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Kubernetes Setup Using Kubeadm In AWS EC2 Ubuntu Serverse.

Prerequisite

• AWS Acccount.
• Create 3 - Ubuntu Servers -- 18.04.
• 1 Master (4GB RAM , 2 Core) t2.medium
• 2 Workers (1 GB, 1 Core) t2.micro
• Create Security Group and open required ports for kubernetes.
  • Open all port for this illustration
• Attach Security Group to EC2 Instance/nodes.

Assign hostname & login as ‘root’ user because the following set of commands need to be executed with ‘sudo’ permissions.

sudo hostnamectl set-hostname master sudo -i

# run the following below as a script
# This will Install Required packages and apt keys.
#!/bin/bash
sudo apt update -y
sudo apt install -y apt-transport-https
sudo curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
cat <<EOF >/etc/apt/sources.list.d/kubernetes.list
deb https://apt.kubernetes.io/ kubernetes-xenial main
EOF
apt update -y
#Turn Off Swap Space
swapoff -a
sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab
#Install kubeadm, Kubelet And Kubectl containerd
sudo apt-get install -y kubelet containerd kubeadm kubectl kubernetes-cni 
# apt-mark hold will prvent the package from being authomatically upgraded or removed
sudo apt-mark hold kubelet containerd kubeadm kubectl kubernetes-cni 
# 
cat <<EOF | sudo tee /etc/modules-load.d/containerd.conf
overlay
br_netfilter
EOF

# Setup required sysctl params, these persist across reboots.
cat <<EOF | sudo tee /etc/sysctl.d/99-kubernetes-cri.conf
net.bridge.bridge-nf-call-iptables  = 1
net.ipv4.ip_forward                 = 1
net.bridge.bridge-nf-call-ip6tables = 1
EOF

# Apply sysctl params without reboot
sudo sysctl --system
# Configure containerd:
sudo mkdir -p /etc/containerd
containerd config default | sudo tee /etc/containerd/config.toml
# Restart containerd:
sudo systemctl restart containerd
# If you get error releated to kubernetes-cni if alreay exists install with out kubernetes-cni
apt-get install -y kubelet kubeadm kubectl 
# Enable and start kubelet service
sudo systemctl daemon-reload 
sudo systemctl start kubelet 
sudo systemctl enable kubelet.service

exit as root user & execute the below commands as normal ubuntu user

sudo su - ubuntu

Initialised the control plane.

# Initialize Kubernates master by executing below commond.
sudo kubeadm init

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

To verify, if kubectl is working or not, run the following command.

kubectl get pods -A

#deploy the network plugin - weave network
kubectl apply -f https://github.com/weaveworks/weave/releases/download/v2.8.1/weave-daemonset-k8s.yaml
kubectl get pods -A
kubectl get node

#deploy the network plugin - weave network
kubectl apply -f https://github.com/weaveworks/weave/releases/download/v2.8.1/weave-daemonset-k8s.yaml
kubectl get pods -A
kubectl get node

Copy kubeadm join token from the master and execute in Worker Nodes to join to cluster

kubeadm join 172.31.10.12:6443 --token cdm6fo.dhbrxyleqe5suy6e \
        --discovery-token-ca-cert-hash sha256:1fc51686afd16c46102c018acb71ef9537c1226e331840e7d401630b96298e7d