The application has been written. The container build is done on each merge. The last thing you want is to mess around with that. But there are things missing. There’s no integration with metrics. There are no readiness checks, so nodes get traffic before they are ready. Luckily, every modern container deployment system allows for “side-cars”: container images that are deployed alongside the main application containers. Writing a quick web application in Python to serve these missing bits, to be deployed as a side-car, is a popular solution.
How do you do this? How do you integrate into your container management system? And when is it better to modify the original application?
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