How to quickly deploy containerized web applications on Linux?

How to quickly deploy containerized web applications on Linux?

With the development of cloud computing and containerization technology, more and more developers are beginning to use containers to deploy and manage their web applications. Containerization can provide better environment isolation and resource utilization, making application deployment more flexible and efficient. In this article, we will introduce how to use Docker to quickly deploy containerized web applications on Linux.

1. Install Docker

First, we need to install Docker on Linux. Docker is an open source containerization platform that helps us create and manage containers. On most Linux distributions, Docker can be installed through package management tools. Taking Ubuntu as an example, you can use the following command to install Docker:

sudo apt-get update
sudo apt-get install docker.io

After the installation is complete, we can run the following command To verify whether the installation is successful:

docker version

If the Docker version information is output, the installation is successful.

2. Build a Docker image

Before using Docker to deploy containerized web applications, we need to build a Docker image. A Docker image is an executable software package that contains all the dependencies and configuration required to run a container. Before building a Docker image, we need to write a Dockerfile file to describe the image building process.

The following is a simple Dockerfile example:

# 使用官方的Python镜像作为基础镜像
FROM python:3.7

# 将当前目录下的代码复制到镜像中的/app目录
COPY . /app

# 设置工作目录为/app
WORKDIR /app

# 安装应用所需的依赖
RUN pip install -r requirements.txt

# 设置容器启动时执行的命令
CMD [ "python", "app.py" ]

In the above example, we use the official Python image as the base image, and copy the code in the current directory to / in the image app directory. Then, we install the dependencies required for the application in the /app directory, and finally set the command to be executed when the container starts as python app.py.

After finishing writing the Dockerfile, we can use the following command to build a Docker image named myapp:

docker build -t myapp .

After the image is built, we can View the image list by running the following command:

docker images

3. Run the container

After building the Docker image, we can use the following command to run the container:

docker run -d -p 80:80 myapp

In the above command, the -d parameter indicates running the container in the background, and the -p parameter specifies the port mapping of the container. Here, port 80 of the container is mapped to port 80 of the host, so that we can access the web application through the browser.

After running the above command, we can use the following command to view the running container:

docker ps

4. Access the Web application

Through The browser accesses http://localhost to access the web application deployed in the Docker container. If all goes well, you should be able to see the homepage of the web application.

5. Manage Containers

In a running container, we can use the following command to manage the container:

• View container logs: docker logs
• Stop the container: docker stop
• Start the stopped container: docker start
• Restart the container: docker restart
• Delete container: docker rm

6. Summary

This article introduces how to use Docker to quickly deploy containerized web applications on Linux. With Docker, we can easily build, deploy and manage containerized applications. I hope this article will help you learn and use containerization technology.

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