Docker Image¶
A Docker image is a read-only template used to create Docker containers. It bundles the application code, runtime, libraries, environment variables, and configuration files needed to run an application.
Images are built from a Dockerfile and are composed of stacked, immutable layers. Each instruction in the Dockerfile adds a new layer; unchanged layers are cached and reused to speed up builds.
Official PHP images are available on Docker Hub in several variants: cli, fpm, apache, and zts, each based on Debian or Alpine Linux.
See also Official PHP Docker images and Create a Docker image for PHP.
Related : Docker, Docker Container, PHP Docker Container, Container, Registry, Image
