Docker

Rui Grafino v.01

This is a summary and reference for docker and some of it's commands and information.

What is Docker / Container?

• It's an isolated Operating System environment much like a Virtual Machine in wich we can isolate resources and apps.
• Usually serves an ephemeral purpose and it's discarded after usage.
• Low usage of resources on your Operating System.
• Share kernel with the host, dont have the need for an hypervisor.

Why use Docker?

• Isolate a development environment and it's dependencies.
• Setup a lab platform with low resources.
• Ephemeral testing.

What is a Dockerfile?

• A set of instructions to build a docker image.
• A custom environment that fits our needs.

Best Practices

• Containers should be ephemeral
• Avoid installing unnecessary packages
• Each container should have only one purpose
• Minimise the number of layers
• Sort multi-line arguments

Hide legacy syntax

export DOCKER_HIDE_LEGACY_COMMANDS=true