Docker Training Bootcamp: A Practical Way of Learning-DevOps

Learn how to create and automate Docker images with a Dockerfile, detailing layers, layering, and the Docker build process using -f and -t flags, including centos7 as a base image.

Build a centos 7 image with a Dockerfile by layering base from centos, installing httpd and vsftpd, and adding files across successive images; tag, run, and verify packages.

Learn to label images with name, email, and address; set env variables with env; and run commands during image creation using Docker build.

Explore how the workdir parameter sets the container's landing directory to /tmp, affecting subsequent present working directory outputs and file locations across dockerfile steps and containers.

Learn how copy and add differ in dockerfiles: add extracts tar content, while copy copies files, with practical steps creating dirs, tarballs, and a user account with a password.

Create a dockerfile that adds a user via a variable name and password, switches to that user, and verifies access by inspecting /tmp inside a running container.

Learn to build a docker image by installing ftp and python during image creation. Configure CMD to launch the ftp or python prompt when the container starts.

Learn to ssh into a running docker container by building a CentOS image with OpenSSH, configuring sshd for password authentication, and connecting via ssh.

Learn how the expose command forwards a Docker host port to a container port, enabling ssh access on port 49153 mapped to container port 22.

Explore configuring a Docker container as an executable using entrypoint in a Dockerfile. Compare entrypoint with CMD and practice with ls and tree commands while building images and running containers.

Learn how to persist data in Docker by using volumes and bind mounts, overcoming the writable container layer and leveraging the host file system for reliable storage.

Learn how to persist data in Docker by creating and naming volumes for a MySQL container, mount volumes at /var/lib/mysql, and recreate containers without losing data.

Create a docker volume named oracle db, inspect its mount point, and attach it to a CentOS 8 container, mirroring host contents in the data oracle db path.

Learn how to delete unused docker volumes from the host, using docker volume prune, remove attached volumes with docker container rm, and remove volumes with docker volume rm.

Demonstrate bind mounts by mounting a host directory into a container using absolute host paths, contrasted with volumes, and practice with -v and --mount options.

Explore docker bridge networking with docker0 and veth, showing how containers reach the internet via the host and how -P maps container port 80 to a host port.

Learn to create a docker bridge network with subnet 172.18.0.0/16, attach containers to docker0 and docker1, and verify ping connectivity within the same bridge before cross-bridge communication in next lecture.

Map the nginx container port to the docker host to enable cross-bridge communication between containers on different networks, using -p hostPort:containerPort.

Learn how DNS works with a custom Docker bridge by creating two containers on a test bridge, then compare IP and hostname ping to reveal DNS resolution.

Master host networking in docker, where containers share the host network namespace and use the host IP, enabling port binding without NAT on Linux for performance.

Explore none networking in Docker to run containers with no IP address, isolated from external networks and other containers, featuring loopback only for batch jobs and secure testing.

Connect one or more networks to a running container with docker network connect, disconnect on the fly, and use bridge as the default network.

Create a private docker registry to host organization images. Deploy a registry container, manage volumes, and tag, push, and pull images from the local repository.

Practice private docker registry by tagging and pushing images from localhost, enabling insecure registries via daemon.json, and verifying the catalog at 127.0.0.1:5000/v2/_catalog.

Define your app environment with a Dockerfile, configure multi-container services in a docker-compose.yml, and start all services at once with docker compose up.

Learn how to install Docker Compose on Linux by running the download command, granting executable permission, creating the binary link, and testing the installation.

Learn to create a docker compose file in yml to deploy nginx webservers, map ports, and manage containers with docker-compose up, including multiple services and custom filenames.

Create docker compose files in json by converting from yml and deploying two containers with docker compose -f json up -d, then verify via docker container ls and browser access.

Learn basic Docker Compose commands and workflows: create and up, no-start, start, stop, rm, and down; observe that up creates networks and containers, while create is deprecated.

Learn basic docker compose commands to manage containers, view status and ports with docker compose ps and docker container ls, and pause or unpause containers to control state.

Learn basic docker compose commands, including ps, kill, and start, examine port mappings with docker-compose port, and contrast run vs exe while viewing logs with docker-compose logs.

Learn to run and scale two nginx web servers with docker compose, use the up command with the -f scale flag to scale, and inspect container processes with docker-compose top.

Learn to use docker compose to run an nginx web server, attach a host volume, and map port 5050 to 80 for seamless file sharing between host and container.

Build a custom nginx-based image with docker compose by creating a Dockerfile and docker-compose.yml, then run docker compose build and up -d with a volume that maps a host directory.

Reach the last lecture of this Docker training bootcamp, review what you learned, and ask questions via the course Q&A form or by messaging me for exam and career guidance.