Docker Basics for Web Development
When Docker helps in a project
Docker creates reproducible development environments for web projects. Instead of mixing Node, PHP, database, and other dependencies locally, the parts run in separate containers.
- an application runs correctly on one machine only
- local versions of Node, PHP, or databases drift apart
- new projects take too long until they can start
- the environment hides the actual cause of an error
Commands for the start
These commands cover the essentials for downloading or building an image, starting a container, checking existing containers, listing volumes and networks, and following logs.
Minimal Dockerfile
This example shows the basic principle of choosing a base image, setting a working directory, copying dependencies early, and starting the development command.
What becomes clearer through it
Images, containers, volumes, and logs make error sources in a project setup easier to see. Build, startup command, data storage, and runtime environment become easier to classify.