Kubernetes :2

DevOps Classroom Series – 06/Apr/2021

Installing Kubernetes

• K8s can be installed on a single node to set up the developer environments.
  • minikube
• On production environments we would be using a multi node setup
  • For IOT / ARM processers => K3s (Lightweight kuberenetes)
  • Kubeadmin (multi node setup on linux workloads)
  • Kops Refer Here for installing k8s on AWS
  • kubespray Refer Here
  • Native Kubernetes on Cloud
    • AKS (Azure Kubernetes Services)
    • GKE (Google Kubernetes Engine)
    • EKS (Elastic Kubernetes Services on AWS)
• Lets try to setup
  • minikube
  • kubeadm

Minikube

• This is a tool to set up a single node cluster and suitable for local environments.
• To setup minikube Refer Here
• Commands

choco install minikube -y
minikube start

• Check the nodes 
• Check all the pods 

Kubeadm

• In this article we will be creating a kubernetes cluster on multiple linux nodes using kubeadm Refer Here
• We would be creating a 3 node kubernetes cluster 
• Lets follow the installation guide Refer Here
• Install container runtime on the nodes. Lets use docker container Refer Here
• Now install kubeadm, kubectl and kubelet by following instructions Refer Here 
• Now lets install pod network

kubectl apply -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')"

• Now lets login into the node become a root user and execute the kubeadm join command

kubeadm join 10.128.0.49:6443 --token <somtoken>

• Now login into k8s master and execute kubectl get nodes  
• Summary of installation
  • Install docker on the nodes (both) and execute the steps mentioned in Refer Here 
  • Install the kubeadm, kubelet and kubectl on both nodes Refer Here 
  • Now initialize the kubeadm by loggin in as root user on master node
  kubeadm init
  • Copy the commands to configure the kubectl and join command 
  • Now become the non root user and execute the following 
  • Now install a pod network on master node and verify if the node is in ready state by executing kubectl get nodes
  kubectl apply -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')"
  • Now login into node and become root user (sudo -i) and execute the join command 
  • Now login into master node and execute kubectl get nodes to see the status of both nodes