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In the previous post, we have learn kubernetes basics and understand it’s components. now in this tutorial we will see how to setup 3 nodes kubernets cluster.
There is lots of tools available to setup kubernetes like Minikube, kubeadm and Kargo
I found very simple installation using Kargo ( now knows as Kubespray ). which is just ansible playbooks.
So we can see how to setup 3 node kubernetes cluster using Kargo.
Assuming that you have ready installed 3 nodes of CentOS 7.4 or higher. you can have it on Pysical server or VM or AWS or any cloud, you just need to have ssh access to this servers.
yum install python-pip git
Since Kubernetes >= 1.8, You need to disable Swap in all nodes.
Download the Kargo
git clone https://github.com/kubernetes-incubator/kubespray cd kubespray sudo pip install -r requirements.txt
Configuring the static inventory file
cp inventory/sample/hosts.ini inventory/hosts vim inventory/hosts # ## Configure 'ip' variable to bind kubernetes services on a # ## different ip than the default iface node1 ansible_ssh_host=my-host01 ip=220.127.116.11 node2 ansible_ssh_host=my-host02 ip=18.104.22.168 node3 ansible_ssh_host=my-host03 ip=22.214.171.124 # ## configure a bastion host if your nodes are not directly reachable # bastion ansible_ssh_host=x.x.x.x [kube-master] node1 node2 node3 [etcd] node1 node2 node3 [kube-node] node1 node2 node3 [k8s-cluster:children] kube-node kube-master
ansible -i inventory/hosts all -m shell -a 'uptime'
cp -a inventory/sample/group_vars inventory/group_vars vim inventory/group_vars/k8s-cluster.yml kube_basic_auth: true
It will generate random password and assign to admin user and it will store in inventory/credentials/kube_user
ansible-playbook -i inventory/hosts cluster.yml -vv --become
In case if you face any issue, you can run reset.yml playbook
Once installation is finished, you can login to node1 and check the status using following command.
kubectl get nodes