This script will install Kubernetes on Ubuntu 22.
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#!/bin/bash
set -e
set -u
set -o pipefail
function usage {
echo "Please supply the following settings in this order:"
echo " hostname"
echo " ip address"
echo " gateway"
echo " nameserver"
}
function banner1 {
echo "================================================================"
echo "$1"
echo "----------------------------------------------------------------"
}
# --------------------------------------------------------------------------------------------------
if [ ! -f "STEP1" ]; then
banner1 "Initial steps..."
FILE=/etc/needrestart/needrestart.conf
if [ -f "$FILE" ]; then
sudo sed -i 's/#$nrconf{restart} = '"'"'i'"'"';/$nrconf{restart} = '"'"'a'"'"';/g' $FILE
fi
# parm check
if [[ $# -ne 4 ]];
then
usage
exit 1
fi
# Just to make sure the password is loaded
sudo echo "Starting..."
sudo apt-get update && sudo apt upgrade -y
sudo apt autoremove -y
sudo apt clean -y
touch STEP1
fi
# --------------------------------------------------------------------------------------------------
if [ ! -f "STEP2" ]; then
banner1 "Setting up the network..."
HOSTNAME=$1
IP_ADDRESS=$2
GATEWAY=$3
NAMESERVERS=$4
INT_NAME=$(ip a | grep "qlen " | grep -v "lo" | cut -d ":" -f 2 | cut -d " " -f 2)
FILE="00-networks.yaml"
# Display settings
echo "Hostname: $HOSTNAME"
echo "IP: $IP_ADDRESS"
echo "Gateway: $GATEWAY"
echo "Interface name: $INT_NAME"
echo "Nameservers: $NAMESERVERS"
echo "Setting static IP address..."
echo "network:" > $FILE
echo " renderer: networkd" >> $FILE
echo " version: 2" >> $FILE
echo " ethernets:" >> $FILE
echo " $INT_NAME:" >> $FILE
echo " dhcp4: no" >> $FILE
echo " addresses:" >> $FILE
echo " - $IP_ADDRESS/24" >> $FILE
echo " routes:" >> $FILE
echo " - to: default" >> $FILE
echo " via: $GATEWAY" >> $FILE
echo " nameservers:" >> $FILE
echo " addresses:" >> $FILE
echo " - $NAMESERVERS" >> $FILE
ls -1 /etc/netplan/*.yaml | xargs -I{} sudo mv {} {}.ORG
sudo mv $FILE /etc/netplan/$FILE
# Disable IPv6
# echo "net.ipv6.conf.all.disable_ipv6 = 1" > test.dat
# echo "net.ipv6.conf.default.disable_ipv6 = 1" >> test.dat
# cat test.dat | sudo tee –a /etc/sysctl.d/15-disable-ivp6.conf
# rm test.dat
touch STEP2
fi
# --------------------------------------------------------------------------------------------------
if [ ! -f "STEP3" ]; then
sudo swapoff -a
sudo sed -ri '/\sswap\s/s/^#?/#/' /etc/fstab
touch STEP3
fi
# --------------------------------------------------------------------------------------------------
if [ ! -f "STEP4" ]; then
# Set hostname
banner1 "Setting hostname..."
sudo hostnamectl set-hostname $1
sudo tee /etc/modules-load.d/containerd.conf <<EOF
overlay
br_netfilter
EOF
sudo modprobe overlay
sudo modprobe br_netfilter
sudo tee /etc/sysctl.d/kubernetes.conf <<EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
EOF
sudo sysctl --system
touch STEP4
fi
# --------------------------------------------------------------------------------------------------
if [ ! -f "STEP5" ]; then
banner1 "Installing..."
sudo apt-get -y install curl gnupg2 software-properties-common apt-transport-https ca-certificates
sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmour -o /etc/apt/trusted.gpg.d/docker.gpg
sudo add-apt-repository -y "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
sudo apt-get update
sudo apt-get upgrade -y
sudo apt-get -y autoremove
sudo apt-get -y install containerd.io
containerd config default | sudo tee /etc/containerd/config.toml >/dev/null 2>&1
sudo sed -i 's/SystemdCgroup \= false/SystemdCgroup \= true/g' /etc/containerd/config.toml
sudo systemctl restart containerd
sudo systemctl enable containerd
touch STEP5
fi
# --------------------------------------------------------------------------------------------------
if [ ! -f "STEP6" ]; then
sudo wget -q -O /etc/apt/trusted.gpg.d/apt-key.gpg https://packages.cloud.google.com/apt/doc/apt-key.gpg
#echo " " > /etc/apt/sources.list
sudo apt-add-repository -y -S "deb http://apt.kubernetes.io/ kubernetes-xenial main"
sudo apt-get update
sudo apt-get -y upgrade
sudo apt-get install -y kubelet kubeadm kubectl
sudo apt-mark hold kubelet kubeadm kubectl
#sudo kubeadm config images pull
#sudo kubeadm init --control-plane-endpoint=192.168.1.40
touch STEP6
fi
# --------------------------------------------------------------------------------------------------
if [ ! -f "STEP7" ]; then
sudo apt autoremove
sudo apt clean
touch STEP7
fi
# --------------------------------------------------------------------------------------------------
banner1 "Completed!"
rm STEP?
banner1 "Rebooting..."
sudo reboot
# --------------------------------------------------------------------------------------------------
Run this on the master nodes only
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# Run this on the master node only:
#!/bin/bash
# Stop on error
set -e
# Stop on uninitialized variables
set -u
# Stop on failed pipes
set -o pipefail
echo Master only!!
sudo kubeadm config images pull
sudo kubeadm init --pod-network-cidr=10.244.0.0/16
After this runs, you will see something like this displayed. Copy this command to a text file as you will need it later.
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kubeadm join 192.168.1.60:6443 --token a_token \
--discovery-token-ca-cert-hash sha256:a_really_long_key
Setting kubectl to run as a non-root user
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mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
Install networking
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# get nodes will show NotReady until networking applied and everything if setup in the background.
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
watch kubectl get pods --all-namespaces
Do not proceed to the worker nodes until all of the statuses say ‘Running’
Install Metrics Server
This allows the collection of performance data of nodes and pods.
Source: https://blog.devgenius.io/how-to-install-metrics-server-on-kubernetes-cluster-60dd754873c2
If you are not using TLS certs, you will need to download this components.yaml file and add the last two lines to it.
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kubectl apply -f https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/components.yaml
Be aware that this pod starts very slowly and once started takes 5-10 minutes to start to collect information.
Joining the worker nodes to the master node
Run the command you saved off earlier. It will look something like this.
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sudo kubeadm join 192.168.1.60:6443 --token a_token \
--discovery-token-ca-cert-hash sha256:a_really_long_key
Joining new worker nodes to the master node
The above ‘join’ command is only good got a few hours. After that point, you will need to generate a new ‘join’ link.
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sudo kubeadm token create --print-join-command