Module Checklist
Containers with
Docker
By Techworld with Nana
Video Overview
★ What is a Container?
★ Container vs Image
★ Docker (Container) vs Virtual Machine
★ Docker Architecture and its components
★ Main Docker Commands
★ Debug Commands
★ Demo Project: Overview
★ Demo Project: Developing with Docker
★ Demo Project: Docker Compose - Running multiple services
★ Demo Project: Dockerfile - Building our own Docker Image
★ Demo Project: Private Docker Repository - Pushing our Docker
Image into a private Registry on AWS
★ Demo Project: Deploying our containerized application
★ Docker Volumes - Persist data in Docker
★ Demo Project: Volumes - Configuring persistence for our
application
★ Docker & Nexus: Push/Pull to Nexus Repository
★ Docker & Nexus: Run Nexus as Docker container
Demo Infos
Git Project https://gitlab.com/nanuchi/developing-with-docker
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What is a Container?
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Container vs Image
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❏ Demo executed - run two different Versions of Postgres Docker Images
Useful Links:
● Postgres Docker Images: https://hub.docker.com/_/postgres
Docker vs Virtual Machine
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Docker components
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❏ Installed Docker on your local machine
Useful Links:
● Docker Installation Guides for different OS:
https://docs.docker.com/get-docker/
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Main Docker Commands
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❏ Pull Redis Docker Image (docker pull)
❏ List existing Docker Images (docker images)
❏ Run Container (docker run)
❏ Run Container in a detached mode (docker run -d)
❏ List running containers (docker ps)
❏ Start container (docker start)
❏ Stop container (docker stop)
❏ List all containers - running and stopped ones (docker ps -a)
❏ Bind port (docker run -p)
Useful Links:
● Redis Docker Images: https://hub.docker.com/_/redis
Debug Commands
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❏ See logs of container (docker logs)
❏ Get interactive terminal of running container for troubleshooting
(docker exec -it)
Demo Project: Overview
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Demo Project: Developing with Docker
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❏ Git cloned example git project or created new one
❏ Pulled mongodb image
❏ Pulled mongo-express image
❏ Created mongo-network
❏ Started mongodb container with all necessary parameters
❏ Started mongo-express container with all necessary parameters
❏ Created new database via Mongo Express UI
❏ Configured Nodejs application code to connect with database
Useful Links:
● MongoDB Docker Image: https://hub.docker.com/_/mongo
● Mongo Express Docker Image: https://hub.docker.com/_/mongo-express
● Demo project: https://gitlab.com/nanuchi/developing-with-docker
Demo Project: Docker Compose - Running multiple
services
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❏ Installed Docker Compose (should already be installed with Docker
Desktop)
❏ Created a docker-compose file to start mongodb and mongo-express
containers instead of using docker run
❏ Created new database
Useful Links:
● Docker Compose Installation Guides for different OS:
https://docs.docker.com/compose/install/
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Demo Project: Dockerfile - Building our own Docker
Image
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❏ Created Dockerfile for our Node application (the name of the file MUST
be Dockerfile!)
❏ Built Docker Image from our Dockerfile and tag it
❏ Started newly created Docker Image
Demo Project: Private Docker Repository - Pushing our
Docker Image into a private Registry on AWS
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❏ Created private Docker Registry on Amazon ECR
❏ Logged in to private registry (docker login)
❏ Tagged Docker Image
❏ Pushed Docker Image to AWS ECR repository
Useful Links:
● Amazon ECR Docker Registry: https://aws.amazon.com/ecr/
● Installing AWS Cli Linux:
https://docs.aws.amazon.com/cli/latest/userguide/install-cliv2-linux.html
● Installing AWS CLI on MacOS:
https://docs.aws.amazon.com/cli/latest/userguide/install-cliv2-macOS.html
● Installing AWS CLI on Windows:
https://docs.aws.amazon.com/cli/latest/userguide/install-cliv2-windows.html
● Configuring the AWS CLI:
https://docs.aws.amazon.com/cli/latest/userguide/cli-chap-configure.html
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Demo Project: Deploying our containerized application
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❏ Added our example application to Dockerfile
❏ Changed mongodb server url from localhost to mongodb service name
in Node Code
❏ Started docker containers with docker-compose
Docker Volumes - Persist data in Docker
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Demo Project: Volumes - Configuring persistence for our
application
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❏ Demo executed - defined a Named Volume in Docker Compose File
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Docker & Nexus
Push/Pull to Nexus Repository
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❏ Created a Docker Repository on Nexus
❏ Created a User Role for Docker Repository on Nexus
❏ Configured Repository Connector (port 8083)
❏ Configured Firewall Rule to open port 8083 on Droplet
❏ Configured Token Issuing on Nexus (Realm - activate Docker Bearer
Token Realm)
❏ Configured insecure registries for Nexus IP and Port in Docker Desktop
(Docker Engine Tab)
❏ Logged in to Nexus Docker Repo (docker login)
❏ Pushed Docker Image to Nexus Repo
❏ Fetched Docker Image from Nexus Repo
Run Nexus as Docker Container on DigitalOcean Droplet
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❏ Created a new Droplet
❏ Configured Firewall rule to open port 22 for SSHing
❏ Installed Docker on Droplet
❏ Created docker volume to persist Nexus data
❏ Ran Nexus as Docker container with necessary parameters
❏ Accessed Nexus in browser
Useful Links:
● Nexus Docker Image: https://hub.docker.com/r/sonatype/nexus3
More Resources…
Official Resources
● Best practices for writing Dockerfiles:
https://docs.docker.com/develop/develop-images/dockerfile_best-practices/
● Docker development best practices:
https://docs.docker.com/develop/dev-best-practices/
● Tips for Caching, reducing Image size, maintainability, reproducibility:
https://www.docker.com/blog/intro-guide-to-dockerfile-best-practices/
● Tip: Enforce Dockerfile best practices automatically by using a static code
analysis tool (e.g. https://github.com/hadolint/hadolint )
