Introduction to Dockerfile

What is a Dockerfile?

• A Dockerfile is a text document that describes how to customize a container.
• Automates the process of building Docker images (as opposed to manual setup).

Basic Syntax of a Dockerfile

• Writing a Dockerfile involves understanding some basic commands:

1. FROM

• The first line must specify the base image.
• Example: FROM ubuntu

2. ADD

• Used to add files to the container from the host system.
• Syntax: ADD <source> <destination>
• Example: ADD . /var/www/html
• . means take files from the current directory.

3. RUN

• Used to execute commands in the container during the build process.
• Example: RUN apt-get update && apt-get install -y apache2
• The -y option allows installation without prompts.

4. CMD

• Specifies commands that should run when the container starts.
• These commands run only if no arguments are provided during docker run.
• Example: `CMD