Today was a heavy learning day! I dove deep into the Docker ecosystem. It wasn't just about running hello-world anymore; I focused on how to build, persist, and orchestrate containers.
Here is a log of what I accomplished today. 👇
🏗️ The Architecture
I started by breaking down the Docker Engine components. Understanding the relationship between the Docker Daemon, the Client, and the Registry made debugging much easier.
📝 My First Dockerfile
I wrote my first custom Dockerfile. It’s satisfying to see lines of code turn into a runnable image.
Used FROM to select a base image.
Used COPY to move my code inside.
Used CMD to tell the container what to do on startup.
💾 Networks & Volumes (Persistence!)
I learned that containers are ephemeral by default. To keep my data safe, I implemented Docker Volumes.
Volumes: Managed by Docker, great for database storage.
Networks: I created custom bridge networks so my containers could talk to each other by name, rather than IP address.
🐙 Docker Compose
This was the highlight. I learned that running containers manually is tedious. I wrote a docker-compose.yml file to define multiple services (app + db).
Command: docker-compose up -d
Result: The whole environment spun up instantly. No more manual linking!
☁️ Docker Hub
Finally, I practiced the "Distribution" part of Docker.
Created a repository on Docker Hub.
Tagged my local image: docker tag my-image my-username/my-repo:v1
Pushed it to the cloud.
Practiced pulling images from other users to understand how to leverage the community's work.
Takeaway: Docker Compose is a game-changer for local development environments!
What was the first image you ever built? Let me know in the comments! 🚀
Linkedin: https://www.linkedin.com/in/dasari-jayanth-b32ab9367/
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