Multi Node Kubernetes Cluster Using Ansible..

What is a Kubernetes Cluster?

A Kubernetes Cluster is a set of nodes that run containerized applications. Kubernetes clusters are comprised of one Master Node and a number of Worker Nodes. These nodes can either be physical computers or virtual machines, depending on the cluster.

Kubernetes Components:-

Control Plane Components:-

• kube-apiserver - The API server is a component of the Kubernetes control plane that exposes the Kubernetes API.
• etcd - Consistent and highly-available key value store used as Kubernetes' backing store for all cluster data.
• kube-scheduler - Control plane component that watches for newly created Pods with no assigned node, and selects a node for them to run on.
• kube-controller-manager - Control Plane component that runs controller processes.

Node Components:-

• kubelet - An agent that runs on each node in the cluster. It makes sure that containers are running in a Pod.
• kube-proxy - kube-proxy maintains network rules on nodes.
• Container runtime - The container runtime is the software that is responsible for running containers. Ex - docker, CRI-O.

Let's Start the Practical Part:-

• First of all, create a Seperate Workspace for writing the code.

mkdir /aws

cd /aws

• Use cat command to read the Ansible Inventory and Ansible Configuration File.

• Create a Key-Pair on AWS Cloud and then download it. Then transfer that key using WinSCP from Windows to the Virtual Machine where Ansible is configured. to the /aws folder. Then copy this key from /aws to /etc/ansible folder.

• Provide the Permission to the Key-Pair for using it.

• Then create a Ansible Playbook for launching two Instances on the top of AWS Cloud for configuring the Kubernetes Cluster.

vim ec2.yml

• Create an Ansible Vault for keeping the AWS Access Key and Secret Key.

• Now, if we will try to read the vault file using cat command, then we cannot read.

• Use the command given below for reading the Ansible Vault. But, when we use this command, then it will first ask for Vault Password.

• Now, before Running the Ansible Playbook, we have to check the syntax of the Playbook whether it is right or wrong.

Output:-

• Check whether the Ansible Inventory is successfully updated or not.

• Create an Ansible Role named as "Master" for Configuring Master Node.

• Follow the steps to create an Ansible Playbook inside Master Role for configuring Master Node of Kubernetes Cluster.

• Create a file i.e. daemon.json inside the files folder of Master Role.

• Create an Ansible Role named as "Slave" for Configuring Slave Node.

• Follow the steps to create an Ansible Playbook inside Slave Role for configuring Slave Node of Kubernetes Cluster.

• Create a file i.e. daemon.json inside the files folder of Slave Role.

• Create a file i.e. Cluster.yml for running both Master and Slave Roles for configuring Kubernetes Cluster.

• Now, run the Ansible Playbook i.e. Cluster.yml by using the command given below.

Successfully Done!! 😌😌

Now, to Verify that the Kubernetes Cluster is configured successfully -

• Go to AWS, then select Master (EC2 Instance) and then click on Connect.

• Change the power from ec2-user to root user and then use the command i.e. "kubectl get nodes" which shows that Master and Slave Node is in Ready State.

Hence, Kubernetes Cluster is Configured Successfully.😊😊

THANKS FOR GIVING YOUR VALUABLE TIME !!

😁😁

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