How to use docker packaging image

The Docker image packaging guide includes: Writing Dockerfiles, defining image basics, packages, and commands. Use docker build to build the image. Use docker tags to tag the image, specifying a name and version. If necessary, use docker push to push the image to the registry.

Docker Packaging Mirror Guide

How to package Docker image?

The process of packaging Docker images includes the following steps:

1. Write Dockerfile

Dockerfile is a text file containing instructions to build images. It defines the basic image of the image, the software packages to be installed, and the commands to be executed.

2. Build a mirror

Use the docker build command to build the image. This command will read the Dockerfile and execute the instructions line by line to create an image containing the required files and software.

3. Label the mirror

After building the image, you can use the docker tag command to tag it. The tag specifies the name and version number of the image to reference and identify the image.

4. Push mirror

If you need to use the image elsewhere, you can use the docker push command to push it to the registry. The registry is a central repository for storing and managing images.

Step Example

Take an image containing a Python application as an example, its Dockerfile is as follows:

 <code>FROM python:3.8-slim WORKDIR /app COPY requirements.txt . RUN pip install --no-cache-dir -r requirements.txt COPY . . CMD ["python", "app.py"]</code>

Build the image:

 <code>docker build -t my-python-app .</code>

Tag:

 <code>docker tag my-python-app my-python-app:1.0</code>

Push mirror:

 <code>docker push my-python-app:1.0</code>

Follow these steps to create and package Docker images for different deployment scenarios.

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