Kubernetes package install from package manager

#Setup 

#   1. 3 VMs Ubuntu 16.04.5 or 18.04.1.0, 1 master, 2 nodes.

#   2. Static IPs on individual VMs

#   3. /etc/hosts hosts file includes name to IP mappings for VMs

#   4. Swap is disabled

#   5. Take snapshots prior to installations, this way you can install 

#       and revert to snapshot if needed

#Disable swap, swapoff then edit your fstab removing any entry for swap partitions

#You can recover the space with fdisk. You may want to reboot to ensure your config is ok. 

swapoff -a

vi /etc/fstab

#Add Google's apt repository gpg key

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

#Add the Kubernetes apt repository

sudo bash -c 'cat <<EOF >/etc/apt/sources.list.d/kubernetes.list

deb https://apt.kubernetes.io/ kubernetes-xenial main

EOF'

#Update the package list and use apt-cache to inspect versions available in the repository

sudo apt-get update

apt-cache policy kubelet | head -n 20 

apt-cache policy docker.io | head -n 20 

#Install the required packages, if needed we can request a specific version

sudo apt-get install -y docker.io kubelet kubeadm kubectl

sudo apt-mark hold docker.io kubelet kubeadm kubectl

#Check the status of our kubelet and our container runtime, docker.

#The kubelet will enter a crashloop until it's joined. 

sudo systemctl status kubelet.service 

sudo systemctl status docker.service 

#Ensure both are set to start when the system starts up.

sudo systemctl enable kubelet.service

sudo systemctl enable docker.service

# Setup Docker daemon. This is a change that has been added since the recording of the course.

sudo bash -c 'cat > /etc/docker/daemon.json <<EOF

{

  "exec-opts": ["native.cgroupdriver=systemd"],

  "log-driver": "json-file",

  "log-opts": {

    "max-size": "100m"

  },

  "storage-driver": "overlay2"

}

EOF'

#Restart reload the systemd config and docker

sudo systemctl daemon-reload

sudo systemctl restart docker