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Minimal K8s for CentOS

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

Resource Preparation​

  • Prepare two nodes for K8s.

    NodeRecommended Spec.Operating system and CPU arch.
    k8s_master2core , 8GB mem , 100GB diskCentOS 7/8, Rockey Linux , amd64
    k8s_node18core , 16GB mem , 200GB diskCentOS 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
    info

    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