How To Use Environment Variables In Docker Compose File

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Environment variables work great with docker compose. If I want to use different credentials on different servers, environment variables can be used. Credentials to redis-commander will be admin/qwerty. The environment variables get picked up automatically when running " docker-compose up -d", there is no need to specify it somehow. If I create.env file next to my yml file and put the following inside, credentials to test/1234: REDIS_USER=test; Redis_PASSWORD=1234.