kubernetes installation using kubeadm

kubernetes installation using kubeadm

OS Required: Ubuntu 16 - xenial 



Master node creation   
---------------------------

The first step of initialising the cluster is to launch the master node. 
The master is responsible for running the control plane components, etcd and the API server.

Step 1: (optional)

       sysctl net.bridge.bridge-nf-call-iptables=1

Step2:

       apt-get update && apt-get install -y apt-transport-https
       
       
       curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
       
       
       cat <<EOF >/etc/apt/sources.list.d/kubernetes.list
       deb http://apt.kubernetes.io/ kubernetes-xenial main
EOF
       
       
       apt-get update
       
       apt-get install -y kubelet kubeadm kubectl
       
       apt-get install docker.io
       
       apt-get install docker
       
       systemctl start docker.service
       
       systemctl status docker.service                  # check the status of the docker service


Step3: Creating a master node by initializing using kubeadm

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


Step4: To start using your cluster, you need to run (as a regular user):

       mkdir -p $HOME/.kube
       sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
       sudo chown $(id -u):$(id -g) $HOME/.kube/config
       
Step5: copy the join token to a text editor   
       
        #### IMPORTANT ####
       
       |-------------------------------------------------------------|
       |     Check the output and copy the  kubeadm join             |
       |-------------------------------------------------------------|
     
        ###################
        
        
Creation of a worker node
  ---------------------------
  
  Step 1:(optional)

       sysctl net.bridge.bridge-nf-call-iptables=1

Step2:

       apt-get update && apt-get install -y apt-transport-https
       
       curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
       
       
       cat <<EOF >/etc/apt/sources.list.d/kubernetes.list
       deb http://apt.kubernetes.io/ kubernetes-xenial main
EOF

       apt-get update
       
       apt-get install -y kubelet kubeadm kubectl
       
       apt-get install docker.io
       
       apt-get install docker
       
       systemctl start docker.service
       
       systemctl status docker.service                  # check the status of the docker service

       
Step3:  kubeadm join --token <token> <master-ip>:<master-port> --discovery-token-ca-cert-hash sha256:<hash> 


At this point, the Nodes may not be ready. This is because the Container Network Interface has not been deployed. 
This will fix in the next step 


Network Creation using Flannel
--------------------------------------


Step 1: Enter into master node 

Ste2:   Check the status of the node using the following commands

        Kubectl get nodes   #  Nodes will be showing NotReady due to the abscence of network creation settings
        
Step3: 

        kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/v0.9.0/Documentation/kube-flannel.yml
        
Step4:  Check the status of the node using the following commands

        Kubectl get nodes  # Now the status of the node will be changed to Ready
        
        
        
  |-------------------------------------------------------------------------------|      
  |  Your Cluster is ready ..... Happy coding and deployment :-))                 |
  |-------------------------------------------------------------------------------|     


For any doubts reachout to me 


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Reset the cluster

sudo kubeadm reset