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setup-kubernetes-with-kubeadmn.md

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Configure Kubernetes Cluster With Kubeadm

1. Take 3 Linux servers (I'Ve taken AWS Linux 3 servers)

  One node for master and other two workers

2. Repeate these steps on all three nodes

  • Install docker on all nodes

    sudo yum install docker -y
    sudo service docker start
    sudo chkconfig docker on

  • Adding current user to docker group (Optional)

      sudo usermod -aG docker $USER
  sudo service docker start

  • Disable swap momory

      sudo swapoff -a

  • Command to update fstab so that swap remains disabled after a reboot

      sudo sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab

  • Set SELinux in permissive mode (effectively disabling it)

      sudo setenforce 0
      sudo sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config

  • Install kubeadmn, kubectl on all three nodes

cat <<EOF | sudo tee /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-\$basearch
enabled=1
gpgcheck=1
gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
exclude=kubelet kubeadm kubectl
EOF

sudo yum install -y kubelet kubeadm kubectl --disableexcludes=kubernetes
sudo systemctl enable --now kubelet

3. Initialize kubernets cluster on Master node(Run this only on master)

sudo kubeadm init

4. Do following setup to start using kubernetes cluster(Run this only 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

5. Add pod network add-ons (Run this only on master)

kubectl apply -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')"

6. Take note of kubeadm command and run on all workers

  Run this command(replace with your command) on every node to join the cluster

  sudo kubeadm join 172.31.44.226:6443 --token f6o4a3.jdagdd4e2h8xhzy1 \
    --discovery-token-ca-cert-hash sha256:d0528baca6a2cf15bfece995d7df6f5d018b233b54251716ce2fd984148ba6d6

7. Get list of nodes in the cluster (Run this on master)

kubectly get nodes