Installing Kubeadm, Kubelet, and Kubectl.txt

# CHAPTER 2.4 - Installing Kubeadm, Kubelet, and Kubectl
# https://learn.acloud.guru/course/2e0bad96-a602-4c91-9da2-e757d32abb8f/learn/56bea242-4b92-4bcb-ad80-f974467c8d7a/097bb262-1d4a-4870-9d1c-498ad730c348/watch

# For this lesson, we recommend creating 3 Ubuntu 22.04 - Jammy Jellyfish servers with 3 units each.

# Here are the commands used to install the Kubernetes components in this lesson. Run these on all three servers.

# Install dependency packages:

sudo apt-get update && sudo apt-get install -y apt-transport-https ca-certificates curl gpg software-properties-common

# Download and add GPG key:

sudo mkdir -p /etc/apt/keyrings && curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.31/deb/Release.key | sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg

# Allow unprivileged APT programs to read this keyring

sudo chmod 644 /etc/apt/keyrings/kubernetes-apt-keyring.gpg

# Add Kubernetes to repository list:

echo 'deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/v1.31/deb/ /' | sudo tee /etc/apt/sources.list.d/kubernetes.list

# Helps tools such as command-not-found to work correctly

sudo chmod 644 /etc/apt/sources.list.d/kubernetes.list

# Update package listings:

sudo apt-get update

# Install Kubernetes packages. Note: use the following command "sudo kill -9 $( sudo lsof /var/lib/dpkg/lock-frontend | awk '{ print $2 }' | tail -1 )" if you receive a "E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), is another process using it?" message.

sudo apt-get install -y kubelet kubeadm kubectl

# Turn off automatic updates:

sudo apt-mark hold kubelet kubeadm kubectl

# Enable the kubelet service:

sudo systemctl enable --now kubelet