Install Kubeadm
Install Kubeadm with the following steps:
https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/install-kubeadm/
Error with running kubeadm init
Error can be caused by containerd running.
Error seen: "[ERROR CRI]: container runtime is not running: output: time="2024-05-27T17:40:33+01:00" level=fatal msg="validate service connection: validate CRI v1 runtime API for endpoint \"unix:///var/run/containerd/containerd.sock\": rpc error: code = Unimplemented desc = unknown service "
fix by deleting the containerd config file and restarting containerd:
rm /etc/containerd/config.toml
systemctl restart containerd
kubeadm init
You may need to open the following ports to allow nodes to communicate with the control plane:
sudo firewall-cmd --permanent --add-port=6443/tcp
sudo firewall-cmd --permanent --add-port=2379-2380/tcp
sudo firewall-cmd --permanent --add-port=10250/tcp
sudo firewall-cmd --permanent --add-port=10251/tcp
sudo firewall-cmd --permanent --add-port=10252/tcp
sudo firewall-cmd --permanent --add-port=10255/tcp
sudo firewall-cmd –reload
Then open the following ports on the worker nodes:
sudo firewall-cmd --permanent --add-port=10251/tcp
sudo firewall-cmd --permanent --add-port=10255/tcp
firewall-cmd --reload
Create Pod
Create pod with the following command:
kubectl apply -f pod.yaml #apply the config in the .yaml file
inspect the pods conents:
ps auxf
use ctl command to see base info:
sudo ctr --namespace=k8s.io containers ls
See running containers in the pod using ctl:
sudo crictl ps