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Resource Optimisation Made Simple in Kubernetes Clusters
TL; DR: I made a shell script which prints out the CPU and memory usage vs allocation for each pod in a Kubernetes cluster. Then it’s easy to tell where to optimise. Here it is: Just in case, you need the metrics-server for the kubectl top command to function. 🙂
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Unit Testing in Jsonnet
For the time being(April 2025), there doesn’t seem to be a de facto Jsonnet framework for unit testing. Yet with simple assert statements it’s very helpful to have tests for shared functions, etc. 🙂
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Slow Refresh in ArgoCD? Scale It Up
TL; DR: I merged a few ArgoCD clusters together into a central ArgoCD last week, just to have 1 ArgoCD to manage multiple GKE clusters. Obviously this will cause some performance issue – the more apps I have, the longer it takes to refresh in ArgoCD. Here’s a simple way to scale it up. For…
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A Deep-merge Function for Jsonnet
TL; DR: As of March 2025, there’s no deep merge function in Jsonnet’s standard library yet. So I wrote something myself. Not sure if I should do a PR to contribute but my last attempt was still there hanging 🙂
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An Anatomy of an ArgoCD ApplicationSet
TL; DR: Here’s a working ArgoCD Application Set in YAML with probably all popular features + comments. I wouldn’t expect anyone got theirselves here without knowing what an ArgoCD ApplicationSet is for but just in case. A good reference: https://medium.com/@geoffrey.muselli/argocd-at-scale-with-applicationset-go-template-7f326d8a61f3 🙂
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Solved: Kustomize Unable to Parse SM or JSON Patch
Recently I noticed that my ArgoCD manifests I used to patch using kustomize don’t work with latest version of kustomize anymore. The error I got looks like: My patch.yaml had something like this: There’s no syntax error in my files as this worked before. I tried to remove sections from the patch file and see…
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Solved: Jsonnet Language Server in Zed Failed to Start
Since some update recently my Zed editor on my Macbook had trouble to start the Jsonnet language server, so the syntax validation and auto-complete are gone. I had a look at the error message but it didn’t really hinted anything: At least it told me where the server’s binary is located. So I went to…
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My New Favourite Editor is Neither VS Code Nor Atom
I used to use Atom as my main editor but it somehow lost its popularity and withered sadly. Then I switched to VS Code which is also Electron based and similar to Atom in some ways. VSC was great until recently I heard about Zed, which I immediately felt excited about it, for a few…