removing depends_on works around the issue for me too.

[mulder999]

Long syntax does not not seems deprecated according to latest docker compose specification but clearly not implemented with docker stack for me either. Only the short syntax is working.

[Ren22]

following as docker stack seems to be missing Long syntax indeed

[diegobill]

The depends_on option is ignored when deploying a stack in swarm mode with a version 3 Compose file.

Reference: https://docs.docker.com/compose/compose-file/compose-file-v3/#depends_on

[tiangolo]

This was handled a while ago, so I'll close this. ☕