Docker startup getting stuck on mysqladmin ping

[ZetaTwo]

Environment:

• CTFd Version/Commit: ctfd/ctfd:latest from Docker hub (17 days old)
• Operating System: Amazon Linux AMI 2017.09.j x86_64 ECS HVM GP2
• Web Browser and Version: N/A

What happened?

Trying to setup CTFd with AWS ECS and RDS Aurora.
If I don't set the DATABASE_URL env variable, it works fine and starts.
If I do set the DATABASE_URL to mysql+pymysql://ctfd:@CTFd.i.eu-west-1.rds.amazonaws.com/ctfd I get stuck on docker-entrypoint.sh:7 while ! mysqladmin ping -h db --silent; do

What did you expect to happen?

That the ping should succeed and startup continue

How to reproduce your issue

Create an ECS task with ctfd/ctfd as image source, set env variable SECRET_KEY and DATABASE_URL. Start container.

I have made sure the container can access the database by running docker exec container-id mysql -h ctfd.<resource-id>.eu-west-1.rds.amazonaws.com -p<SECRET PASSWORD> which works.

Any associated stack traces or error logs

Just stuck on "Waiting on MySQL"

My question is basically: am I doing something wrong and should somehow make that "db" resolve to the database or is the script incorrect and should take the value of DATABASE_URL into account?

[ColdHeat]

Sorry I missed this issue. Within docker-compose each of the containers (including the db) get a hostname related to the service.

I think we should be taking into account the DATABASE_URL value.

If you have the time a PR would be great!