How to pass environment variable to docker-compose up

You have two options:

1. Create the .env file as already suggested in another answer.

2. Prepend KEY=VALUE pair(s) to your docker-compose command, e.g:

   KB_DB_TAG_VERSION=kb-1.3.20-v1.0.0 docker-compose up
   

   Exporting it earlier in a script should also work, e.g.:

   export KB_DB_TAG_VERSION=kb-1.3.20-v1.0.0
   docker-compose up