Kubernetes | Help Instance

Create a cluster

From the VM template, clone at least one VM for a controller and one for a worker node
Select mode “Full clone”
Controller node should at least have 2 cores and 2G of memory
Worker nodes should at least have 2 cores and 1G of memory (pref. 2G memory is better)
Resize each VM disk size to eg. 20G for installing additional components
Select "Start at boot" (optionally)
For each node:
1. Start the new VM and wait till cloud-init has finished completely
2. Login with credentials from template
3. Run “ip a” to check network connectivity
4. Run “sudo apt install -y qemu-guest-agent”
5. Reboot VM

Install container runtime (on each node)

sudo apt install -y containerd
systemctl status containerd
sudo mkdir /etc/containerd
containerd config default | sudo tee /etc/containerd/config.toml

Edit config.toml file and look for line “SystemdCgroup = false”
Change setting to “true”

Disable swap memory (if needed)

swapoff -a

Comment line in /etc/fstab

Configure network and kernel modules

Edit /etc/sysctl.conf
Look for line “net.ipv4.ip_forward=1” and uncomment it
(Optionally) do similar for ipv6
Edit /etc/modules-load.d/k8s.conf
Enter line “br_netfilter” and line "overlay"

sudo modprobe br_netfilter
sudo modprobe overlay
sudo reboot

Install Kubernetes binaries

echo 'deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/v1.28/deb/ /' | sudo tee /etc/apt/sources.list.d/kubernetes.list
curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.28/deb/Release.key | sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg
sudo apt update
sudo apt install -y kubeadm kubectl kubelet
sudo apt-mark hold kubelet kubeadm kubectl

Specifics for the control plane nodes

To start a new control plane, execute below command:

sudo kubeadm init —control-plane-endpoint=<ip-address of the VM> —pod-network-cidr=10.244.0.0/16

Note that the token expires. To create a new one, execute:

kubeadm token create --print-join-command