Kubernetes has become the standard for container orchestration, and it's no surprise that many organizations are turning to it to manage their containerized applications. While Kubernetes can be installed on a cloud platform, it can also be installed on a bare metal server. In this article, we will guide you on how to install Kubernetes on a bare metal server.
Prerequisites
Before we dive into the installation process, there are a few prerequisites that you need to meet:- A bare metal server running a Linux operating system, preferably Ubuntu 18.04 or 20.04.
- Docker installed on your server.
- A valid hostname and domain name for your server.
- An SSH client installed on your local machine.
Step 1: Disable Swap Memory
Before installing Kubernetes, we need to disable swap memory on the server. Run the following command to disable swap memory:
sudo swapoff -a
Step 2: Install Kubernetes Tools
To install Kubernetes tools on your server, run the following commands:
sudo apt-get update
sudo apt-get install -y apt-transport-https curl
curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
sudo touch /etc/apt/sources.list.d/kubernetes.list
echo "deb https://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee -a /etc/apt/sources.list.d/kubernetes.list
sudo apt-get update
sudo apt-get install -y kubelet kubeadm kubectl
Step 3: Configure Kubernetes
Now that we have installed the necessary tools, we need to configure Kubernetes. Run the following command to configure Kubernetes:
sudo kubeadm init --pod-network-cidr=10.244.0.0/16 --apiserver-cert-extra-sans=<server-ip-address>
Replace <server-ip-address> with the IP address of your server. This command will create a Kubernetes cluster with a pod network CIDR of 10.244.0.0/16.
Step 4: Set Up a Pod Network
Now we need to set up a pod network to enable communication between pods. Run the following command to set up the Flannel network:
sudo kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
Step 5: Join Worker Nodes to the Cluster
To join worker nodes to the cluster, you need to run the command provided by the kubeadm init command in Step 3 on each worker node.
sudo kubeadm join <master-node-ip-address>:<port> --token <token> --discovery-token-ca-cert-hash sha256:<hash>
Replace <master-node-ip-address> with the IP address of the master node, <port> with the port number, <token> with the token provided by the kubeadm init command in Step 3, and <hash> with the discovery token CA cert hash provided by the kubeadm init command.
Step 6: Verify Kubernetes Installation
To verify that Kubernetes is installed correctly, run the following commands:
sudo kubectl get nodes
sudo kubectl get pods --all-namespaces
These commands will show you the nodes in the cluster and all the pods running in all namespaces.
In this article, we have shown you how to install Kubernetes on a bare metal server. By following these steps, you can create a Kubernetes cluster on your own server and start managing your containerized applications. We hope you found this article helpful.
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That's it for this post. Keep practicing and have fun. Leave your comments if any.
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