Containerd and Kubernetes Installation Guide

1. Disable Swap

Turn off swap and disable it permanently.

swapoff -a
sed -i '/swap/d' /etc/fstab

2. Enable Required Kernel Modules

Create a configuration file to load necessary kernel modules and load them temporarily.

echo -e "overlay\nbr_netfilter" | sudo tee /etc/modules-load.d/containerd.conf
sudo modprobe overlay
sudo modprobe br_netfilter

3. Enable IPv4 Forwarding

Enable IPv4 forwarding in the sysctl configuration and apply the changes.

sed -i 's/#net.ipv4.ip_forward=1/net.ipv4.ip_forward=1/' /etc/sysctl.conf
sysctl -p

4. Configure Containerd

Generate the default configuration for Containerd and modify it to use systemd as the cgroup driver.

containerd config default | sudo tee /etc/containerd/config.toml
sudo sed -i 's/SystemdCgroup = false/SystemdCgroup = true/' /etc/containerd/config.toml

5. Install Kubernetes

Add the Kubernetes package repository and install the required packages.

sudo mkdir -p /etc/apt/keyrings
curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.30/deb/Release.key | sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg
echo 'deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/v1.30/deb/ /' | sudo tee /etc/apt/sources.list.d/kubernetes.list
sudo apt-get update
sudo apt-get install -y kubelet kubeadm kubectl
sudo apt-mark hold kubelet kubeadm kubectl

6. Enable kubelet

Enable and start the kubelet service.

sudo systemctl enable --now kubelet

7. Initialize the Kubernetes Cluster

Initialize the Kubernetes control plane with the specified parameters.

sudo kubeadm init --control-plane-endpoint 192.168.2.100 --apiserver-advertise-address 192.168.2.100 --pod-network-cidr 10.244.0.0/16 | tee kuber-install.log

8. Create Control Plane Join Command

Create the control plane join command and save it for later use.

sudo kubeadm init phase upload-certs --upload-certs

Copy the output certificate key and run the following command, replacing <CERTIFICATE_KEY> with the copied key.

sudo kubeadm token create --certificate-key <CERTIFICATE_KEY> --print-join-command | tee cp-command.txt

9. Join Control Plane and Worker Nodes

Use the command from cp-command.txt on your control plane nodes to join them. Additionally, get the join command for worker nodes from kuber-install.log and run it on each worker node.

This revised guide provides clear, step-by-step instructions, making it easier to follow and ensuring all necessary actions are covered.

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