What is in the docker folder

In recent years, Docker has become a very popular tool in the field of software development and DevOps. Docker can encapsulate applications, services and related dependencies into a portable container, making the development process more efficient and easier to manage. So, what exactly is a Docker folder? In this article, we will cover some basic knowledge about Docker folders.

Basic concept of Docker folder

The Docker folder is part of the Docker container and is usually used to store Dockerfile and related context files. A Dockerfile is a script file used to define and build a Docker container, while a context file is a collection of all files and directories required to define a Dockerfile.

Usually, in the Docker folder, the source code of the application, related dependencies and configuration files are stored. All these files will be built into the Docker container and executed when the container starts. In addition, Docker also provides some commonly used folder structures for better readability and maintainability.

Docker folder structure

Usually, the structure of the Docker folder is as follows:

.
├── Dockerfile
├── config/
├── src/
└── scripts/

The functions of each folder are as follows:

• Dockerfile: used to define the build instructions of the Docker container, including a series of images, dependencies, and running instructions.
• config/: Stores the configuration file of the application.
• src/: Stores application source code and other necessary files.
• scripts/: Stores scripts and commands that need to be executed when the Docker container is running.

The above structure is an example of a commonly used Docker folder structure. In practice, it can be modified and expanded as needed.

Use of Docker folder

Before building a Docker container, you need to define the Dockerfile and place the Dockerfile and related context files in the Docker folder. Next, use the docker build command to build the container. The example is as follows:

docker build -t myapp:v1 ./Dockerfile

Explain the above command:

• docker build: The command to build the Docker container.
• -t myapp:v1: Specify the name and version of the Docker container.
• ./Dockerfile: Specify the path where the Dockerfile is located.

Before building a Docker container, you need to define the image, dependencies, and running instructions in the Dockerfile. After the build is successful, use the docker run command to run the Docker container. The example is as follows:

docker run -d -p 8080:80 myapp:v1

Explain the above command:

• docker run: The command to run the Docker container.
• -d: Run the Docker container in background mode.
• -p 8080:80: Specify the port mapping of the Docker container, mapping the host's 8080 port to the container's port 80.
• myapp:v1: Specify the version of the Docker container to run.

Summary

In this article, we introduced some basic knowledge about Docker folders. The Docker folder is an important part of the Docker container, which stores Dockerfile and related context files. Docker containers can be easily built and managed by defining a Dockerfile and related context files. In order to better utilize Docker technology, it is very important for developers and DevOps engineers to understand the usage and structure of Docker folders.

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