depends_on is deprecated in docker-compose v3

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?