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kubeadm-installation-ubuntu20.md

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Install Kubernetes Cluster using kubeadm

Follow this documentation to set up a Kubernetes cluster on Ubuntu 20.04 LTS.

This documentation guides you in setting up a cluster with one master node and one worker node.

Assumptions

Role FQDN IP OS RAM CPU
Master kmaster.example.com 172.16.16.100 Ubuntu 20.04 2G 2
Worker kworker.example.com 172.16.16.101 Ubuntu 20.04 1G 1

On both Kmaster and Kworker

Perform all the commands as root user unless otherwise specified

Disable Firewall
ufw disable
Disable swap
swapoff -a; sed -i '/swap/d' /etc/fstab
Update sysctl settings for Kubernetes networking
cat >>/etc/sysctl.d/kubernetes.conf<<EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system
Install docker engine
{
  apt install -y apt-transport-https ca-certificates curl gnupg-agent software-properties-common
  curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add -
  add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
  apt update
  apt install -y docker-ce=5:19.03.10~3-0~ubuntu-focal containerd.io
}

Kubernetes Setup

Add Apt repository
{
  curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
  echo "deb https://apt.kubernetes.io/ kubernetes-xenial main" > /etc/apt/sources.list.d/kubernetes.list
}
Install Kubernetes components
apt update && apt install -y kubeadm=1.18.5-00 kubelet=1.18.5-00 kubectl=1.18.5-00
In case you are using LXC containers for Kubernetes nodes

Hack required to provision K8s v1.15+ in LXC containers

{
  mknod /dev/kmsg c 1 11
  echo '#!/bin/sh -e' >> /etc/rc.local
  echo 'mknod /dev/kmsg c 1 11' >> /etc/rc.local
  chmod +x /etc/rc.local
}

On kmaster

Initialize Kubernetes Cluster

Update the below command with the ip address of kmaster

kubeadm init --apiserver-advertise-address=<kube-master-ip> --pod-network-cidr=192.168.0.0/16  --ignore-preflight-errors=all
Deploy Calico network (overlay network)
kubectl --kubeconfig=/etc/kubernetes/admin.conf create -f https://docs.projectcalico.org/v3.14/manifests/calico.yaml
Cluster join command
kubeadm token create --print-join-command
To be able to run kubectl commands as non-root user

If you want to be able to run kubectl commands as non-root user, then as a non-root user perform these

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

On Kworker

Join the cluster

Use the output from kubeadm token create command in previous step from the master server and run here.

Verifying the cluster

Get Nodes status
kubectl get nodes
Get component status
kubectl get cs