Docker Mastery

course links

• https://www.udemy.com/course/docker-mastery/
• Course repository: https://github.com/bretfisher/udemy-docker-mastery
• Discord community: https://discord.gg/AnP5pgM

contents

• Docker Installation - udemy
• Docker Basic Usage
• Running a shell inside containers
• Docker Mastery - Whats going on inside the containers
• Docker Networks
• Docker Container Images
• Dockerfile basics - Building Docker Images
• Docker Container Lifetime and Persistent Data
• Docker Compose

Troubleshooting problems with permissions in containers:
https://www.udemy.com/course/docker-mastery/learn/lecture/31063670#questions

Intro

The 3 docker innovations:

• docker image
• docker registry
• docker container

Major Linux features used by Docker:

• Namespaces
• cgroups
• veth
• iptables
• union mount

Why Docker? Why now?

3 reasons:

• isolation: better isolation in a single OS
• environments: reduced environment variances
• speed: increase speed of change

My goals

Besides the foundational knowledge needed to go on with kubernetes, I also want the docker knowledge to achieve these:

• use a docker-compose to make it simple to run the RetroAchievements website in a development environment.
• get the tools needed to deploy https://docs.retroachievements.org/.
• get the tools needed to deploy https://news.retroachievements.org/.
• create a network like the one illustrated in the first page of the book "TCP/IP Illustrated" (vol 1, 1st edition) by Richard Stevens.
• ambitious: get the tools needed to build RetroArch for Windows, Linux, Android, Raspberry Pi (ARM processors).

Random thoughts about Docker

Main concepts here:

• immutable and ephemeral infrastructure
• container images are just files/binaries used to run an application (kernel/drivers are provided by the host OS)
• UFS = Union File System
• each change in the file system creates a new layer
• container images are created in Dockerfiles
• to have persistent data we use volumes