What do you need to know and be able to do for effective work with Docker in projects?

For effective work with Docker in projects, it is important to know:

• Basics of containerization: what containers, images are, and how they work.
• Writing Dockerfile to create your own images.
• Managing containers: starting, stopping, deleting.
• Working with Docker Compose for orchestrating multiple containers.
• Understanding Docker networks and volumes for organizing interaction and data storage.
• Optimizing images to reduce size and speed up build.

Example of a simple Dockerfile for a PHP application:

FROM php:8.1-apache
COPY src/ /var/www/html/
RUN docker-php-ext-install pdo pdo_mysql

This allows quick deployment of a PHP application in a container.