Kubernetes Installation
- There are many different ways of installing kuberentes and also kuberentes is readily available as a Service on Cloud (Azure Kuberentes Service, Elastic Kuberentes Service, Google Kubernetes Engine)
- To start with we would be using kubeadm as an approach to create a kubernetes cluster
- Refer Here for the installation instructions
- Lets create 3 ubuntu servers
- Now install docker on the three servers and then execute the commands as mentioned in the document Refer Here
- Now install Kube-adm, kubectl and kubelet Refer Here
- Now we can create cluster using kubeadm Refer Here
- Login into the master node
sudo -i
kubeadm init --pod-network-cidr=10.244.0.0/16
- Make a note of the instructions given which appear as shown
Your Kubernetes control-plane has initialized successfully!
To start using your cluster, you need to run the following 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
Alternatively, if you are the root user, you can run:
export KUBECONFIG=/etc/kubernetes/admin.conf
You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
https://kubernetes.io/docs/concepts/cluster-administration/addons/
Then you can join any number of worker nodes by running the following on each as root:
kubeadm join 172.31.37.90:6443 --token q331we.xj6o2j07sy066v1r \
--discovery-token-ca-cert-hash sha256:e281cbdb4c7de0c621e78d42d88b2bfb7d64d454afc56d3090dca3966be76ae3
- Now exit from root user to become normal user and execute the following commands on master
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
- Now login into the nodes and execute the kubeadm command as a root user
- Now login into kuberentes (k8s) and execute
kubectl get nodes
- Now execute the following command to install pod network plugin
kubectl apply -f https://github.com/coreos/flannel/raw/master/Documentation/kube-flannel.yml
