Kubernetes-Installation-on-Ubuntu-20.04-LTS

This repo is for Installation of latest version of docker & k8s cluster on Ubuntu 20.04 LTS

Please follow from step 1 to step 3 on every node, step 4 & step 5 only on master node and step 6 only on worker nodes.

Step 1: Update & Upgrade The Servers

Once the servers are ready, update them.

sudo apt update

After updating,upgrade the servers

sudo apt -y upgrade

Step 2: Install Docker, kubelet, kubeadm and kubectl

Add the GPG key for Docker

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

Add docker Repo

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

Add the GPG key for kubernetes

curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -

Add the kubernetes repository

cat << EOF | sudo tee /etc/apt/sources.list.d/kubernetes.list
deb https://apt.kubernetes.io/ kubernetes-xenial main
EOF

Update the repository

sudo apt update

Install Docker and Kubernetes packages.

if you want to know the latest kubelet , kubeadm and kubectl versions run below commands

apt update
apt-cache madison kubeadm

find the latest 1.24 version in the list it should look like 1.24.x-00, where x is the latest patch


sudo apt-get install -y docker-ce=5:20.10.7~3-0~ubuntu-$(lsb_release -cs) kubelet=1.24.4-00 kubeadm=1.24.4-00 kubectl=1.24.4-00

To hold the versions so that the versions will not get accidently upgraded.

sudo apt-mark hold docker-ce kubelet kubeadm kubectl

Start and enable Docker Services

sudo systemctl restart docker

sudo systemctl enable docker

Confirm installation by checking the version of kubectl

kubectl version --client && kubeadm version

Step 3: Disable Swap

Turn off swap

sudo swapoff -a

Enable the iptables bridge(Set a value in the sysctl file , to allow proper network settings for Kubernetes on all the servers)

echo "net.bridge.bridge-nf-call-iptables=1" | sudo tee -a /etc/sysctl.conf

Reload sysctl

sudo sysctl -p

Step 4 & Step 5 installation has to be done only on Master Node.

Step 4: Initialize master node

For Flannel Network

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

For calico Network

sudo kubeadm init --pod-network-cidr=192.168.0.0/16

NOTE:- if you receive the below error after running the "kubeadm init" command

#[init] Using Kubernetes version: v1.24.4 #[preflight] Running pre-flight checks #error execution phase preflight: [preflight] Some fatal errors occurred:

[ERROR CRI]: container runtime is not running: output: E0820 19:06:35.025990 6022 remote_runtime.go:925] "Status from runtime service failed" #err="rpc error: code = Unimplemented desc = unknown service runtime.v1alpha2.RuntimeService"

#time="2022-08-20T19:06:35Z" level=fatal msg="getting status of runtime: rpc error: code = Unimplemented desc = unknown service #runtime.v1alpha2.RuntimeService" #, error: exit status 1 #[preflight] If you know what you are doing, you can make a check non-fatal with --ignore-preflight-errors=... #To see the stack trace of this error execute with --v=5 or higher

run the following commands

sudo rm -rf /etc/containerd/config.toml

sudo systemctl restart containerd

after the above commands run again "kubeadm init" command

To start using the cluster with current user.

mkdir -p $HOME/.kube

sudo cp -f /etc/kubernetes/admin.conf $HOME/.kube/config

sudo chown $(id -u):$(id -g) $HOME/.kube/config

To check the Check cluster status:

kubectl cluster-info

Step 5: Install network plugin on Master

To Set with flannel networking

kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

To Set with Calico networking

kubectl apply -f https://docs.projectcalico.org/manifests/calico.yaml

Step 6: Add worker nodes

Joining the node to the cluster:

use sudo before kubeadm join

Please do not copy this command, this is just an example

sudo kubeadm join $controller_private_ip:6443 --token $token --discovery-token-ca-cert-hash $hash

kubeadm join 10.154.0.17:6443 --token wq09wc.wc8t2a26nj73yxst
--discovery-token-ca-cert-hash sha256:336a0df8d9292275bd6157a5550b0922f3723cf5d8d4c84ea702bfdfb9af5584 ```

TIP

If the joining code is lost, it can be retrieved using below command

kubeadm token create --print-join-command

Now please login to the master node and check whether the worker nodes has joined the cluster or not.

Using below command

kubectl get nodes

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