- 0-PackageInstallation-containerd(plralsight).sh

#Setup
#   1. 4 VMs Ubuntu 18.04, 1 control plane, 3 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 installation, this way you can install
#       and revert to snapshot if needed
#
ssh aen@c1-cp1


#0 - 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


###IMPORTANT####
#I expect this code to change a bit to make the installation process more streamlined.
#Overall, the end result will stay the same...you'll have continerd installed
#I will keep the code in the course downloads up to date with the latest method.
################


#0 - Install Packages
#containerd prerequisites, first load two modules and configure them to load on boot
#https://kubernetes.io/docs/setup/production-environment/container-runtimes/
sudo modprobe overlay
sudo modprobe br_netfilter

cat <<EOF | sudo tee /etc/modules-load.d/containerd.conf
overlay
br_netfilter
EOF


#Setup required sysctl params, these persist across reboots.
cat <<EOF | sudo tee /etc/sysctl.d/99-kubernetes-cri.conf
net.bridge.bridge-nf-call-iptables  = 1
net.ipv4.ip_forward                 = 1
net.bridge.bridge-nf-call-ip6tables = 1
EOF


#Apply sysctl params without reboot
sudo sysctl --system


#Install containerd
sudo apt-get update
sudo apt-get install -y containerd


#Create a containerd configuration file
sudo mkdir -p /etc/containerd
sudo containerd config default | sudo tee /etc/containerd/config.toml


#Set the cgroup driver for containerd to systemd which is required for the kubelet.
#For more information on this config file see:
# https://github.com/containerd/cri/blob/master/docs/config.md and also
# https://github.com/containerd/containerd/blob/master/docs/ops.md

#At the end of this section
        [plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc]
        ...
#UPDATE: This line is now in the config.toml file
#change it from SystemdCgroup = false to SystemdCgroup = true
            SystemdCgroup = true

sudo vi /etc/containerd/config.toml


#Restart containerd with the new configuration
sudo systemctl restart containerd




#Install Kubernetes packages - kubeadm, kubelet and kubectl
#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 policy to inspect versions available in the repository
sudo apt-get update
apt-cache policy kubelet | head -n 20


#Install the required packages, if needed we can request a specific version.
#Use this version because in a later course we will upgrade the cluster to a newer version.
VERSION=1.21.0-00
sudo apt-get install -y kubelet=$VERSION kubeadm=$VERSION kubectl=$VERSION
sudo apt-mark hold kubelet kubeadm kubectl containerd

#There is a breaking change in kubernetes 1.22, I will update the course shortly for that change for now use versions less than 1.22
#To install the latest, omit the version parameters
#sudo apt-get install kubelet kubeadm kubectl
#sudo apt-mark hold kubelet kubeadm kubectl containerd


#1 - systemd Units
#Check the status of our kubelet and our container runtime, containerd.
#The kubelet will enter a crashloop until a cluster is created or the node is joined to an existing cluster.
sudo systemctl status kubelet.service
sudo systemctl status containerd.service


#Ensure both are set to start when the system starts up.
sudo systemctl enable kubelet.service
sudo systemctl enable containerd.service