Kubernetes – Prevent Empty Replicasets From Deployments
Kubernetes deployments are funny. For every kubectl rollout restart deployment (or it’s API equivalent), there is a new -empty- statefulset… If you want to take a look, run the following: Quite allot huh? Clean them up with: To prevent a new empty replicaset for every new deployment, add: To your deployment, this will prevent each…
Kubernetes – Connect To Private Container Registry
Now that you are hosting your own registry (… are you?). You probably want to deploy Kubernetes pods from that registry. For this you need two things: Docker registry credentials saved in a Secret imagePullSecrets in deployment pointing to said Secret First, Create secret: Second, Use secret in in deployment. Example: And you’re done ð
Kubernetes – Kubectl MySQL Client One-Liner
Some of my applications, if not all of them, use MySQL in some fashion. The database pod is not exposed outside it’s kube-network service and is only reachable from within it’s namespace… Troubleshooting or random database querying can be a hassle. Here’s a one-liner to help you: The container will disappear when you exit the…
Kubernetes – Useful Shorthands for Kubectl
Useful aliases for kubectl that I use Add these to ~/.zshrc (ZShell) or ~/.bashrc (Bash)
Kubernetes – Simple CronJob for MySQL/MariaDB Backup
No Secret, No Configmap, No Fuzz. Just a command and args one-liner that gets the job done, day after day, with an invaluable result on the day that you reaaaally need it. Example Backup Cron: This will create a daily job (00:00, 12AM) that runs container image “mysqldump”, generously authored by docker.io/bigtruedata. It will store…