Kubernetes Debugging and Clean Installation Guide for Experienced DevOps Engineers

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Kubernetes (K8s) is a powerful and complex tool, and even for experienced DevOps engineers, troubleshooting and maintaining a clean environment can sometimes get tricky. This guide covers essential commands and best practices for debugging your Kubernetes setup, checking installed versions, and completely removing and reinstalling Kubernetes on an Ubuntu machine.

Debugging Kubernetes Like a Pro

1. Checking Cluster Status

kubectl cluster-info
kubectl get nodes
kubectl get pods --all-namespaces

2. Diagnosing Issues

kubectl describe pod <pod-name>
kubectl logs <pod-name>
kubectl get events --sort-by=.metadata.creationTimestamp

3. Checking Resource Usage

kubectl top nodes
kubectl top pods

4. Debugging Networking

kubectl get svc
kubectl get endpoints
kubectl describe svc <service-name>

Identifying Installed Kubernetes Distribution

If you’re not sure which lightweight Kubernetes distribution you have installed (Minikube, K3s, MicroK8s, Kind), use the following commands:

1. Checking Minikube

minikube status

2. Checking K3s

k3s --version
sudo k3s kubectl get nodes

3. Checking MicroK8s

microk8s status

4. Checking Kind

kind get clusters

Completely Removing Kubernetes

Sometimes you need a fresh start. Here’s how to remove different Kubernetes distributions:

1. Removing Minikube

minikube stop
minikube delete
sudo rm -rf ~/.minikube ~/.kube

2. Removing K3s

sudo /usr/local/bin/k3s-uninstall.sh

3. Removing MicroK8s

sudo snap remove microk8s
sudo rm -rf ~/.kube

4. Removing Kind

kind delete cluster
sudo rm -rf ~/.kube

Reinstalling Kubernetes

1. Reinstalling Minikube

curl -LO https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64
sudo install minikube-linux-amd64 /usr/local/bin/minikube
minikube start --driver=docker

2. Reinstalling K3s

curl -sfL https://get.k3s.io | sh -

3. Reinstalling MicroK8s

sudo snap install microk8s --classic
microk8s status --wait-ready

4. Reinstalling Kind

curl -Lo ./kind https://kind.sigs.k8s.io/dl/latest/kind-linux-amd64
chmod +x ./kind
sudo mv ./kind /usr/local/bin/kind
kind create cluster

Final Thoughts

For an experienced DevOps engineer, knowing how to efficiently debug, remove, and reinstall Kubernetes distributions is crucial for maintaining clean and efficient environments. By using the commands and practices above, you’ll keep your local Kubernetes development environment running smoothly and avoid common issues.

Have more advanced debugging techniques or tools you swear by?  Share them in the comments below!





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