Kubernetes setup Ubuntu 20.04.3 LTS - Part 1

Oktober 17, 2021 - Lesezeit: 3 Minuten

There are many tutorials out there for the first steps with Kubernetes but most of them did not work out of the box so I place here a solution which worked for me very well on the actual Ubuntu 20.04 LTS

Base image is an Ubuntu 20.04 minimal installation with SSH access, you need to have access to the root account

Update Repo and System:

apt update && apt upgrade

I set the hostname according to the use of the server in this case it is the first node and master of my kubernets project

hostnamectl set-hostname master-node

Kubernets requires that swap is disabled:

swapoff -a && sed -i '/ swap / s/^/#/' /etc/fstab

Download the docker repo key:

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

Adding the docker repo to your server:

add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"

Install docker on ubuntu without snap

apt install docker-ce docker-ce-cli containerd.io -y

Start the docker service and set it to autostart

systemctl start docker && systemctl enable docker


Adding Docker Service Fix:

cat <<EOF | sudo tee /etc/docker/daemon.json
{
"exec-opts": ["native.cgroupdriver=systemd"],
"log-driver": "json-file",
"log-opts": {
"max-size": "100m"
},
"storage-driver": "overlay2"
}
EOF

Restart the docker service to accept the fix

systemctl restart docker

Install required packages for Kubernets

apt -y install curl apt-transport-https

Add the Kubernets repo key

curl -fsSLo /usr/share/keyrings/kubernetes-archive-keyring.gpg https://packages.cloud.google.com/apt/doc/apt-key.gpg

Add the Kubernets repo to your server

echo "deb [signed-by=/usr/share/keyrings/kubernetes-archive-keyring.gpg] https://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee /etc/apt/sources.list.d/kubernetes.list

Update your repolist

apt update

Install Kubernets and Kubeadm

apt-get -y install kubeadm kubelet kubectl

Check the installation and the version of the installed packages

kubeadm version && kubelet --version && kubectl version

Start an intial preflight test with kubernetes (this will take up to 10min)

kubeadm init --pod-network-cidr=10.244.0.0/16



This steps are also avaiable via ansible playbook on my GitHub Accout:

https://github.com/dawdad/ansible-playbooks

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