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_posts/2024-08-20-using-multiple-kubeconfigs.md

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+---
+title: "Using multiple kubeconfig files"
+date: 2024-08-20
+---
+
+On a daily basis I'm working with multiple Kuberetes cluster. I also use [Kubernetes tools VSCode extension](https://marketplace.visualstudio.com/items?itemName=ms-kubernetes-tools.vscode-kubernetes-tools). Extension allows to easily change current context from within VSCode.
+
+## Generating common kubeconfig
+
+In order to switch contexts you need to merge multiple kubeconfig files into single yaml file. To do that I have created a script at `/home/guntis/.kube/merge.sh` that looks something like:
+```sh
+KUBECONFIG=\
+~/.kube/abc-test.yaml:\
+~/.kube/abc-staging.yaml:\
+~/.kube/abc-prod.yaml:\
+ kubectl config view --flatten > ~/.kube/config
+```
+
+When you run this script it will merge all listed files into one.
+
+Important rule is that each kubeconfig must have unique keys. For example `abc-test.yaml` file would look like this:
+```yaml
+apiVersion: v1
+clusters:
+- cluster:
+    certificate-authority-data: LS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0tLS0tCk1JS...ZJQ0FURS0tLS0tCg==
+    server: https://kubernetes.docker.internal:6443
+  name: abc-test
+contexts:
+- context:
+    cluster: abc-test
+    user: abc-test
+  name: abc-test
+current-context: abc-test
+kind: Config
+preferences: {}
+users:
+- name: abc-test
+  user:
+    client-certificate-data: LS0tLS...S0tCg==
+    client-key-data: LS0tL..0tCg==
+```
+
+## Switch contexts using VSCode
+![VScode Kubernetes extension](/assets/k8s-contexts.png)
+
+## Switch contexts using k9s
+
+K9s is super convenvient utility that also allows switching contexts, by typing `:ctx` command.
+![K9s contexts](/assets/k9s-contexts.png)