CODEWITHSUNDEEP
linuxdockerubuntudocker-composeenvironment-variables
LeXxyIT
LeXxyIT

Reputation: 204

docker-compose can't use variables from .env

Docker Compose can't use variables from .env in docker-compose.yml. .env located in the same directory as docker-compose.yml.

.env:

port:3306

docker-compose.yml:

ports:
    - ${port}:${port}

The documentation shows exactly the same example and says that it works

web:
    image: "webapp:${TAG}"

I have error while executing docker-compose up

WARNING: The port variable is not set. Defaulting to a blank string.
ERROR: The Compose file './docker-compose.yml' is invalid because:
services.mariadb.ports is invalid: Invalid port ":", should be [[remote_ip:]remote_port[-remote_port]:]port[/protocol]

How to fix it?

Upvotes: 1

Views: 466

Answers (2)

Mathieu
Mathieu

Reputation: 9619

From https://docs.docker.com/compose/env-file/:

Syntax rules

These syntax rules apply to the .env file:

  • Compose expects each line in an env file to be in VAR=VAL format.
  • Lines beginning with # are processed as comments and ignored.
  • Blank lines are ignored.
  • There is no special handling of quotation marks. This means that they are part of the VAL.

in .env, use = instead of :

Upvotes: 1

Max Ivanov
Max Ivanov

Reputation: 6561

It seems your .env format is wrong. Try:

PORT = 3306

Upvotes: 1

Related Questions