containerd-install.sh

echo "Make script executable using chmod u+x FILE_NAME.sh"

echo "Containerd installation script"
echo "Instructions from https://kubernetes.io/docs/setup/production-environment/container-runtimes/"

echo "Creating containerd configuration file with list of necessary modules that need to be loaded with containerd"
cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf
overlay
br_netfilter
EOF

echo "Load containerd modules"
sudo modprobe overlay
sudo modprobe br_netfilter


echo "Creates configuration file for kubernetes-cri file (changed to k8s.conf)"
# sysctl params required by setup, params persist across reboots
cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-iptables  = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.ipv4.ip_forward                 = 1
EOF

echo "Applying sysctl params"
sudo sysctl --system


echo "Verify that the br_netfilter, overlay modules are loaded by running the following commands:"
lsmod | grep br_netfilter
lsmod | grep overlay

echo "Verify that the net.bridge.bridge-nf-call-iptables, net.bridge.bridge-nf-call-ip6tables, and net.ipv4.ip_forward system variables are set to 1 in your sysctl config by running the following command:"
sysctl net.bridge.bridge-nf-call-iptables net.bridge.bridge-nf-call-ip6tables net.ipv4.ip_forward

echo "Update packages list"
sudo apt-get update

echo "Install containerd"
sudo apt-get -y install containerd

echo "Create a default config file at default location"
sudo mkdir -p /etc/containerd
sudo containerd config default | sudo tee /etc/containerd/config.toml

echo "Restarting containerd"
sudo systemctl restart containerd