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Kubernetes.md

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Kubernetes

Here's a summary of the transcript as a set of instructions for working with Kubernetes using Minikube and testing Kubernetes YAML files:

Enable systemd on wsl 1st https://gist.github.com/djfdyuruiry/6720faa3f9fc59bfdf6284ee1f41f950 Download microk8s sudo snap install microk8s --classic --channel=1.31

How to Work with Kubernetes Using Minikube and Test Kubernetes YAML

  1. Set up Minikube:

How to fix the apt-key deprecated warning in Ubuntu

Open a terminal window. Change into the apt directory with cd /etc/apt. Copy the trusted.gpg file into the trusted.gpg.d with sudo cp trusted.gpg trusted.gpg.d.

  • Start Minikube with multiple nodes: minikube start --nodes 3 Although we only need 2, you will have to specify 3 as 2 nodes and 1 control plane may also need to use minikube add 2 + 3

  1. Configure kubectl:

    • Set an alias for kubectl: alias kubectl="minikube kubectl --"

  2. Verify cluster setup:

    • Check nodes: kubectl get nodes
  • Verify Minikube status: minikube status

  1. Deploy Nginx: This requires a little bit of tinkering if you use WSL ubuntu Enter "\wsl$" in the File Explorer address bar to view all of your Linux distributions. Select ubuntu pwd in teminal Navigate to home directory Drag and drop files from windows into home directory

    • Create a deployment YAML file (e.g., nginx-deployment.yaml)

    • Apply the deployment: kubectl apply -f nginx-deployment.yaml

    • Check deployment status: kubectl rollout status deployment nginx-deployment

  2. Verify deployment:

    • List pods: kubectl get pods -o wide

    • List deployments: kubectl get deployments

    • List replica sets: kubectl get replicasets

  3. Check Nginx version:

    • Execute into a pod: kubectl exec -it nginx-deployment-77d8468669-jl8rc -- /bin/bash
    • Run nginx -v inside the pod

  4. Upgrade Nginx version:

    • Update the image version in the deployment YAML
    • Apply the changes: kubectl apply -f nginx-deployment.yaml
    • Monitor rollout: kubectl rollout status deployment nginx-deployment

  5. Scale the deployment:

    • Use kubectl scale: kubectl scale deployment nginx-deployment --replicas=3
    • Or update replicas in YAML and apply changes

  6. Verify scaling:

    • Check replica sets: kubectl get replicasets
    • List pods: kubectl get pods

  7. Test Kubernetes YAML:

    • Use kube-score: 
      docker run --rm -v $(pwd):/project zegl/kube-score:latest score nginx-deployment.yaml
    • Review and address security issues (e.g., setting resource limits)

  8. Fix security issues:

    • Add resource limits to your deployment YAML: 
      resources:
  limits:
    cpu: "1"
    memory: "512Mi"
    • Re-run kube-score to verify fixes