dineshfsspersonal / kubernetes-installations

Setting up a Kubernetes Cluster with WeaveNet Addon

This guide will walk you through the process of setting up a Kubernetes cluster using kubeadm and installing the WeaveNet network addon.

Prerequisites

Before you begin, make sure you have the following prerequisites:

• Two or more Ubuntu servers (Master and Slaves) with a fresh installation.
• SSH access to the servers.
• Root or sudo privileges.

Installation Steps

On Both Master and Slave Nodes

1. Update the package list and upgrade installed packages:

   sudo apt update

2. Disable swap to ensure Kubernetes can manage memory efficiently:

   sudo swapoff -a

3. Comment out any existing swap entries in the /etc/fstab file:

   sudo sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab

4. Update the package list again:

   sudo apt-get update

5. Install required packages:

   sudo apt-get install -y apt-transport-https ca-certificates curl

6. Create a directory for keyrings:

   sudo mkdir -m 755 /etc/apt/keyrings

7. Add Kubernetes repository keyring:

   curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.28/deb/Release.key | sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg

8. Add Kubernetes repository to the sources list:

   echo 'deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/v1.28/deb/ /' | sudo tee /etc/apt/sources.list.d/kubernetes.list

9. Update the package list again:

   sudo apt-get update

10. To check available versions of kubectl:

    apt list -a kubectl

11. To check available versions of kubeadm:

    apt list -a kubeadm

12. To check available versions of kubelet:

    apt list -a kubelet

13. Install Kubernetes components (kubelet, kubeadm, containerd) and kubectl (only on Master):

    sudo apt-get install -y kubelet kubeadm containerd kubectl -y

14. Verify the Kubernetes and kubeadm versions:

    kubectl version
    kubeadm version

15. Load necessary kernel modules:

    modprobe overlay
    modprobe br_netfilter

16. Configure sysctl settings for Kubernetes:

    cat <<EOF | sudo tee /etc/sysctl.d/99-kubernetes-cri.conf
    net.bridge.bridge-nf-call-iptables = 1
    net.bridge.bridge-nf-call-ip6tables = 1
    net.ipv4.ip_forward = 1
    EOF
    sysctl --system

17. Create a containerd configuration file:

    mkdir -p /etc/containerd
    containerd config default | sudo tee /etc/containerd/config.toml

18. Restart the containerd service:

    systemctl restart containerd

19. Reload systemd to recognize new units:

    systemctl daemon-reload

20. Start and enable the kubelet service:

    systemctl start kubelet
    systemctl enable kubelet.service

21. Check the status of the kubelet service:

    systemctl status kubelet

On the Master Node

22. Initialize the Kubernetes cluster:

    kubeadm init

23. To start using your cluster, run the following commands as a regular user (replace <master-node-IP> with your Master Node's IP address):

    mkdir -p $HOME/.kube
    sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
    sudo chown $(id -u):$(id -g) $HOME/.kube/config

24. Create a token for nodes to join the cluster (use the provided command):

    kubeadm token create --print-join-command

25. Install the WeaveNet network addon by applying the following YAML file:

    kubectl apply -f https://github.com/weaveworks/weave/releases/download/v2.8.1/weave-daemonset-k8s.yaml

Now your Kubernetes cluster is set up with the WeaveNet network addon.

For more information on Kubernetes network addons, refer to the official documentation.