kubetrim

Tidy up old Kubernetes clusters from kubeconfig.

kubetrim tries to connect to each cluster in the current kubeconfig file, and removes any that are unreachable, or which error.

Q&A:

• What if I like doing things the long way?

  You can combine kubectl config get-clusters with kubectl config use-context and kubectl get nodes, followed by kubectl config delete-cluster and kubectl config delete-context for each. kubectx -d will remove a context, but leaves the cluster in your kubeconfig file, so requires additional steps.

• Doesn't [my favourite tool] have an option to do this?

  Feel free to use your favourite tool instead. kubetrim is a memorable name, and a simple tool that just does one job, similar to kubectx

• What if I want to keep a cluster that is unreachable?

  This is not supported at this time, if you need that feature, open an issue.

• What if my cluster is valid, but kubetrim cannot detect it?

  Open an issue, and we can look at adding support for your use-case.

• kubetrim is great, how can I support you?

  Have a look at arkade and k3sup, you may like those too. You can also sponsor me via GitHub.

• How can I run kubetrim daily?

  Create a crontab with the following expression: 0 0 * * * kubetrim

• Can I run kubetrim every time I open a terminal?

  Yes, you can add kubetrim & to your .bashrc, .bash_profile or .zshrc file, which will run in the background, and not slow down your terminal session from starting up.

• What if my WiFi is down and I run this tool?

  If all clusters show as unavailable, kubetrim will not delete any clusters, in this case add --force to the command.

Usage

$ kubectx

default
do-lon1-openfaas-cluster
kind-2
kind-ingress

$ kubetrim

kubetrim (dev) by Alex Ellis 

Loaded: /home/alex/.kube/config. Checking..
  - kind-2: ✅
  - kind-ingress: ❌ - (failed to connect to cluster: Get "https://127.0.0.1:40349/api/v1/nodes": dial tcp 127.0.0.1:40349: connect: connection refused)
  - default: ✅
  - do-lon1-openfaas-cluster: ❌ - (failed to connect to cluster: Get "https://da39a3ee5e6b4b0d3255bfef95601890afd80709.k8s.ondigitalocean.co.uk/api/v1/nodes": dial tcp: lookup da39a3ee5e6b4b0d3255bfef95601890afd80709.k8s.ondigitalocean.co.uk on 127.0.0.53:53: no such host)
Updated: /home/alex/.kube/config (in 364ms).

$ kubectx

default
kind-2

What if the Internet is unavailable, and all clusters report as unavailable?

# Take down WiFi/Ethernet

$ kubetrim

No contexts are working, the Internet may be down, use --force to delete all contexts anyway.

# Force the deletion, even if all clusters are unavailable.

$ kubetrim --force

Try out kubetrim without writing changes to the kubeconfig file:

$ kubetrim --dry-run

Use a different kubeconfig file:

$ KUBECONFIG=$HOME/.kube/config.bak kubetrim

Installation

Getting kubetrim with arkade:

curl -sfLS https://get.arkade.dev | sh

arkade get kubetrim

License

MIT license