How to configure a container management platform (such as Kubernetes) on Linux

How to configure a container management platform (such as Kubernetes) on Linux

Introduction:
In today's cloud computing era, containerization technology has become a popular way to deploy and manage applications. Kubernetes is an open source container orchestration and management platform that simplifies the deployment, scaling and management of applications. This article will introduce how to configure Kubernetes on Linux, including detailed steps for installation and configuration, as well as some commonly used commands and examples.

1. Install Docker
Before configuring Kubernetes, we need to install Docker first, because Kubernetes uses Docker to run containers. The following is an example command to install Docker on an Ubuntu system:

sudo apt update
sudo apt install docker.io
sudo systemctl start docker
sudo systemctl enable docker

2. Install Kubernetes

1. Install the three components of kubelet, kubeadm and kubectl, which are used in the cluster. Run, initialize and manage Kubernetes on the nodes.

sudo apt update
sudo apt install -y kubelet kubeadm kubectl
sudo systemctl enable kubelet

2. Configure the network plug-in. Kubernetes requires network plug-ins to provide network interoperability for containers. Here we choose to use Calico as the network plug-in.

sudo kubectl apply -f https://docs.projectcalico.org/v3.8/manifests/calico.yaml

3. Initialize the Kubernetes Master node, use the kubeadm init command to initialize the Kubernetes Master node, and save the generated join command for subsequent node additions.

sudo kubeadm init --pod-network-cidr=192.168.0.0/16

4. Configure the Kubernetes Master node. Based on the output information of the init command, execute the following command to configure the Kubernetes Master node.

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

5. Deploy the network plug-in. Use the following command to deploy the network plug-in.

sudo kubectl apply -f https://docs.projectcalico.org/v3.8/manifests/calico.yaml

6. Join the Kubernetes node. According to the previously saved join command, execute the following command to add other nodes to the Kubernetes cluster.

sudo kubeadm join <master-ip>:<master-port> --token <token> --discovery-token-ca-cert-hash <hash>

3. Common commands and examples

1. To view cluster information, use the following commands to view Kubernetes cluster information.

kubectl cluster-info

2. To view node information, use the following command to view node information in the Kubernetes cluster.

kubectl get nodes

3. Deploying an application, use the following command to deploy an application.

kubectl run <app-name> --image=<image-name> --port=<port>

4. To view the status of the application, use the following command to view the status of the application.

kubectl get pods

5. Expand the application. Use the following command to expand the number of copies of an application.

kubectl scale deployment <deploy-name> --replicas=<replica-count>

Conclusion:
Through the above steps, we successfully configured the Kubernetes container management platform on Linux. Through Kubernetes, we can deploy, scale and manage applications more easily. However, be aware that when configuring Kubernetes, you need to carefully read the official documentation and follow the installation guide to ensure correct installation and configuration.

Reference link:

• Kubernetes official documentation: https://kubernetes.io/
• Calico official documentation: https://docs.projectcalico.org/ v3.8/getting-started/kubernetes/

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