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Bootstrap Kubernetes Cluster (v1.11.2)

Follow these instructions to install Kubernetes cluster v1.11.2.

Create Ubuntu 16.04 VMs with 2vCPUs 8GB RAM 50 GB disk

For all VMs (master and nodes) perform the below

Docker CE 18.6.0

Update packages

sudo apt-get update
sudo apt-get upgrade

The below commands are taken from the docker installation guide.

sudo apt-get update

Install some utilities

sudo apt-get install \
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg-agent \
    software-properties-common

Add the key and ensure its fingerprint

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo apt-key fingerprint 0EBFCD88

Register docker repository

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

Install docker 18.06.0

sudo apt-get install docker-ce=18.06.0~ce~3-0~ubuntu containerd.io

Verify docker

sudo docker run hello-world

Turn swap off

sudo swapoff -a

Run sudo vi /etc/fstab and comment out swap partition

Invoke top and ensure swap not used

Kubelet, Kubectl, Kubeadm

Become sudo sudo -s and run the below to install the exact versions of kubernetes plane on your node

apt-get update && apt-get install -y apt-transport-https curl
curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
cat <<EOF >/etc/apt/sources.list.d/kubernetes.list
deb https://apt.kubernetes.io/ kubernetes-xenial main
EOF
apt-get update
apt-get install -qy kubelet=1.11.2-00 kubectl=1.11.2-00 kubeadm=1.11.2-00 kubernetes-cni=0.6.0-00
apt-mark hold kubelet kubeadm kubectl
sysctl net.bridge.bridge-nf-call-iptables=1

kubeadm init (master node)

Log into master node

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

Exit sudo

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://raw.githubusercontent.com/coreos/flannel/2140ac876ef134e0ed5af15c65e414cf26827915/Documentation/kube-flannel.yml

Wait until all running

kubectl get pod --all-namespaces

kubeadm join (working nodes)

Log into a node

Invoke the kubeadm join ... command that kube init printed in master node

On kubernetes master, list the nodes and ensure your VM appears

kubectl get nodes -o wide