# **Install Kubernetes Cluster**

## Login to Master Node and perform the following steps

1. Set the hostname

sudo hostnamectl set-hostname master


2. Letting iptables see bridged traffic

sudo modprobe br_netfilter

cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF

sudo sysctl --system


3. Instaling Docker

sudo apt-get update


sudo apt-get install docker.io -y


sudo systemctl enable docker


sudo systemctl start docker


sudo usermod -aG docker <user_name_of_master>


4. Add the Kubernetes Repository

sudo apt-get update && sudo apt-get install -y apt-transport-https curl


curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -


cat <<EOF | sudo tee /etc/apt/sources.list.d/kubernetes.list
deb https://apt.kubernetes.io/ kubernetes-xenial main
EOF


sudo apt-get update
sudo apt-get install -y kubelet=1.21.0-00 kubeadm=1.21.0-00 kubectl=1.21.0-00


## Login to Worker Nodes and run following Commands

1. Setup the hostname in the second node

sudo hostnamectl set-hostname Worker-1
   

2. Letting iptables see bridged traffic

sudo modprobe br_netfilter
   
cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF

sudo sysctl --system

3. Instaling Docker on Worker

sudo apt-get update
sudo apt-get install docker.io -y
sudo systemctl enable docker
sudo systemctl start docker

4. Add the Kubernetes Repository

sudo apt-get update && sudo apt-get install -y apt-transport-https curl


curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -

cat <<EOF | sudo tee /etc/apt/sources.list.d/kubernetes.list
deb https://apt.kubernetes.io/ kubernetes-xenial main
EOF


sudo apt-get update

sudo apt-get install -y kubelet=1.21.0-00 kubeadm=1.21.0-00 kubectl=1.21.0-00


## Log back to Master Node and perform following steps:

1. Setup kubernetes master using kubeadm init

sudo kubeadm init


*Note: If you get swap error like following disable swap*

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


2. Setup the kubectl config file

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

3. Check the node status

kubectl get node 

*Note: The node will be shown as not ready*

4. Check the pod status using

kubectl get pod -n kube-system 


5. Apply the CNI plugin

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


6. Check the node status

kubectl get node

7. Create Join Command on Master

sudo kubeadm token create --print-join-command

*Note: copy the kubeadm join command display as the output of the command and login to Worker Nodes and execute using sudo*


## Login to Worker Nodes to add it to Master

sudo *kubeadm join <paste the full command which you have copied from the master node*>


>
> *Congratulations!!! Your Kubernetes Cluster is set up Perfectly*
>