/Kubeadm-master-install

Kubeadm-master-install

Login as root user

sudo su -

Disable Firewall

ufw disable

Disable swap

swapoff -a; sed -i '/swap/d' /etc/fstab

Update sysctl settings for Kubernetes networking

cat >>/etc/sysctl.d/kubernetes.conf<<EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system

Install docker engine

apt install -y apt-transport-https ca-certificates curl gnupg-agent software-properties-common
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add -
add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
apt update
apt install -y docker-ce=5:19.03.10~3-0~ubuntu-focal containerd.io

Kubernetes Setup

Add Apt repository

curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
echo "deb https://apt.kubernetes.io/ kubernetes-xenial main" > /etc/apt/sources.list.d/kubernetes.list

Install Kubernetes components

apt update && apt install -y kubeadm=1.18.5-00 kubelet=1.18.5-00 kubectl=1.18.5-00

Initialize Kubernetes Cluster

Update the below command with the ip address of kmaster

kubeadm init --apiserver-advertise-address=192.168.5.92 --pod-network-cidr=192.168.0.0/16  --ignore-preflight-errors=all
Deploy Calico network
kubectl --kubeconfig=/etc/kubernetes/admin.conf create -f https://docs.projectcalico.org/v3.14/manifests/calico.yaml

Create Kubeconfig

Note: Exexcute these command as non-root user

mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

Verify Installation

kubectl get po -A

Uninstall Kubeadm

kubeadm reset --ignore-preflight-errors=all
sudo apt-get purge kubeadm kubectl kubelet kubernetes-cni kube*   
sudo apt-get autoremove  
sudo rm -rf ~/.kube