kubernetes

Kubernetes

There are several ways to test kubernetes in local machine.

Minikube

Minikube creates a virtual machine, it kinda slow to provision. But it will get you started on using kubernetes.

1. Get kubctl (https://kubernetes.io/docs/tasks/tools/install-kubectl/)

curl -LO https://storage.googleapis.com/kubernetes-release/release/`curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt`/bin/linux/amd64/kubectl
chmod +x kubectl
mv kubectl /usr/local/bin/

2. Get minikube (https://kubernetes.io/docs/tasks/tools/install-minikube/)

curl -Lo minikube https://storage.googleapis.com/minikube/releases/latest/minikube-darwin-amd64
chmod +x minikube
mv minikube /usr/local/bin/

3. Start minikube by calling minikube start. If it fails, you might need to install VirtualBox.
4. Run kubectl create deployment webserver --image=nginx:alpine
5. Use kubectl get deployment to see if it's deployed.
6. Use kubectl get pods to see the pods under deployment.
7. Try deleting the pod kubectl delete pods [pod_name], new pod will be created.
8. Exposing the nginx kubectl expose deployment webserver --type=LoadBalancer --port=80
9. Check available service using kubectl get services
10. Get the url using minikube service webserver --url. Try openning the url in a browser.
11. Minikube has dashboard, run minikube dashboard
12. If you done playing, you can clean it up by removing the VM using minikube delete

Reference: https://www.youtube.com/watch?v=BDrcUjOczsE

KinD

KinD is a short for Kubernetes in Docker. With this, you don't need VM. Docker is all you need.

1. Download kind from https://github.com/kubernetes-sigs/kind/releases. Chose the binary that suits your operating system.

curl -Lo ./kind https://github.com/kubernetes-sigs/kind/releases/download/v0.5.1/kind-$(uname)-amd64
chmod +x ./kind
mv kind /usr/local/bin/kind

2. Run kind create cluster. It will download docker image kindest/node, which is about 500MB. So depend on the speed of your internet connection, it might take a while. Once it done, it will tell you to run these:

export KUBECONFIG="$(kind get kubeconfig-path --name="kind")"
kubectl cluster-info

3. You can try to run kubectl port-forward svc/webserver 8080:80 and access 127.0.0.1:8080 to get to nginx. But when the pods get deleted, you'll lost access to it, even if the pods get replaced kubernetes.
4. Clean up:

unset KUBECONFIG
kind delete cluster

Well, that's how far I could go with KinD for the day.

References:

• https://www.bogotobogo.com/DevOps/Docker/Docker-Kubernetes-Multi-Node-Local-Clusters-kind.php
• https://banzaicloud.com/blog/kind-ingress/