Docker 101 - Complete Beginner Course

Explore how container images package an application, dependencies, runtime, and environment variables into a standard box, then ship to dev and prod to create consistent containers.

Compare virtual machines and containers to debunk the lightweight vm myth, and explain how hypervisors, host os, and container runtime enable os-level virtualization for isolated applications.

Explore container runtimes, OCI standards, and how high- and low-level runtimes work with cgroups and namespaces for isolation, with sandboxed and virtualized options like gvisor and kata containers.

Docker uses container D as the high level runtime to create diverse containers, invoking the low level runC and enabling gvisor sandbox, kata containers, and webassembly.

Explore docker architecture by seeing how a client communicates with the docker host and daemon to create containers, downloading images from the default registry when needed.

Learn to install the docker engine on linux with apt update and apt install, verify with systemctl, and view client, server details via docker version and docker info.

Learn hands-on container management with docker container run, image pulls from docker hub, listing, inspecting, and stopping containers. Explore isolation, temporary storage, and the difference between containers and images.

Pull images manually with Docker image pull, noting tags like latest and one hyphen pearl. List images with Docker image ls and identify complete image names as registry/repository:tag.

Inspect Docker images to view image ID, repo digest, and layer history, starting from a base image and adding changes with each new layer, as in nginx:latest.

Learn to turn a container’s temporary changes into a reusable image by committing the running state, building on top of a base image, and creating files for future containers.

Create automated docker images by writing dockerfiles, specifying a base image with from, copying project files, running setup commands, and setting a default command with CMD.

Log in to Docker Hub, tag images with your username, and push them to Docker Hub or private registries to share your Docker images.

Understand how docker networking uses a software bridge, with the bridge at 172.17.0.1, to connect containers to the host via virtual LAN cables for container and external communication.