You must run these commands on all nodes, including the workers ( especially cgroup enablement for containerd )
sudo swapoff -a
sudo mkdir -p /etc/apt/keyrings
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
sudo apt-get update
sudo apt-get install containerd.io
mkdir -p /etc/containerd
containerd config default > /etc/containerd/config.toml
// Set CGROUP TO TRUE ^^^^
cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf
overlay
br_netfilter
EOF
sudo modprobe overlay
sudo modprobe br_netfilter
# 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
sudo sysctl --system
curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
sudo bash -c 'cat <<EOF >/etc/apt/sources.list.d/kubernetes.list
deb https://apt.kubernetes.io/ kubernetes-xenial main
EOF'
sudo apt-get update
sudo apt-get install -y kubelet kubeadm kubectl
sudo apt-mark hold kubelet kubeadm kubectl
sudo kubeadm init --pod-network-cidr=10.244.0.0/16
Install flannel pod networking CNI
kubectl apply -f https://github.com/flannel-io/flannel/releases/latest/download/kube-flannel.yml
(Takes about 5 minutes)
Or install cilium
cilium install
WRT resetting: Most issues with the CNI ( such as flannel ) not working are because there is old config in /etc/cni/net.d or the IP link needs deletion
sudo rm -rf /etc/cni/net.d/