𝗗𝗼𝗰𝗸𝗲𝗿 𝗙𝗼𝗿 𝗕𝗲𝗴𝗶𝗻𝗻𝗲𝗿𝘀: 𝗔 𝗣𝗿𝗮𝗰𝘁𝗶𝗰𝗮𝗹 𝗚𝘂𝗶𝗱𝗲

𝗗𝗼𝗰𝗸𝗲𝗿 𝗙𝗼𝗿 𝗕𝗲𝗴𝗶𝗻𝗻𝗲𝗿𝘀: 𝗔 𝗣𝗿𝗮𝗰𝘁𝗶𝗰𝗮𝗹 𝗚𝘂𝗶𝗱𝗲

You build an app. It works on your laptop. You send it to a teammate. It breaks. You spend hours fixing version errors.

Docker stops this. It packages your app and its tools into one unit. This unit is a container. It runs the same on every machine.

Why use containers instead of virtual machines?

• Virtual machines run a full OS. They are slow.
• Containers share the host OS. They start in seconds.
• Containers use less memory.

Learn these four terms:

• Image: A read-only blueprint for your app.
• Container: A running instance of an image.
• Dockerfile: The recipe to build your image.
• Docker Compose: A tool to run multiple containers together.

Avoid these common mistakes:

• Using huge base images. Use slim versions.
• Forgetting .dockerignore. This makes images too big.
• Putting passwords in Dockerfiles. Use environment variables.
• Forgetting volumes. Your data vanishes when the container stops.

Docker makes onboarding fast. Your team runs one command to start the whole stack.

Source: https://dev.to/digitalunicon/docker-for-beginners-a-practical-guide-46le