Creating Kubernetes Cluster with kubeadm¶

For this activity, deploy minimum 2 AWS instances with the Security groups

All traffic is enabled between the instances

Node Name	Instance Details	Resources
Master Node	-t2.medium	4GB Ram , 2 CPU
Worker Node	-t2.micro	1GB Ram , 1 CPU

Preparing the Master and Worker nodes for kubeadm¶

Execute the below Commands on both Master & Worker Nodes

Change the hostname for nodes as master & worker

Installing Docker:¶

Add the Docker repository key and Docker repository.

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add -
add-apt-repository \
"deb https://download.docker.com/linux/$(. /etc/os-release; echo "$ID") \
$(lsb_release -cs) \
stable"

Update the list of packages and install the docker

apt-get update

apt-get install -y docker-ce

echo '{"exec-opts": ["native.cgroupdriver=systemd"]}' | sudo tee /etc/docker/daemon.json

systemctl daemon-reload

systemctl restart docker

systemctl enable docker

Installing kubeadm, kublet, and kubectl:¶

Add the Google repository key and Google repository

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

vim /etc/apt/sources.list.d/kubernetes.list

deb http://apt.kubernetes.io kubernetes-xenial main

Update the list of packages. And install kubelet, kubeadm, and kubectl.

apt-get update

apt-get install kubelet kubeadm kubectl -y

Disable the swap.

swapoff -a

Setup Master Node to Connect with Worker Nodes

sed -i '/ swap / s/^/#/' /etc/fstab

 echo NODENAME=$(hostname -s)

kubeadm init --apiserver-advertise-address=172.31.85.246  --apiserver-cert-extra-sans=172.31.85.246  --pod-network-cidr=10.0.0.0/16

Now Create a Directory Name .kube in the master node home directory

mkdir .kube

Copy the Default conf file to the .kube directory

cp /etc/kubernetes/admin.conf .kube/config

Replace the Ip address with your Instance Private Ip Address and set pod Network

After Executing kubeadm init command you will get one command as output that need to execute on worker nodes

kubeadm join 172.31.85.246:6443 --token n6v08z.53b057pfwnj8mq10         --discovery-token-ca-cert-hash sha256:9e8a38ddfc46c41ecb3317db9fc2145f70bddbdd2c6b8091fbdbab18e1dbcb19

Configuring the Calico in Master Node

kubectl apply -f https://docs.projectcalico.org/manifests/calico.yaml

Now check Kubectl commands

kubectl get node

Now test the cluster

kubectl run pod --image=nginx

kubectl get pod

kubectl get pod -o wide