docker-compose handling circular dependency

In docker-compose files you can have different keywords to indicate run time dependency. depends_on and links. The latter one is for handling network connection.

The links keyword is needed to handles how traffic is directed into one direction. depends_on and links can interfere with one another in terms of dependency. An error like this occurs when you want to run docker-compose up

Docker compose ERROR: Circular dependency between ....

It is an issue when depends_on and links disallowing the docker-compose to start the service because different resources require a service to be running.

The general solution for this problem is to disabled the links keywords and get the different services running first. In my understanding the depends_on is for the run time dependency. In sense what a service requires before it can be started:

A -> B -> C

In the sense: A requires B and therefor. But for the links it's the other way around. Who needs a connects to whom

C -> B -> A

best regards, akendo