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Operations on the Master Node

Initialize the cluster on the master node.

  1. Download the image.
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    kubeadm config images pull

    If no error is reported, the download is successful.

  1. Initialize the cluster.
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    kubeadm init --pod-network-cidr=10.244.0.0/16

    After the initialization is successful, information shown in Figure 1 is displayed.

    Figure 1 Cluster initialization success

    Run the commands in the yellow box in Figure 1 to configure the cluster. Content in the red box indicates the token commands for adding the worker node to the cluster. Save the commands.

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    rm -rf $HOME/.kube
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

    If the master node fails to be initialized, locate the cause as prompted, reset the cluster, and run the initialization command again. Reset commands:

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    kubeadm reset
systemctl stop kubelet
rm -rf /var/lib/cni/
rm -rf /var/lib/kubelet/*
rm -rf /etc/cni/
ifconfig cni0 down
ifconfig flannel.1 down
ip link delete cni0
ip link delete flannel.1
  2. Start the kube-flannel network plugin.
    Obtain the DemoVideoEngine.tar.gz software package based on Video Stream Engine, and upload the software package to the /home/k8s directory on the server.
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    cd /home/k8s
tar -xvf DemoVideoEngine.tar.gz
cd /home/k8s/k8s/script
kubectl apply -f kube-flannel.yml
  3. Check the cluster status.
    1. Check the status of the current node.
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      kubectl get nodes -A -o wide

      It is expected that the STATUS column of the master node is Ready and the CONTAINER-RUNTIME column is containerd://x.x.x.

    2. Check the Pod status.
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      kubectl get pod -A -o wide

      It is expected that the STATUS column of all Pods is Running.

    If the status of the current node is NotReady and the error message "Network plugin returns error: cni plugin not initialized" is displayed when you run the systemctl status kubelet command to check the kubelet service status, you are advised to reset the cluster, restart the server, and initialize the cluster again.