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Installing Kubernetes

Setting up a Kubernetes Cluster on a Bare metal machine

Full Instructions are here Kubernetes Guide

Full Video Setup Kubernetes Cluster Step by Step

Prerequisites

  • Ubuntu 16.04 or higher

Master Installation

  1. First we need to escalate priviledges
sudo bash
  1. First we need to update our package source
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 -y kubelet kubeadm kubectl
apt-mark hold kubelet kubeadm kubectl
  1. Then we need to install the main commands
sudo apt-get install docker.io kubeadm kubectl kubelet kubernetes-cni

Install and Configure Docker to use systemd

# Install Docker CE
## Set up the repository:
### Install packages to allow apt to use a repository over HTTPS
apt-get update && apt-get install apt-transport-https ca-certificates curl software-properties-common

### Add Docker’s official GPG key
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add -

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

## Install Docker CE.
apt-get update && apt-get install docker-ce=18.06.2~ce~3-0~ubuntu

# Setup daemon.
cat > /etc/docker/daemon.json <<EOF
{
  "exec-opts": ["native.cgroupdriver=systemd"],
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "100m"
  },
  "storage-driver": "overlay2"
}
EOF

mkdir -p /etc/systemd/system/docker.service.d

# Restart docker.
systemctl daemon-reload
systemctl restart docker

Enable Docker. For further information on post docker installation https://docs.docker.com/install/linux/linux-postinstall/

systemctl enable docker.service

Then we need to disable swap

# Check for Swap files
cat /proc/swaps

# Disable Swap
swapoff -a

# Delete any swap entries
vi /etc/fstab
  1. Install the Cluster
kubeadm init
  1. Copy out the join command
# e.g.
kubeadm join 172.17.223.148:6443 --token mqpui3.rlwk2qz2zvq9amnc --discovery-token-ca-cert-hash sha256:50ca6ffcde8076c39b436cec47eb1b906e058f51928af468d5eb09152fa6fede
  1. Drop Down to a Regular User and install
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
  1. Install Weave Overlay Network
kubectl apply -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')"
  1. Setup Default Storage Class. You need to setup a default storage class to provision volumes and fulfill volume claims. You can create a local filesystem storage class with the following
kubectl apply -f installation/provisioner.yaml

# Details Here https://github.com/rancher/local-path-provisioner

Worker Installation

You need to repeat all the prerequisites above. If there are no worker nodes i.e. single node installation of Kubernetes, simply untaint the control pane with the following

kubectl taint nodes --all node-role.kubernetes.io/master-