run st2 with docker-compose, failed to connect to mongo

[gudan803]

rabbitmq/mongo/redis are running OK, but st2 apps are always restarting.

[gudan803]

database st2 failed to initialize

[arm4b]

Do you have any custom changes in st2.conf or docker-compose? or is it a default config

Also check the docker networking and if mongo hos is available from the st2 containers.
Worth checking the MongoDB logs too if the DB started with any issues.