Templating engine for docker compose

lyoko@lemm.ee to Selfhosted@lemmy.world – 12 points –

Maybe this is a little bit off-topic. I would like to ask how you manage your dockerfile.

I have a git repo hosting my configurations (docker-compose, traefik, etc). Then, I have a python script that reads data from JSON, renders the placeholder inside these files (the {{replace_me}}) by an actual value and outputs them to another directory. Finally, I cd to that directory and run docker-compose up -f .... (This approach takes inspiration from the terraform templatefile)

That JSON file is generated by some terraform code, along with terraform code for other stuffs (storage bucket, vps, dns, etc).

It works well for me so far. Especially for:

  • templating traefik toml configuration (I like it a lot more than the label approach).
  • secret in the docker env file (so my docker.env file has the form of secrect={{secret}}.

I know most templating docker part can be replaced by directly interpolating with environment variables but I don't really like it because it seems environment variables are not persistent.

Do you have any suggestions for my workflow ? I am always feel a litte bit off about this approach.

Edit: Thank you for your suggestions. I will try k8s for edge computing and if it does not work really well, I will stick with my current approach.

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Here is an ansible role that will create a compose file using variables passed in. ironicbadger/ansible-role-docker-compose-generator

I tried this but ended up using ansible directly to manage my containers.

I dont think Ansible is a general templating engine ? I do templating for all most everything and not only docker compose, for example this for traefik configuration.

fwiw Ansible uses Jinja under the hood, which itself is a templating engine.

That sounds like what I need. Thank you very much !