Tags: #workflow #process #deployment #ci #cd
Make the changes
Create a new branch in git
Make the changes behind a feature flag
Run unit tests to validate your changes with the feature flag both on and off
Pull request
Commit the changes
Push the changes to a remote on github
Make a pull request
CI build runs automatically in the background
Code review
Repeat this step a few times perhaps
Merge the changes into git master
CI runs on master
Install frontend dependencies via npm
Build/optimize HTML+CSS+JS assets
Run frontend unit/functional tests
Install Python dependencies from PyPI
Run backend unit/functional tests
Run integration tests against both assets
Push frontend assets to a CDN
Build a container for the Python program
Push container to registry
Update kubernetes manifest
Replace old code with new code
Kubernetes spins up some instances of the new container
Kubernetes waits for those instances to become healthy
Kubernetes add those instances to the HTTP load balancer
Kubernetes waits for old instances to become unused
Kubernetes spins down old instances
Kubernetes repeats until all old instances have been replaced with new ones
Enable new feature flag
Enable the new code for just yourself, gain confidence
Enable the new code for 10% of your users, watch operational and business metrics
Enable the new code for 50% of your users, watch operational and business metrics
Enable the new code for 100% of your users, watch operational and business metrics
Finally, go through the entire process again to remove the old code and the feature flag