docker-compose: assign different values to the same environment variables for each container in a service -


my problem

i start few containers of same service, each different value same environment variables, @ arbitrary scale.

code

consider following docker-compose service stanza:

bidder:     image: whoever/whatever     environment:       - role=...

in system each bidder container reads role environment variable @ initialization, , initializes accordingly (mainly, fetches role configuration specific url , registers being role-owner in service discovery system).

in production, kubernetes solves problem assigning proper env vars each container. in dev/testing, have docker-compose assign different value role key each container. can live consecutive ids, e.g. role-1, role-2, not arbitrary strings container ids.

my question

how can configure docker-compose assign different values same environment variable different instances within same service?


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