How to specify start order

[polRk]

Like in docker-compose i can specify

depends_on:
  {{PROCESS}}:
    condition: service_started

[DarthSim]

Procfile is a very simple format that doesn't support health checks. Applications that use it can't determine the readiness of processes and thus can't make processes wait for their dependencies' readiness.

[gedw99]

Yeah I normally make each process that connects to another process have an exponential back off / retry.

mots good practice too . Never know what is going on under the covers so best to be pessimistic

[chriscz]

You could probably hack this by putting in a sleep for a few milliseconds:

web: sleep 0.5 && server start

Alternatively, there are approaches like testing if a port is open:

nc -w 0.5 ${HOSTNAME} ${PORT} < /dev/null &> /dev/null

The above uses netcat to connect to the port, waiting for 0.5 seconds at most for the connection to establish.