Hacker News Reader

Comment by sk0g | Hacker News Reader

Not sure if this is in there, haven't had a chance to take a look yet, but does anyone know a good source (preferably with example) of how to get multiple images to deploy to the same node? From what I can tell I'm after the `nodeAffinity` field, but I found Kubernetes' documentation rather terse.

View on HN

Have you tried just putting the images in the same pod? You might want to search and read about the sidecar pattern.

Do you mean manually? Should clarify, I use Google Kubernetes Engine that manages the deployments for me, and there's also CI/ CD happening in the background that updates the images every so often. Would need to find an automated way of doing this.

You can use affinity to assign pods to nodes. https://kubernetes.io/docs/concepts/configuration/assign-pod...

But if you want several containers to always be deployed together, you want to put them in the same pod. You do this in the deployment yaml.

https://kubernetes.io/docs/concepts/workloads/pods/pod-overv... https://kubernetes.io/docs/tasks/run-application/run-statele...

So there are two types of affinity: Node affinity and Pod affinity. Node affinity would tell the scheduler to prefer a Node. Pod Affinity would tell the scheduler to prefer other Pods location.

I've learned more from your two lines than I did reading through three different entries in the K8s wiki, all of which are rather long. Or rather, it's only clicked now.

Thanks!

Reply on news.ycombinator.com