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Create a single-master Kubernetes cluster with kubeadm

This will set up a new single-master Kubernetes cluster that has

  • 1 master, has 2 CPUs and 2 GBs RAM
  • 3 workers, each worker has 2 CPUs and 2 GBs RAM

setup.png

Prerequisites

Before you want to try this on your local, here are requirements

  • A public key in .ssh/id_rsa.pub in your home directory
  • Directly download Virtualbox and install, or use homebrew 
    brew install --cask virtualbox
  • Vagrant 
    brew install --cask vagrant

Provision VMs

cd create-single-master-cluster
vagrant up

Create Kubernetes cluster

ansible-playbook -i playbook/inventory.yml playbook/playbook.yml

Let's ssh into the master VM, and verify the cluster

ssh [email protected]
kubectl get nodes

Download kubeconfig to your local

mkdir ~/.kube-local
scp [email protected]:/home/ci/.kube/config ~/.kube-local/config
export KUBECONFIG=~/.kube-local/config && kubectl get nodes

Creating and exploring an nginx deployment

Source: https://kubernetes.io/docs/tasks/run-application/run-stateless-application-deployment/

Create a Deployment

kubectl apply -f https://k8s.io/examples/application/deployment.yaml

Display information about the Deployment

kubectl describe deployment nginx-deployment

List the Pods created by the deployment

kubectl get pods -l app=nginx