Minimal K8s for CentOS

This page introduces how to install a Minimal K8s for CentOS.

Resource Preparation

• Prepare two nodes for K8s.

  Node	Recommended Spec.	Operating system and CPU arch.
  k8s_master	2core , 8GB mem , 100GB disk	CentOS 7/8, Rockey Linux , amd64
  k8s_node1	8core , 16GB mem , 200GB disk	CentOS 7/8, Rockey Linux , amd64

Procedure

1. Log in the k8s_master node and execute the script blow.

   /bin/bash -c "$(curl -fsSL https://bladepipe-docker.s3.ap-southeast-1.amazonaws.com/install_centos_k8s.sh)"

2. Wait to finish, then replace the local_ip in blow and execute.

   kubeadm init \
        --apiserver-advertise-address=<local_ip> \
        --kubernetes-version v1.28.15 \
        --service-cidr=10.96.0.0/12 \
        --pod-network-cidr=10.244.0.0/16 \
        --ignore-preflight-errors=Swap

   信息

   Record the kubeadm join command output after executing the script.

3. Prepare K8s configuration.

   mkdir -p $HOME/.kube
   sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
   sudo chown $(id -u):$(id -g) $HOME/.kube/config
   
   # if user is root
   export KUBECONFIG=/etc/kubernetes/admin.conf

4. Install the CNI network plugin and wait for all Pods to be READY.

   kubectl apply -f https://docs.projectcalico.org/manifests/calico.yaml
   
   watch kubectl get pods -n kube-system

5. Log in the k8s_node1 node and execute the script blow.

   /bin/bash -c "$(curl -fsSL https://bladepipe-docker.s3.ap-southeast-1.amazonaws.com/install_centos_k8s.sh)"

6. Still in the k8s_node1 node, execute the kubeadm join command recorded above.

7. Return to k8s_master node, execute the script below until all nodes' STATUS to READY.

   watch kubectl get nodes