How to build a safe and reliable container orchestration platform on Linux?

How to build a safe and reliable container orchestration platform on Linux?

Introduction:
Container technology has been widely used and developed in recent years. Its emergence makes application deployment and upgrades more flexible and efficient. The container orchestration platform can further improve the automation and reliability of container management. This article will introduce how to build a safe and reliable container orchestration platform on Linux and provide relevant code examples.

1. Install Docker
   Docker is an open source container engine that can automatically package applications in containers for easy deployment and operation. Before building a container orchestration platform, you need to install Docker on Linux.

The command to install Docker on Ubuntu is as follows:

sudo apt update
sudo apt install docker.io

2. Install Kubernetes
   Kubernetes is an open source container orchestration platform that can be used to manage and schedule containers , providing high availability, elastic scaling and automated container deployment. Before building a container orchestration platform, Kubernetes needs to be installed.

The command to install Kubernetes on Ubuntu is as follows:

sudo apt update
sudo apt install kubeadm kubelet kubectl

3. Initialize the Kubernetes cluster
   Before building the container orchestration platform, you need to initialize the Kubernetes cluster. First, run the following command on the master node for initialization:

   sudo kubeadm init

   Then, according to the terminal output, save the generated token. Next, run the following command on the working node to join the cluster:

   sudo kubeadm join <master-ip>:<master-port> --token <token> --discovery-token-ca-cert-hash sha256:<hash>

   Where, <master-ip></master-ip> is the IP address of the master node, <master-port> is the port number of the master node, <code><token></token> and <hash></hash> are the token and hash generated when initializing the master node.

4. Install container network plug-in
   Next, we need to install a container network plug-in to achieve communication between containers. In this article, we choose to install the Calico network plug-in.

Run the following command on the master node to install:

kubectl create -f https://docs.projectcalico.org/v3.14/manifests/calico.yaml

5. Deploy container application
   Now, we have built a safe and reliable container orchestration platform. The container application is deployed. First, you need to write a YAML file that contains the container application configuration.

The sample YAML file is as follows:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-app
spec:
  replicas: 3
  selector:
    matchLabels:
      app: my-app
  template:
    metadata:
      labels:
        app: my-app
    spec:
      containers:
      - name: my-app-container
        image: my-app-image:latest
        ports:
        - containerPort: 80

Then, run the following command to deploy:

kubectl apply -f my-app.yaml

6. Monitoring and log management
   In container orchestration Monitoring and log management are very important parts of the platform. You can use Prometheus and Grafana for monitoring, and EFK (Elasticsearch Fluentd Kibana) for log management. A simple example is given here for reference:

Deploy Prometheus and Grafana:

kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/nginx-0.28.0/deploy/mandatory.yaml
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/nginx-0.28.0/deploy/provider/cloud-generic.yaml

Deploy EFK:

kubectl apply -f https://github.com/kubernetes/kubernetes/blob/master/cluster/addons/fluentd-elasticsearch/es-statefulset.yaml
kubectl apply -f https://github.com/kubernetes/kubernetes/blob/master/cluster/addons/fluentd-elasticsearch/es-service.yaml
kubectl apply -f https://github.com/kubernetes/kubernetes/blob/master/cluster/addons/fluentd-elasticsearch/fluentd-es-configmap.yaml
kubectl apply -f https://github.com/kubernetes/kubernetes/blob/master/cluster/addons/fluentd-elasticsearch/fluentd-es-ds.yaml
kubectl apply -f https://github.com/kubernetes/kubernetes/blob/master/cluster/addons/fluentd-elasticsearch/kibana-service.yaml

Conclusion:
This article explains how Build a safe and reliable container orchestration platform on Linux. By installing Docker and Kubernetes and using the Calico network plug-in, you can achieve high availability and elastic scaling of containers. In addition, by deploying Prometheus and Grafana for monitoring, and deploying EFK for log management, the reliability and security of container management can be improved. I hope this article will be helpful to everyone in building a container orchestration platform.

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