container start and ready order enforcement

[ML-TANGO]

Using docker-compose.yaml and docker-compose command, we can start order of two or more containers, but it does not guarantee the readiness of the dependent container prior to start next container.

Followings are stackoverflow articles related to this issue:

• [Docker-Compose: how to wait for other service to be ready?]
• Docker Compose wait for container X before starting Y
• Difference between links and depends_on in docker_compose.yml
• How can I wait for a docker container to be up and running?
• Docker Compose Wait til dependency container is fully up before launching
• depends_on doesn't wait for another service in docker-compose 1.22.0

[ML-TANGO]

If project manager does not work, please use following process for temporary solution.
The main reason is the dependent postgresql service container is running but not in readiness when the project_manager service contianer starts.

# check all continers list
$ docker ps -a 

# if some container got into problem such as EXIT or RESTART, please down all TANGO containers
$ docker-compose down

# and restart all the componets 
$ docker-compose up -d