Kubernetes - Worker Node Configuration

                                         

Set the Hostname for the worker node as ‘k8s-master’  

hostnamectl set-hostname ‘k8s-node’

Disable Selinux

setenforce 0

sed -i --follow-symlinks 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/sysconfig/selinux

Configure the Firewall rules

firewall-cmd --permanent --add-port=10250/tcp

firewall-cmd --permanent --add-port=10255/tcp

firewall-cmd --permanent --add-port=30000-32767/tcp

firewall-cmd --permanent --add-port=6783/tcp

firewall-cmd  --reload

Set the bridge-nf-call-iptables to 1

modprobe br_netfilter

echo "1" > /proc/sys/net/bridge/bridge-nf-call-iptables

Configure the Kubernetes Yum Repo

Create a kubernetes.repo  file under /etc/yum.repos.d/ with the below contents,

[kubernetes]

name=Kubernetes

baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64

enabled=1

gpgcheck=1

repo_gpgcheck=1

gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg

       https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg

Disable the Swap

run the command , swapoff -a

Install , Enable & Start Docker and kubeadm

yum install kubeadm docker -y

systemctl restart docker && systemctl enable docker

systemctl  restart kubelet && systemctl enable kubelet

Join the worker Node with master

Join the worker node to the master node by running the below command ,

kubeadm join 10.131.175.138:6443 --token pe7y1r.zk9u6c07g2nlwm3h --discovery-token-ca-cert-hash sha256:48dfb2c9eda08aaed84a70011221804c80adcd700e73d870fd12d041b0054641

This command is available in the output of the “kubeadm init” command in the master node.

We can see that the node has joined the master successfully.

Check the node status using the “kubectl” command as,

As we can see the master and node are connected.