Kubernetes with Containerd on Ubuntu

k8s-containerd-single-node.md

Steps to install k8s with containerd

Containerd

https://github.com/containerd/containerd/blob/master/docs/getting-started.md#starting-containerd

containerd config default > /etc/containerd/config.toml

https://kubernetes.io/docs/setup/production-environment/container-runtimes/#systemd

vim /etc/containerd/config.toml (systemd_cgroup = true)

sudo containerd

Installing Kubernetes tools

https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/install-kubeadm/

Prepare Iptables

cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sudo sysctl --system

Installing Kube tools

sudo apt-get update && sudo apt-get install -y apt-transport-https curl
curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
cat <<EOF | sudo tee /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

Creating Cluster using Kubeadm

https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/create-cluster-kubeadm/

Starting Kubeadm

kubeadm config images pull # you should logs in containerd
kubeadm init

Error node not found

systemctl status kubelet.service 

https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/install-kubeadm/#configure-cgroup-driver-used-by-kubelet-on-control-plane-node

vim /var/lib/kubelet/config.yaml (cgroupDriver = "systemd")
systemctl daemon-reload
systemctl restart kubelet

Normal user

mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

Pods will be in pending state

kubectl get pods —all-namespaces
systemctl status kubelet.service

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

Configuring CNI

https://github.com/containerd/containerd/blob/master/docs/getting-started.md#starting-containerd

mkdir -p /etc/cni/net.d

cat >/etc/cni/net.d/10-mynet.conf <<EOF
{
	"cniVersion": "0.2.0",
	"name": "mynet",
	"type": "bridge",
	"bridge": "cni0",
	"isGateway": true,
	"ipMasq": true,
	"ipam": {
		"type": "host-local",
		"subnet": "10.22.0.0/16",
		"routes": [
			{ "dst": "0.0.0.0/0" }
		]
	}
}
EOF

cat >/etc/cni/net.d/99-loopback.conf <<EOF
{
	"cniVersion": "0.2.0",
	"name": "lo",
	"type": "loopback"
}
EOF