How to Create a Docker Image?

The following article describes How to Create a Docker Image.

Basically, you need to follow these basic steps.

1. Create a Dockerfile. A Dockerfile is a plain text file that contains instructions for building a Docker image.
2. Write the Dockerfile. The Dockerfile contains instructions for building the docker image. They contain details such as the base image to use, the commands to run, the files to copy, and the ports to expose.
3. Build the image: Once you have written the Dockerfile, you can build the image using the “docker build” command.
4. Tag the image: After the image is built, you can tag it using the “docker tag” command. This assigns a name and a version number to the image, making it easier to reference and share.
5. Push the image: Once the image is tagged, you can push it to a Docker registry using the “docker push” command. This makes the image available for others to use and deploy.

Here is an example Dockerfile for a simple Python web application:

FROM python:3.9-slim-buster

WORKDIR /app

COPY requirements.txt .

RUN pip install --no-cache-dir -r requirements.txt

COPY . .

CMD [ "python", "./app.py" ]

EXPOSE 80

This Dockerfile uses the official Python 3.9 slim image as the base image, installs the required dependencies, copies the application files, sets the command to run the application, and exposes port 80. In order to build the image, you can use the following command in the same directory as the Dockerfile.

docker build -t my-python-app:1.0 .

This command would read the Dockerfile and build the image, assigning the name “my-python-app” and version “1.0” to the image.

Further Reading

When should we prefer to React over PHP?

Examples of Array Functions in PHP

Exploring PHP Arrays: Tips and Tricks

Basic Programs in PHP

Registration Form Using PDO in PHP

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