We are required to set up a Kube config to access the Kubernetes cluster. Running kubeadm init will create a control plane node kubeadm init -upload-certs | tee kubeadm-init.out ip addr show -> You will see output with 10.130.0.x that will be the NAT Network IpAddress vim /etc/hosts -> Add the following content 10.130.0.5 k8scp Setup the network so it will be easier to use the hostname rather than the IP address later. vim /etc/apt//kubernetes.list -> Add the following content into kubernetes.list deb kubernetes-xenial main curl -s | apt-key add - apt-get update apt-get install -y kubeadm=1.22.1-00 kubelet=1.22.1-00 kubectl=1.22.1-00 apt-mark hold kubelet kubeadm kubectl kubectl is a command line tool that runs commands against the clusters. kubelet is a primary node agent that runs each node. kubeadm is a tool that we will be using to init control plane node and join worker node.

You will require kubeadm, kubeletand kubectl when installing Kubernetes cluster nodes. modprobe overlay modprobe br_netfilter vim /etc/sysctl.d/k8s.conf -> Add the following content into k8s.conf -nf-call-iptables = 1 _forward = 1 -nf-call-ip6tables = 1 sysctl -system export OS=xUbuntu_20.04 export VER=1.22 export WEBSITE= echo 'deb $WEBSITE/repositories/devel:/kubic:/libcontainers:/stable:/cri-o:/$VER/$OS/ /' | tee -a /etc/apt//cri-0.list curl -L $WEBSITE/repositories/devel:/kubic:/libcontainers:/stable:/cri-o:/$VER/$OS/Release.key | apt-key add - echo 'deb $WEBSITE/repositories/devel:/kubic:/libcontainers:/stable/$OS/ /' | tee -a /etc/apt//libcontainers.list curl -L $WEBSITE/repositories/devel:/kubic:/libcontainers:/stable/$OS/Release.key | apt-key add - apt-get update apt-get install -y cri-o cri-o-runc systemctl daemon-reload systemctl enable crio systemctl start crio systemctl status crio

This example uses CRI-O however we can also install other container runtimes such as Docker that uses containerd. So, we will need to install a container runtime before installing Kubernetes. Kubernetes is a platform for container orchestration and CRI is a Kubernetes API that interacts with different container runtimes.

sudo -i apt-get update & apt-get upgrade -y apt-get install -y vimĢ.2) Container runtime interface installation We will install tools such as Vim, which we will use later when setting up the Kubernetes. Voila, the Ubuntu installation is complete.

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