Install Kubernetes without Docker

Based on article

https://www.techrepublic.com/article/how-to-install-kubernetes-on-ubuntu-server-without-docker/

requirements - cilium-cli

  brew instal cilium-cli

Installs containerd, kubernetes and initialize k8s

• Run on all nodes

install-step1.sh

sudo apt-get install containerd -y

sudo mkdir -p /etc/containerd

containerd config default | sudo tee /etc/containerd/config.toml

sudo systemctl stop containerd

curl -LO https://github.com/containerd/containerd/releases/download/v1.7.16/containerd-1.7.16-linux-amd64.tar.gz

tar xvf containerd-1.7.16-linux-amd64.tar.gz

rm containerd-1.7.16-linux-amd64.tar.gz

sudo cp bin/* /usr/bin/

sudo systemctl start containerd

rm -rf bin

sudo systemctl status containerd --lines 1

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

sudo apt-add-repository "deb http://pkgs.k8s.io/ kubernetes-xenial main"

sudo apt-get install kubeadm kubelet kubectl -y

sudo apt-mark hold kubeadm kubelet kubectl containerd

#echo 'net.bridge.bridge-nf-call-iptables = 1' | sudo tee -a /etc/sysctl.conf

SOURCE_FILE="/etc/sysctl.conf"
LINE_INPUT="net.bridge.bridge-nf-call-iptables = 1"

grep -qF "$LINE_INPUT" "$SOURCE_FILE"  || echo "$LINE_INPUT" | sudo tee -a "$SOURCE_FILE"

sudo echo '1' | sudo tee /proc/sys/net/ipv4/ip_forward

cat /proc/sys/net/ipv4/ip_forward

sudo sysctl --system

sudo modprobe overlay
sudo modprobe br_netfilter

sudo swapoff -a

sudo sed -ri '/\sswap\s/s/^#?/#/' /etc/fstab

cat /etc/fstab

Step 2 run on the primary/control plane

install-step2.sh

sudo kubeadm config images pull

IP_ADDR=`hostname -I | awk '{print $1}'`

sudo kubeadm init --pod-network-cidr=10.244.0.0/16 --apiserver-advertise-address=${IP_ADDR}

mkdir -p $HOME/.kube

sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config

sudo chown $(id -u):$(id -g) $HOME/.kube/config

kubectl apply -f https://github.com/weaveworks/weave/releases/download/v2.8.1/weave-daemonset-k8s.yaml

#kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

sudo cp ./crictl.yaml /etc/crictl.yaml

sudo crictl images

watch -n 5 "kubectl get nodes"

Step 3

• Run the join command on all worker nodes

Tools to interact with containerd

1. crictl
2. ctr

https://github.com/kubernetes-sigs/cri-tools/blob/v1.19.0/docs/crictl.md

https://github.com/containerd/cri/blob/master/docs/registry.md

https://www.systutorials.com/docs/linux/man/1-ctr/

https://docs.redislabs.com/latest/rs/installing-upgrading/configuring/linux-swap/

https://kifarunix.com/install-and-setup-kubernetes-cluster-on-ubuntu-24-04/

https://containerd.io/

Script tested with Ubuntu Server 24.04 with all updates as of 2024-05-13

1. containerd version 1.7.16
2. ctr version 1.6.31
3. crictl version 1.30.0
4. k8s version 1.30.0
5. cilium version

includes the installation of metallb.

crictl.yaml

Location of containerd.sock file is specific to Ubuntu. Change if installing on other linux distributions.

runtime-endpoint: unix:///run/containerd/containerd.sock
image-endpoint: unix:///run/containerd/containerd.sock
timeout: 2
pull-image-on-create: false

Notes:

• Shutdown of the VM runs until long timeout because it is waiting for containerd shim to shutdown.

Reached target Power-Off.
systemd-shutdown[1]: Waiting for process: containerd-shim

metrics server configuration https://serverfault.com/questions/1153770/installed-metrics-server-in-kubernetes-cluster-but-getting-serviceunavailable

https://blog.devops.dev/deploying-kube-prometheus-stack-with-persistent-storage-on-kubernetes-cluster-24473f4ea34f