Creating Instances:
To kick things off, let's create two instances – one for the master and one for the node. Use the t2.medium instance type and Ubuntu as the base image.
SSH Connection:
Now, let's establish an SSH connection. Whether you prefer using Putty or launching the instance directly, connect to both the master and node using your terminal.
Kubernetes Setup:
Moving on to the Kubernetes setup, execute the following commands on both the master and node, one after the other:
#Here we are installing the docker engine
sudo apt update
sudo apt-get install -y apt-transport-https ca-certificates curl
sudo apt install docker.io -y
Adding the GPG keys and enabling Docker
sudo systemctl enable --now docker # enable and start in single command.
# Adding GPG keys.
curl -fsSL "https://packages.cloud.google.com/apt/doc/apt-key.gpg" | sudo gpg --dearmor -o /etc/apt/trusted.gpg.d/kubernetes-archive-keyring.gpg
Just to check whether the command ran properly execute the below
sudo service docker status
Now adding and source list and installing kubeadm
# Add the repository to the sourcelist.
echo 'deb https://packages.cloud.google.com/apt kubernetes-xenial main' | sudo tee /etc/apt/sources.list.d/kubernetes.list
sudo apt update
sudo apt install kubeadm=1.20.0-00 kubectl=1.20.0-00 kubelet=1.20.0-00 -y
Master Node Initialization:
Initialize the Kubernetes master node:
sudo kubeadm init
After successful execution, your Kubernetes control plane will be initialized. Set up local kubeconfig for both the root user and a normal user:
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
Apply Weave network for master to communicate with nodes:
kubectl apply -f https://github.com/weaveworks/weave/releases/download/v2.8.1/weave-daemonset-k8s.yaml
Worker Node Configuration:
Run the following commands on the worker node.
Run the following command on node to perform pre-flight checks and reset Kubernetes configurations
sudo kubeadm reset pre-flight checks
To generate the join command token, execute the following on your Kubernetes master node, This will provide you with the command needed for joining other nodes to the cluster. Ensure to run this on the master node and follow the displayed instructions on your worker nodes.
sudo kubeadm token create --print-join-command
Paste the join command you got from the master node and append --v=5 at the end. Make sure either you are working as sudo user or use sudo before the command
sudo kubeadm join 172.31.12.239:6443 --token iwuxnk.wbhzjrhqd226a2l4 --discovery-token-ca-cert-hash sha256:16b427ac6a78c173405351e5f7a25e91735265eabb386a7c7e1bdc0f44bef7ad --v=5
As you may see it is trying to connect but since the port 6443 is not exposed we need to expose the port
Expose Port on AWS:
Now the below operation we are going to perform on AWS on the Master instance
Now execute the below on the Master
kubectl get nodes
Test a demo Pod
If you want to test a demo pod, you can use the following command: Execute on Master
kubectl run hello-world-pod --image=busybox --restart=Never --command -- sh -c "echo 'Hello, World' && sleep 3600"
Now goto Node and excute docker ps it should resemble the below
This should provide you with the expected results.
Conclusion:
You've successfully completed the Kubernetes setup journey! With instances for the master and node configured using t2.medium and Ubuntu, and SSH connections established, you've set the stage for a powerful Kubernetes cluster.
Consider this just the start of your Kubernetes adventure—may your orchestrations be smooth, your containers happy, and your tech endeavors full of joy!