Agenda: Kubernetes Setup Using Kubeadm In AWS EC2 Ubuntu Servers
=======================================================
Prerequisite:
==========
3 - Ubuntu Serves
1 - Manager (4GB RAM , 2 Core) t2.medium
AMI : EC2 Ubuntu t2.medium (Name:Kubernetes_master_node)
Security Group:
2 - Workers (1 GB, 1 Core) t2.micro
AMI : EC2 Ubuntu t2.micro (Name:Kubernetes_worker_One and Kubernetes_worker_Two)
Security Group:
Note: Open Required Ports In AWS Security Groups. For now we will open All trafic.
==========COMMON FOR MASTER & SLAVES START ====
# First, login as ‘root’ user because the following set of commands need to be executed with ‘sudo’ permissions.
sudo su -
# Install Required packages and apt keys.
apt-get update -y
apt-get install -y apt-transport-https
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-get update -y
#Turn Off Swap Space
swapoff -a
sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab
# Install And Enable Docker
apt install docker.io -y
usermod -aG docker ubuntu
systemctl restart docker
systemctl enable docker.service
#Install kubeadm, Kubelet And Kubectl
apt-get install -y kubelet kubeadm kubectl kubernetes-cni
# Enable and start kubelet service
systemctl daemon-reload
systemctl start kubelet
systemctl enable kubelet.service
==========COMMON FOR MASTER & SLAVES END=====
===========In Master Node Start====================
# Steps Only For Kubernetes Master
# Switch to the root user.
sudo su -
Configuring the kubelet cgroup driver.
kubeadm allows you to pass a KubeletConfiguration structure during kubeadm init. This KubeletConfiguration can include the cgroupDriver field which controls the cgroup driver of the kubelet.
cat << EOF >> /etc/docker/daemon.json
{
"exec-opts": ["native.cgroupdriver=systemd"]
}
EOF
Restart your docker service:
# systemctl restart docker
Reset kubeadm initializations:
# kubeadm reset
# Initialize Kubernates master by executing below commond.
kubeadm init
#exit root user & exeucte as normal user
exit
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
# To verify, if kubectl is working or not, run the following command.
kubectl get pods -o wide --all-namespaces
#You will notice from the previous command, that all the pods are
running except one: ‘kube-dns’. For resolving this we will install a #
pod network. To install the weave pod network, run the following
command:
kubectl apply -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')"
kubectl get nodes
kubectl get pods --all-namespaces
# Get token
kubeadm token create --print-join-command
=========In Master Node End====================
Add Worker Machines to Kubernates Master
=========================================
Copy kubeadm join token from and execute in Worker Nodes to join to cluster
kubectl commonds has to be executed in master machine.
Check Nodes
=============
kubectl get nodes
Deploy Sample Application
==========================
kubectl run nginx-demo --image=nginx --port=80
kubectl expose deployment nginx-demo --port=80 --type=NodePort
Get Node Port details
=====================
kubectl get services
