Ankur Singh
Commands to establish a connection between a master and a worker node of kubernetes

Commands to establish a connection between a master and a worker node of kubernetes

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Ankur Singh
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Kubernetes, often abbreviated as K8s, is an open-source container orchestration platform that revolutionizes the way we deploy, scale, and manage containerized applications. It was originally developed by Google and is now maintained by the Cloud Native Computing Foundation (CNCF). With its robust features and capabilities, Kubernetes has become the de facto standard for managing containers in modern cloud-native environments.

Follow the below commands to establish a connection between the master node and worker node with the help of kubeadm:

Kubeadm Installation:

  • Both Master & Worker Node
sudo su
apt update -y
apt install docker.io -y

systemctl start docker
systemctl enable docker

curl -fsSL "https://packages.cloud.google.com/apt/doc/apt-key.gpg" | sudo gpg --dearmor -o /etc/apt/trusted.gpg.d/kubernetes-archive-keyring.gpg
echo 'deb https://packages.cloud.google.com/apt kubernetes-xenial main' > /etc/apt/sources.list.d/kubernetes.list

apt update -y
apt install kubeadm=1.20.0-00 kubectl=1.20.0-00 kubelet=1.20.0-00 -y

##To connect with cluster execute below commands on master node and worker node respectively
  • Master Node
sudo su
kubeadm init

  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config

kubectl apply -f https://github.com/weaveworks/weave/releases/download/v2.8.1/weave-daemonset-k8s.yaml

kubeadm token create --print-join-command
  • Worker Node
sudo su
kubeadm reset pre-flight checks
-----> Paste the Join command on worker node and append `--v=5` at end

#To verify cluster connection
  • On Master Node
kubectl get nodes 


# worker
# kubeadm join 172.31.84.66:6443 --token n4tfb4.grmew1s1unug0get     --discovery-token-ca-cert-hash sha256:c3fda2eaf5960bed4320d8175dc6a73b1556795b1b7f5aadc07642ed85c51069 --v=5
# kubeadm reset pre-flight checks
# kubeadm token create --print-join-command
# kubectl label node ip-172-31-20-246 node-role.kubernetes.io/worker=worker
# kubectl label nodes ip-172-31-92-99 kubernetes.io/role=worker
# kubectl config set-context $(kubectl config current-context) --namespace=dev

Happy Learning :)

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