Docker Essentials

Explore the stages of containerization with Docker, detailing dockerfiles as blueprints, docker images as shipped artifacts, and running containers, and introduce the Docker architecture for deeper understanding.

Explore the architecture of Docker, including the Docker client, host, and registry, and how the Docker daemon builds images from Dockerfiles and runs containers via CLI and APIs.

Explore Docker Hub, a cloud-based service to build, link, and manage docker images with automated builds. Explore popular repositories and the community, including nginx, from the dashboard.

Explore how to search for images on Docker Hub with filters and formats, list and pull images, and push tagged images to a repository, including tagging and login steps.

Learn how a container is a running instance of a Docker image, created via copy-on-write under Linux namespaces, with its own file system, network, storage driver, and resources.

Compare docker container create and run using busybox, with interactive -it and detached -d flags and --rm; observe container IDs and statuses via docker ps -a.

Learn to manage containers using docker commands: start, stop, restart with a 5-second delay, and rename cc-busybox containers, verify status with docker ps -a, and note the rm flag consequences.

Attach to a running container to access its standard I/O and view busybox with ls, then use docker exec -it to run commands like pwd without stopping the container.

Demonstrate port mapping by binding host port 8080 to container port 80 with -p TCP, show how -P maps ports via EXPOSE, and verify nginx on localhost:8080.

Learn to remove docker containers by listing them and using rm with names or IDs, force deleting running containers, or docker container kill, then prune stopped containers to free resources.

Explore how multi-container apps communicate using docker network drivers and the docker network command, with IPAM, from single-host setups to future swarm clusters.

Explore the container networking model, including docker network and ipam drivers, the docker engine creating network objects and endpoints, and how containers communicate via ip addresses and container names.

Create docker networks with a bridge driver, name them, assign subnet and ip range, and filter to view bridge networks alongside default ones.

Connect a running container to user-defined and default docker bridge networks, verify connections with docker inspect, observe endpoint IDs and IP addresses like 172.17.0.2, and disconnect as shown.

Explore how docker volumes, bind mounts, and tmpfs mounts provide persistent and secure storage for containers, and understand how read-only and read-write layers influence what to back up.

Create and attach vol-ubuntu to a ubuntu container cont-ubuntu, then apt-get update and verify the mount and host data in /var/lib/docker/volumes.

Learn how docker compose defines and runs multi-container applications from a single file, coordinating containers, networks, and services with one command, simplifying complex docker engine setups.

Install docker compose by fetching the binary from the official GitHub release, saving it to user/local/bin, making it executable, and verifying with docker-compose --version showing 1.22.0.

Run docker-compose up to launch wordpress and mysql, creating the default bridge network and wordpress_files and db_data volumes, with db starting before wordpress and 8000 mapped to 80.

Learn how Docker Swarm coordinates containers across multiple hosts with a manager–worker cluster, delivering services with replicas and tasks via orchestrator, dispatcher, scheduler, and executor.

Install docker-machine from the official Git repo to set up multiple hosts as swarm nodes, install it to /usr/local/bin, and verify the installation with docker-machine --version (version 0.14).

Create and manage swarm nodes using docker-machine with boot2docker on VirtualBox, launching a manager and workers, inspecting nodes, and connecting to the manager via ssh.

Initialize a docker swarm on the manager with docker swarm init and advertise its IP. Then join worker-1 and worker-2 to the swarm using docker swarm join and the token.

Verify swarm membership by listing nodes with docker node ls and inspecting each node with docker node inspect to view IDs, hostnames, status, platform, resources, and engine version 18.06.1 CE.

Drain a node in swarm for maintenance, transferring tasks to other nodes. Verify with Docker node ls and Docker service ps, then leave the swarm to remove the node.

Demonstrates scaling a swarm service from 3 to 6 replicas with docker service scale, updating to nginx:alpine, verifying with docker service inspect, and cleaning up by removing the service.

Master Docker GUI with Kitematic to manage Docker host and Docker Hub images, create and run containers, and edit volumes through an interactive interface.