add Docker support

[OmgImAlexis]

To use this you need to run docker-compose up -d --build in the repo directory.

This will setup caddy to proxy the static files, mongodb and the Amon process.

To change the domain used you'll need to edit the Caddyfile with your domain and make sure to add that mount point in the docker-compose.yml for /etc/opt/amon/amon.yml.

Closes #172

[martinrusev]

To summarize why this request will not be merged in Amon for the time being. The following is operated through cron jobs

• Cloud sync - pulls servers from the different cloud providers every 5 minutes
• Alerts & Notifications - goes over the data each minute and sends notifications when an alert condition is met

This container will run the django app and the UI, but will not have the functionality above

[OmgImAlexis]

What's the point of adding a comment stating what needs to be fixed and then just closing it?

Adding cron is super simple just add another container like this to handle the cron jobs.

[martinrusev]

@OmgImAlexis Not going to fix it. If we add 1 more container, we will have a total of 3 - 1 for Amon, 1 for Mongo and 1 for cron, which at this point is deep into container management territory.

[OmgImAlexis]

That's how docker compose works though.. You don't need to maintain anything apart from the containers you build which would just be amon and the cron container.

Seems more like you're just personally against using containers?

[martinrusev]

@OmgImAlexis I know very well how docker works, this is how I earn a living. You said it right there You don't need to maintain anything apart from the containers you build.

[lkstz]

I just read this thread. Did I get it right, that amon won't offer a Dockerfile for on-premise hosting, which contains the amon Django app, or was this PR closed because the compose and caddy stuff?

[martinrusev]

@kolletzki Docker support can still happen in the near future. A Dockerfile is not sufficient, because it opens a new layer of issues and support requests. The better approach is to have an automated docker build pipeline on release, similar to https://github.com/getsentry/docker-sentry/

In this case, as a user, you just do docker pull amon/amon and then docker run the appropriate containers.

As for Docker Compose, I would not recommend it for cases where you have a database involved, because you need to add 1 more layer of bash scripts to check whenever the DB is up and running (https://docs.docker.com/compose/startup-order/)

For Caddy - don't know much about that server. I know that they tried to monetize by shoving ads in the headers. Don't know what happened next. Can not stand behind or support a project like that.

[lkstz]

Thanks for the clarification! I've created #190 to keep track of this.