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Install Kubernetes - CentOS

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All the packages introduced below can be download from the link:

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https://pan.baidu.com/s/1lWLyyT1jAbADGuxEG3m4gA
\nPassword: ge4d

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Environment Requirement

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Installation Package Preparation

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Path: iManager部署包/软件工具包/Kubernetes离线安装包/kubernetes-1.15.1-centos-7.5-deploy.zip

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Install Kubernetes Master Node

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Unzip Kubernetes-1.15.1-centos-7.5-deploy.zip, copy the offline-Kubernetes-1.15-centos.tar.gz package to any directory of the machine.

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Unzip:

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tar -zxf offline-kubernetes-1.15-centos.tar.gz
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Enter the directory that you unzipped:

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cd offline-kubernetes-1.15-centos
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Execute the following command with root permission:

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chmod +x install.sh && ./install.sh master
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Notes:

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If you have multiple network cards on the machine, please assign one network card for Kubernetes, execute the command --apiserver-advertise-address IP(replace the IP in the command to the actual IP of network card). For instance, if the IP of network card is 172.16.16.9, the completely command should be chmod +x install.sh && ./install.sh --apiserver-advertise-address 172.16.16.9.

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After installing, you can visit Kubernetes UI by the address http://IP:31234, please replace the IP by the actual IP.

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It is ready to install and use iManager after installing the Kubernetes master node. By the increase of demands, add Kubernetes worker nodes anytime.

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Install Kubernetes Worker Node(Optional)

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If you need to install the Kubernetes worker node, please prepare another machine, the worker node can not be installed on the same machine of master node.

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  1. \n

    Execute the command on the worker node to set the node name. If you have multiple node machines, you could set the names like node1, node2, node3…

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    # Modify node name\nhostnamectl set-hostname node1
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    2. \n
  2. \n

    Put the offline-kubernetes-1.15-centos.tar.gz package in any directory of the Kubernetes worker node machine and unzip:

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    tar -zxvf offline-kubernetes-1.15-centos.tar.gz
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    3. \n
  3. \n

    Enter the directory that you unzipped:

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    cd offline-kubernetes-1.15-centos
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    4. \n
  4. \n

    Execute the command on the Kubernetes master node to achieve the token:

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    kubeadm token list
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    5. \n
  5. \n

    Install worker node:

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    chmod +x install.sh && ./install.sh join <master-ip>:6443 --token <kubernetes-token>
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    Notes:

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    • <master-ip> is the IP of master node.
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    • <kubernetes-token> is the token achieved in step 5.
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    • If you have multiple network cards on the machine, please assign one network card for Kubernetes, execute the command --apiserver-advertise-address IP(replace the IP in the command to the network card’s actual IP). For instance, if the IP of network card is 172.16.16.10, the completely command should be chmod +x install.sh && ./install.sh join <master‐ip>:6443 ‐‐token <kubernetes‐token> ‐‐apiserver‐advertise‐address 172.16.16.10.
      • \n
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    6. \n
  6. \n

    Execute the command in master node to verify if the worker node joined the cluster:

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    kubectl get nodes
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    7. \n
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FAQ

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  1. \n

    If you could not achieve the token from the master node, please execute the following command on the master node:

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    kubeadm token create
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    2. \n
  2. \n

    If the error in below occurs when installing the worker node, it means the token was expired, you need to create a new token in the master node by the command ‘Kubeadm token create’.

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    Error:

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    couldn't validate the identify of the API server: abort connection to API server after timeout of 5m0s
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    3. \n
  3. \n

    If you want to remove the worker node from Kubernetes cluster, execute the command on the master node:

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    kubectl delete node <nodeName>
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    Notes:

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    <nodeName> is the name of the worker node you would like to remove.

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    4. \n
  4. \n

    Please execute the following command to reset the removed node.

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    kubeadm reset
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    5. \n
  5. \n

    If you want to rejoin the removed worker node in the Kubernetes cluster, please execute the command:

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    kubeadm join <master-ip>:6443 --token <kubernetes-token> --discovery-token-unsafe-skip-ca-verification
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    Notes:

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    • <master-ip> is the IP of master node.
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    • <kubernetes-token> is the token achieved by checking the master node.
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    6. \n
  6. \n

    If you want to uninstall Kubernetes, please execute the command in the root directories(both master and worker nodes):

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    chmod +x install.sh && ./install.sh down
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    7. \n
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