Current deployment flow
vs
Docker deployment flow
Something is pushed to alpha/staging/master
Gitlab Runner gets new changes
Gitlab Runner Uses DPL https://github.com/travis-ci/dpl - tool which copies the project to the Heroku
Heroku creates environment from scratch (install gems, npm), compiles assets and then deploys it
Current deployment flow
This command deploys current folder to Heroku.
Current deployment flow
What is Gitlab Runner?
Gitlab Runner is just an app running on a simple Digital Ocean droplet. You can have several runners on a single Droplet. I have installed Docker, NPM and Heroku CLI on a droplet (which Puru created for me).
Something is pushed to alpha/staging/master
Gitlab Runner gets new changes
Gitlab Runner creates a Docker Image with all the dependencies and compiled assets
Gitlab Runner pushes the container to Heroku and deploys it there
Docker deployment flow
Docker deployment flow
At this point we have all new files in current folder
this script checks if JS wasn't changed and copies old assets to public/assets/packs
this is needed to deploy images to heroku
I need to know the DATABASE_URL to run PgBouncer after container is built
this saves the compiled assets in order to use it in step 1 of the next deployments
this command releases the container
this command restarts the app