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How to Upgrade Istio the Git-Ops Way
Istio 1.17 has been running really well in my Garage Kubernetes lab, but I thought it’s time to give it an upgrade. It was installed and configured using istioctl utility last time when I bootstrapped the cluster. Since I’ve automated a lot of Kubernetes resources using ArgoCD I would like to upgrade Istio the git-ops…
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A Simple and Interactive Decoder for Kubernetes Secrets
TL; DR: Here’s a simple shell function which can decode Kubernetes secrets interactively and should work in any Bash and compatible environments. Requirements: Here’s the code. This can be chained together with other commands too, eg. on a Mac, I can do Then the decoded content of selected secret key will be put into clipboard.…
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A GKE Issue: Metadata Service Is Unreachable In Nodes
Recently I encountered some errors in a GKE cluster where a lot of pods were stuck at crash loop backoff state, which means the pods couldn’t recover on their own. When taking a closer look, I saw errors like: It’s a DNS issue then. However when I created a pod and ran some DNS tests…
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How to Enable Compression in Istio Ingress Gateway
TL; DR: here’s a code snippet to turn on gzip compression for Istio’s ingress gateway, using Envoy filter. Tested with Istio 1.16 and Kubernetes 1.26. To test it with curl: 🙂
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How to Mount an Existing Google Persistent Disk to a Pod in GKE
TL; DR: Below are steps to mount an existing Google Persistent Disk to a pod in a GKE cluster in the same region. Most of the time I’d prefer to run stateless pods in Kubernetes clusters – they come, they go, as if nothing happened. When there are things to be persisted, a Persistent Volume…
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Solved: Uninstallation of config-connector Got Stuck in ArgoCD
The Kubernetes Config Connector is another level of IaC(Infrastructure as Code): It wraps Google Cloud resources like a Cloud Load Balancer with Kubernetes CRDs(Custom Resource Definition) so instead of writing Terraform HCL I can write YAML to manage GCP infrastructure. However when there’s a need to uninstall a config-connector, it got stuck in ArgoCD As…
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Django DB Migration Job with ArgoCD
A Job in Kubernetes is a one-off and immutable task to be carried out during deployment. But what if a job needs to run for each deployment? A new job with the same name can’t be deployed on top of the existing one, given it in completed or failed state. Since Kubernetes 1.23, A TTL(Time…
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Cloud SQL MySQL: Best Password is No Password
Security for web applications has come a long way. In the case of database passwords, there is a lot of approaches to keep them safe: But isn’t it the best if there’s no need for a password at all? With IAM authentication for Cloud SQL, the password can be avoided after all. Here’s how to…