Add "Play with docker" integration

[trntv]

https://medium.com/@patternrecognizer/how-to-add-a-try-in-play-with-docker-button-to-your-github-project-41cb65721e94

[alfredleo]

Looking into that problem. For play with docker to work, all docker images and the code should be already inside containers. The containers should be compiled and pushed to https://hub.docker.com. So there should be constant docker images compilation to create containers with the current code, or compilation should be done per release. Correct me if I am wrong.

[XzAeRo]

all docker images and the code should be already inside containers

correct

The containers should be compiled and pushed to https://hub.docker.com

not correct (at least not necessary), we could use a service like Gitlab too.

So there should be constant docker images compilation to create containers with the current code, or compilation should be done per release.

Yes and no. Yes, we should have image compilation (for testing and release purposes), but is not necessary for the Play With Docker (PWD) service.

Play with docker runs with docker-compose files, so there's no limitations in how we build the images. See this advanced PWD example file: https://raw.githubusercontent.com/vegasbrianc/prometheus/version-2/pwd-stack.yml and compare it to the "development" docker-compose file: https://raw.githubusercontent.com/vegasbrianc/prometheus/version-2/docker-compose.yml

Here's a diff comparing the files: https://www.diffchecker.com/r5A0IIME (left: docker-compose.yml, right: pwd-stack.yml), and you'll notice that the only differences are some volume naming changes, some defaults and most importantly, the source section, which dictates from where to fetch the data.

The problem with this is the time to test and try this stuff. If someone is willing to send a PR, I would be glad to review it.

[alfredleo]

#676 Here is the PR.
You need to wait till composer install finishes in background for PWD. Watch for CPU to go less then 10%. It takes about 140 seconds to spin up after instance run. Squashed commit history.

[alfredleo]

Will look at this once more when have some free time.