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create_k8s_cluster.md

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Prerequisites

3 VMs

  • 1 - Master node
  • 2 - worker node
  • 3 - worker node

Install Kubernetes

On all 3 nodes

Add repositories

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

sudo add-apt-repository    "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
   $(lsb_release -cs) \
   stable"

curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -

cat << EOF | sudo tee /etc/apt/sources.list.d/kubernetes.list
deb https://apt.kubernetes.io/ kubernetes-xenial main
EOF

Install Docker and K8S

sudo apt-get update

sudo apt-get install -y docker-ce=18.06.1~ce~3-0~ubuntu kubelet=1.14.5-00 kubeadm=1.14.5-00 kubectl=1.14.5-00

sudo apt-mark hold docker-ce kubelet kubeadm kubectl

Enable iptables bridge

echo "net.bridge.bridge-nf-call-iptables=1" | sudo tee -a /etc/sysctl.conf

sudo modprobe br_netfilter

sudo sysctl -p

On Master node only

Initialize the cluster

Change from 0 to 1

sudo nano /proc/sys/net/ipv4/ip_forward

Change it also in /etc/sysctl.conf and run

sudo sysctl -p

Initialize the cluster

sudo kubeadm init --pod-network-cidr=10.244.0.0/16

Setup kubeconfig

mkdir -p $HOME/.kube

sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config

sudo chown $(id -u):$(id -g) $HOME/.kube/config

Install Flannel networking

kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/bc79dd1505b0c8681ece4de4c0d86c5cd2643275/Documentation/kube-flannel.yml

On each worker node

Copy from initializing master output following items:

  • IP
  • token
  • hash

Run command for node joining to master

sudo kubeadm join $master_ip:6443 --token $token --discovery-token-ca-cert-hash $hash

Check k8s cluster

On master node

kubectl get nodes

You should see all nodes with a status of Ready

NAME                      STATUS   ROLES    AGE   VERSION
mkivanov1.vagrant.local   Ready    master   54m   v1.13.4
mkivanov2.vagrant.local   Ready    <none>   49m   v1.13.4
mkivanov3.vagrant.local   Ready    <none>   49m   v1.13.4