Creating k8s cluster using kubeadm

We can have 2 or more VMs, where one will act as master and the rest will act as worker nodes.

************* Install Kubernertes on Master Node *************

1. Upgrade apt packages sudo apt-get update

2. Install Docker Engine sudo apt-get install -y docker.io

3. Install Support packages sudo apt-get install -y apt-transport-https curl

4. Retrieve the key for the Kubernetes repo and add it to your key manager curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -

5. Add the kubernetes repo to your system cat <<EOF >/etc/apt/sources.list.d/kubernetes.list deb http://apt.kubernetes.io/ kubernetes-xenial main EOF

6. Install the three pieces you’ll need, kubeadm, kubelet, and kubectl sudo apt-get update sudo apt-get install -y kubelet kubeadm kubectl sudo apt-mark hold kubelet kubeadm kubectl

7. Create the actual cluster kubeadm init --pod-network-cidr=192.168.0.0/16 (this can be any valid ntw range) all pods in the cluster will follow this cidr

Note - Notedown the Command to join cluster

8. Install the Calico network plugin kubectl apply -f https://docs.projectcalico.org/manifests/calico.yaml

9. Get Cluster Nodes kubectl get nodes

************* Install & Configure Kubernertes Worker Node *************

1. Upgrade apt packages sudo apt-get update

2. Install Docker Engine sudo apt-get install -y docker.io

3. Install Support packages sudo apt-get install -y apt-transport-https curl

4. Retrieve the key for the Kubernetes repo and add it to your key manager curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -

5. Add the kubernetes repo to your system cat <<EOF >/etc/apt/sources.list.d/kubernetes.list deb http://apt.kubernetes.io/ kubernetes-xenial main EOF

6. Install the three pieces you’ll need, kubeadm, kubelet, and kubectl sudo apt-get update sudo apt-get install -y kubelet kubeadm kubectl sudo apt-mark hold kubelet kubeadm kubectl

7. Join the Worker Nodes to the Cluster In the Control Plane Node, create the token and copy the kubeadm join command (NOTE:The join command can also be found in the output from kubeadm init command): kubeadm token create --print-join-command

8. In both Worker Nodes, paste the kubeadm join command to join the cluster: sudo kubeadm join <join command from previous command>

9. In the Control Plane Node, view cluster status (Note: You may have to wait a few moments to allow the cluster to become ready): kubectl get nodes

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