How to use containerization technology to deploy applications on Linux
Introduction:
In today's Internet era, the speed of application development and deployment is the key to enterprise success. In order to speed up development and deployment, containerization technology emerged. Containerization technology can package an application and its dependencies into an independent, portable container so that it can run on any platform, reducing the complexity of environment configuration. In this article, we will introduce how to use containerization technology on Linux to deploy applications to quickly and efficiently meet the needs of enterprises.
1. What is containerization technology?
Containerization technology is a technology that independently encapsulates applications and their dependent resources. A container can run on a physical machine or a virtual machine like a virtual machine, but unlike a virtual machine, a container shares the operating system kernel with the host, so it is more lightweight and starts faster.
2. Docker: The most popular containerization platform
Docker is currently one of the most popular containerization platforms, with extensive support and a strong community ecosystem. Here are the steps on how to use Docker for application deployment on Linux:
sudo apt-get update sudo apt-get install docker-ce
# 使用基础镜像 FROM ubuntu:18.04 # 设置作者信息 MAINTAINER John Doe <john.doe@example.com> # 安装应用所需的依赖 RUN apt-get update && apt-get install -y python python-pip # 复制应用文件到镜像中 COPY app.py /app # 暴露应用运行的端口 EXPOSE 5000 # 设置启动时的默认命令 CMD ["python", "/app/app.py"]
docker build -t my-app .
docker run -d -p 5000:5000 my-app
In the above command, the -d parameter means in background mode To run the container, the -p parameter is used to specify the mapping relationship between the host port and the container port. my-app is the name of the Docker image used.
http://localhost:5000
through a browser to view the application interface. 3. Kubernetes: Distributed container management platform
Kubernetes is an open source platform for managing containerized applications. It can help us better manage and orchestrate containers, and provide high availability and elastic scaling capabilities. The following are the steps on how to use Kubernetes on Linux for application deployment:
kubectl version
kubectl create deployment my-app --image=my-app:latest
kubectl expose deployment my-app --port=80 --target-port=5000
kubectl get services
Visit http://<Service IP>:80
through the browser to view the application interface.
Conclusion:
Containerization technology brings great convenience to enterprise application development and deployment. This article introduces how to use Docker and Kubernetes for application deployment on Linux, and provides relevant code examples. We hope that readers can deploy applications more quickly and efficiently and improve productivity through the guidance of this article.
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