Docker Images
Understanding how application code and dependencies are packaged into immutable container images.
CONTAINERIZATION
Build once.
Run anywhere.
Learning how to package applications into portable, reproducible containers using Docker.
omkar@labs:~/docker
$ docker build -t omkarlabs .
[+] Building container image...
$ docker images
omkarlabs:latest
$ docker run -p 8080:8080 omkarlabs
● Container running on port 8080
$ _
DOCKER LAB
What I'm Learning
Building practical Docker knowledge through hands-on container projects.
Containers
Running isolated application environments using Docker containers.
Dockerfile
Creating reproducible container builds using Dockerfiles and layered images.
Docker Networking
Understanding ports, bridge networks, container communication and service connectivity.
Volumes
Learning how persistent application data can be stored outside the container lifecycle.
Container Registry
Publishing Docker images to registries such as Google Artifact Registry.
REAL-WORLD PROJECT
Containerizing Omkar Labs
The Omkar Labs website is being used as a practical Docker learning project.
PROJECT #001
Omkar Labs Docker Container
The static website is packaged into a Docker image and served using Nginx.
The same container can then be tested locally before being deployed to Google Cloud Run.
HTML
→
Nginx
→
Docker
→
Cloud Run
DOCKERFILE
Current Container Setup
A simple Nginx-based container suitable for the Omkar Labs static site.
Dockerfile
FROM nginx:alpine
COPY . /usr/share/nginx/html
EXPOSE 8080
CMD ["nginx", "-g", "daemon off;"]
CONTAINER WORKFLOW
Build → Test → Deploy
Build
Create a Docker image from the application source code and Dockerfile.
Run
Start the container locally and verify application behaviour.
Test
Check HTTP connectivity, ports, logs and application health.
Push
Push the container image to a container registry.
Deploy
Deploy the container to Google Cloud Run.
Monitor
Monitor logs, traffic, revisions and resource usage.
DOCKER CLI
Essential Commands
docker
$ docker --version
$ docker build -t omkarlabs .
$ docker images
$ docker run -p 8080:8080 omkarlabs
$ docker ps
$ docker logs CONTAINER_ID
$ docker stop CONTAINER_ID
$ docker rm CONTAINER_ID
● Docker Lab Ready
CONTAINER CONCEPTS
Docker vs Virtual Machines
DOCKER
Containers
Containers share the host operating system kernel and package only the application and its dependencies.
VM
Virtual Machines
Virtual machines include a complete guest operating system on top of virtualized hardware.
DOCKER ROADMAP
Next Labs
Phase 1 — Fundamentals
Images · Containers · Dockerfile · Ports · Logs · Volumes
Phase 2 — Advanced Docker
Docker Compose · Networks · Multi-stage builds · Image optimisation
Phase 3 — Cloud
Artifact Registry · Cloud Run · CI/CD · GitHub Actions · Kubernetes
KEEP BUILDING
Containers are the foundation.
Learn Docker today. Deploy to the cloud tomorrow.
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