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I am fairly new to DevOps. I have managed to build myself a CI/DI pipeline for my open source project.

As soon as I check-in some code into GitHub, Travis CI takes over, it builds a fresh docker image of my code, pushes it to DockerHub, then the after_success step within my .travis.yml connects to my VPS via SSH, and runs a script on there which basically does a docker-compose down followed by a docker-compose pull && docker compose up.

All seems to be working correctly. But I have an issue with my docker-compose.yml. Right now as you can see, it has all my environmental variables. Those are considered secret information. How do I hide them from the docker-compose.yml file whilst having everything still working as before?

UPDATE

I went and created myself a variables.env file in the same directory as the docker-compose.yml. Inside the .env file, I put my old variables, for example:

Database__DefaultConnectionString: "Server=database;Port=5432;Database=bejebeje_identity;User Id=postgres;Password=admin;"

But in Travis CI I get the following error:

environment variable name 'Database__DefaultConnectionString: "Server' may not contains whitespace.

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Use environment variables on your host that are read by your docker-compose.yml file. There are a couple ways to accomplish this. One way is to create a .env file on the host that contains your variables. Docker Compose will read these variables and apply them to your configuration.

Alternatively, or in conjunction with a .env file, you can set environment variables in your shell. These variables will be applied the same way as those read from a .env file and actually take precedence.

Read more here: https://docs.docker.com/compose/environment-variables/

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  • Just to be clear, by host you mean the VPS where my sites are running? So in /var/www/html/mysite.co.uk/ I'll have a .env file with the JSON where the keys match the environmental variables that my application is expecting?
    – J86
    Commented Mar 29, 2019 at 17:57
  • Yes, the host where you execute docker-compose up will need the .env file in the current working directory. Those variables must match the variables declared in your compose file.
    – swysocki
    Commented Mar 29, 2019 at 18:44
  • Thank you for the clarification @swysocki, I'm getting an issue about whitespace! I've updated the question.
    – J86
    Commented Mar 29, 2019 at 19:43
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    Thanks, I figured it out. I was using var: value instead of var=value.
    – J86
    Commented Mar 29, 2019 at 20:34

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