How can I hot reload my UWSGI server across all pods in a Kubernetes cluster?

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Asked By BubblyPenguin42 On

I'm trying to set up hot reloading for my UWSGI server in a Kubernetes cluster. Currently, I use uWSGI's touch-reload feature, where I can touch a file outside the container that triggers a reload. This works well with multiple containers because that file is in a shared mounted volume. My goal is to apply this setup in Kubernetes, allowing all my pods to reload simultaneously. I'm also considering if it might just be simpler to restart the entire deployment instead. Any insights on the best approach?

3 Answers

Answered By TechyTurtle9 On

One option is to create a cronjob that periodically checks an external key in Redis and then touches the file. You could integrate this into your Helm chart for deployment, making it easy to manage. Just make sure you test it out to see if it meets your needs.

Answered By CodeWizard21 On

It really depends on your end goal. The hot reload typically happens when there's a file change to update code on-the-fly, but using a shared filesystem for this can be tricky. If you have a read-only mount that DevOps updates periodically, it might be better to consider a rolling restart instead of relying on hot reload.

SkepticalSquirrel11 -

Yeah, a rolling restart might be more stable. It ensures only a few pods are restarted at a time, preventing potential downtime if you run into issues with the new code.

Answered By CuriousCat77 On

Why not just rollout the pods? You could use the touch method or SIGHUP using something like the config reloader sidecar available on GitHub. Alternatively, if you modify a ConfigMap, you could configure uwsgi to listen for changes and reload based on that.

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