In the Previous Blog Post, I have given a brief of What is Kubernetes and the Architecture of Kubernets. If you have not seen then visit Kubernetes Basic . In this blog, I will show you how you can setup Kubernetes Cluster in 15 minutes. we are going to set up master and worker nodes. You can use AWS t2-medium instance for the Master node since the minimum requirement to create a Master Node is 2 CPU & 4 GB RAM. For Worker Node you can go with t2-micro. But in this Blog, I have chosen all the nodes as t2-micro.
Objectives
- Setup a Master Node and Worker Node. You can view all the node in master node.
Before you begin Setup Instance in AWS
- Login to AWS Account
- Launch 3 Instance(Ubuntu – 16.04 ,t2 Medium) : 1-Master , 2-Worker Node
Setup Kubernetes Cluster
Configure in Both Master and Worker Node
sudo su
apt-get update
apt-get install apt-transport-https
This HTTP is needed for intracluster communication(Particularly from Master to Worker Node)
In Ubuntu 16.04 Docker is already available. You just need to install using the below command
apt install docker.io -y
To check if docker is installed or not run ‘docker –version’
systemctl start docker systemctl enable docker
Setup Open GPG Key. This is required for intracluster communication. It will be added to the source key on this node i.e. when K8S send signed info to our host, it is going to accept that information because this open GPG key is present in the source key.
Install GPG key
curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key --keyring /usr/share/keyrings/cloud.google.gpg add -
Open Kubernetes list and past deb command
vi /etc/apt/sources.list.d/kubernetes.list
deb http://apt.kubernetes.io/ kubernetes-xenial main
After inserting kubernetes-xenial in kubernetes.list update the repository again.
apt-get update
If on apt-get update you get ERROR ( NO_PUBKEY FEEAA12694307EA071 NO_PUBKEY 8B574C5C2D2836F4BE) then import using
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys <KEY>
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys FEEAA12694307EA071 sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 8B574C5C2D2836F4BE
and then run apt-get update
apt-get install -y kubelet kubeadm kubectl kubernetes-cni
Configure Master Node
kubeadm init
If you get an error then check kubelet status is running or not. If not then
Make sure you are logged in as root and execute the below two commands :
echo '{"exec-opts": ["native.cgroupdriver=systemd"]}' >> /etc/docker/daemon.json
systemctl restart docker
kubeadm reset
When you run kubeadm init then you will given set of command to run for example
mkdir -p $HOME/.kube cp -i /etc/kubernetes/admin.conf $HOME/.kube/config chown $(id -u):$(id -g) $HOME/.kube/config
You will be even given the join command that you need to run on the worker node to join the master node. Please run the join command when you have configured the flannel.
Configure Flannel
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
CONFIGURE WORKER NODES
COPY LONG CODE PROVIDED MY MASTER IN NODE NOW LIKE CODE GIVEN BELOW
e.g- kubeadm join 172.31.6.165:6443 –token kl9fhu.co2n90v3rxtqllrs –discovery-token-ca-cert-hash sha256:b0f8003d23dbf445e0132a53d7aa1922bdef8d553d9eca06e65c928322b3e7c0
Open 6443 Port so that master node can connect
If you are getting error failed with error: Get “http://localhost:10248/healthz” then run:
echo '{"exec-opts": ["native.cgroupdriver=systemd"]}' >> /etc/docker/daemon.json
systemctl restart docker
GO TO MASTER AND RUN THIS COMMAND
kubectl get nodes
That’s all in the Blog. Hope you like it. Don’t forget to subscribe to the latest blog.
Install Kubectl: https://docs.aws.amazon.com/eks/latest/userguide/install-kubectl.html
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