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Reene
Reene

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[K8s][Commands]

k8s

use following commands to simulate kubernate clusters

0. configure static ip address 

ip route | grep default
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Open the Netplan configuration file:

sudo nano /etc/netplan/01-netcfg.yaml
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Configure static IP: Add the following to the file:

network: version: 2 ethernets: ens33: #Replace with your network card name addresses: - 192.168.1.10/24 # Set a fixed IP address routes: - to: default via: 192.168.1.1 #Set the gateway address nameservers: addresses: - 8.8.8.8 - 8.8.4.4
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sudo netplan apply
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1. ssh 

sudo apt update sudo apt install openssh-server -y sudo systemctl enable ssh sudo systemctl start ssh sudo systemctl status ssh
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sudo vim /etc/fstab #/swapfile none swap sw 0 0 sudo reboot free -h
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2. Master

  • Disable Swap (if not disabled) 
sudo swapoff -a sudo sed -i '/swap/d' /etc/fstab
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  • Import the GPG public key of the Alibaba Cloud image

curl -fsSL https://mirrors.aliyun.com/kubernetes/apt/doc/apt-key.gpg | sudo gpg --dearmor -o /usr/share/keyrings/kubernetes-archive-keyring.gpg

sudo apt-get update

  • Check /etc/apt/sources.list.d/kubernetes.list configuration 
sudo rm -f /etc/apt/sources.list.d/kubernetes.list echo "deb [signed-by=/usr/share/keyrings/kubernetes-archive-keyring.gpg] https://mirrors.aliyun.com/kubernetes/apt/ kubernetes-xenial main" | sudo tee /etc/apt/sources.list.d/kubernetes.list
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  • Update and install Kubernetes 
sudo apt-get update sudo apt-get install -y kubelet kubeadm kubectl
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  • Confirm whether the installation is successful 
kubelet --version kubeadm version kubectl version --client
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  • Install docker before start k8s 
sudo apt install -y docker.io sudo systemctl start docker sudo systemctl enable docker
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  • Initialize the Kubernetes cluster. Run the following command to initialize the Kubernetes master node: 
sudo kubeadm init --pod-network-cidr=192.168.0.0/16 --ignore-preflight-errors=Port-6443,Port-10259,Port-10257,Port-10250
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  • Set up kubectl to access the cluster 
mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config echo "export KUBECONFIG=$HOME/.kube/config" >> ~/.bashrc source ~/.bashrc
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Test whether the connection is successful:

kubectl get nodes
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bash
If the master node status is displayed as Ready, it means that the initialization is successful.

  • Install network plugin (using Flannel) 
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
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  • Add a working node

After the master node is initialized, copy the generated command to worker node by using the following command in the master node to join the worker node to the cluster:

sudo kubeadm token create --print-join-command
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If need to deploy an application, can use kubectl apply or Helm deployment.

3. worker 

 sudo apt-get update && sudo apt-get install -y apt-transport-https ca-certificates curl software-properties-common curl -fsSL https://mirrors.aliyun.com/kubernetes/apt/doc/apt-key.gpg | sudo gpg --dearmor -o /usr/share/keyrings/kubernetes-archive-keyring.gpg echo "deb [signed-by=/usr/share/keyrings/kubernetes-archive-keyring.gpg] https://mirrors.aliyun.com/kubernetes/apt/ kubernetes-xenial main" | sudo tee /etc/apt/sources.list.d/kubernetes.list sudo apt-get update sudo apt-get install -y kubelet kubeadm kubectl sudo apt-get install -y docker.io sudo systemctl enable docker sudo systemctl start docker sudo systemctl enable kubelet
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on worker:
mkdir -p $HOME/.kube

go to the master:
sudo scp /etc/kubernetes/admin.conf <worker-username>@<worker-node-ip-address>:/home/<worker-username>/.kube/config

back to the worker:
sudo chown $(id -u):$(id -g) $HOME/.kube/config

check the status:
kubectl get nodes

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