The Docker Compose environment variable support goes beyond just ${VAR}. Useful when you want safer configurations without hardcoding values. `:-` → use a default value (optional configuration) `:?` → stop with an error message (required values like secrets) @docker.com

Check out my new blog on how to run Claude Code locally for free with Docker (@docker.com) Model Runner. dev.to/pradumnasara...

Tomorrow!

Two supply chain attacks. Same pattern. Trivy and KICS show how compromised credentials can turn trusted CI/CD pipelines into a delivery path for malicious artifacts. Docker shared an informative blog breaking down what actually happened: www.docker.com/blog/trivy-k... @docker.com

Are you running out of tokens in OpenCode or Claude Code? Check out my recent guides on running them locally. I wrote official Docker guides on using OpenCode & Claude Code with Docker Model Runner. OpenCode: docs.docker.com/guides/openc... Claude Code: docs.docker.com/guides/claud...

Use `stop_grace_period` to give your app time to shut down properly. When you stop a container, @Docker waits before force-killing it. This helps finish requests, save data, and avoid unexpected issues. @docker.com

Meet Pradumna Saraf. Docker Captain. Open source advocate. Community builder. In this spotlight, he shares his journey into containers and cloud-native, and what keeps him excited about the future of development. Read more: https://bit.ly/46WNUjF

Switching to a Docker Hardened Image (DHI) is a simple change. The Docker workflow remains the same, but the base image is built with fewer packages, reduced attack surface, and better security defaults. @docker.com

In Docker Compose, you can use `cache_from` in the `build` section to reuse layers from an existing image and speed up builds This is especially useful in CI environments where a local build cache doesn’t exist. @docker.com

Play with Docker is now deprecated and no longer available. If you’re looking for a simple browser-based Docker playground, you can use LabSpaces instead. It will spin up environments instantly and experiment with Docker without installing anything locally. @docker.com

In case you missed it, I wrote a new blog about Docker Compose profiles and how they let you enable or disable services based on what you actually need. Check it out: dev.to/pradumnasara...

If you are repeating the same config and environment variables across multiple Docker Compose files, use YAML anchors. You can define the config once and reuse it everywhere. This keeps your compose files cleaner, easier to update, and more maintainable. @docker.com

Check out my new blog on Docker Compose profiles and how they let you enable or disable services based on what you actually need: dev.to/pradumnasara... @docker.com

I'll write a short blog on Docker Compose profiles and publish it soon!

I'll write a short blog and publish it soon!

Being too rigid with tools can hold developers back from better solutions.

Did you know Docker Compose has profiles? You can keep heavy services like Prometheus and Grafana turned off by default, and only start them when you actually need monitoring. You can start them by running: docker compose --profile monitoring up @docker.com

Check out my new blog on container security using Docker Hardened Images. I explain what they are, why they matter, and how they help reduce security risks in containers with a simple demo. dev.to/pradumnasara... @docker.com

Huge respect to companies that maintain their SDKs along with up-to-date documentation. It’s not easy when APIs change frequently.

Tomorrow!

One of the biggest announcements from Docker (@docker.com) this year, at least for me: Docker Hardened Images (DHI) are now free for every developer. Making secure, minimal, production-ready images available to everyone changes how we think about container security.

In case you missed it, I recently wrote about how you can run LLMs with Docker Compose using Docker Model Runner to speed up your AI development. Check it out here: dev.to/pradumnasara...

Using the "-ft" flag with Docker logs helps you follow the logs and monitor the output of a running container in real-time. Otherwise, without the flag, you have to keep typing the log command to get output. "-f" is for follow, and "-t" is for timestamps. @docker.com

People used to fight over JavaScript frameworks. That still happens, just quieter. Now the fight is between LLM models, and it is a very expensive one.

Exciting news! I’m honoured to share that I am officially a Microsoft MVP in DevOps! 🎉 I didn’t see this coming. People inside and outside the program say the award is like the “Oscars of tech,” and I’m truly grateful to Microsoft (@microsoft.com) for recognising me. #mvpbuzz

Hacktoberfest is over, but spam PRs are not.

Thank you, @aerabi.com, for gifting a copy of your newly published book, Docker and Kubernetes Security, and for bringing it all the way from Germany to Istanbul. I will go through it soon. If you want to learn @docker.com and Kubernetes security, I highly recommend this book.

One of the unexpected things that happened at Docker Summit in Istanbul was that I won the Most Active Docker Captain award. It was a weird and happy moment because going from just passionately using Docker to actually winning an award from them feels like a full-circle moment. @docker.com

One of the unexpected things that happened at Docker Summit in Istanbul was that I won the Most Active Docker Captain award. It was a weird and happy moment because going from just passionately using Docker to actually winning an award from them feels like a full-circle moment. @docker.com

You can define multiple AI models in Docker Compose. For example, if your app uses an LLM for chat and an embedding model for semantic search, both can be declared together in one file. No need to run models separately and then use them in your compose app. @docker.com

Docker Captains Summit 2025 in Istanbul🇹🇷 was an incredible experience! Over 50 Captains from 20+ countries came together for amazing discussions, cultural exchanges, and ideas to make Docker even better. Huge thanks to the Docker DevRel team for organising everything so smoothly!

Bad logs blame. Good logs explain.

It feels nice to have your interview published on Docker’s official website. @docker.com

There was chaos everywhere after the outage. It clearly shows how dependent we are on a single company or service. The same is true for any industry.

I still see many Docker Compose files that include a version field. After Docker Compose V2, you no longer need to specify a version. Both formats are still valid, but if you include a version, you’ll see a small warning in the terminal when you run the compose command. @docker.com

Not only can you use Docker Compose to run multiple services, but you can also use it to build images and save time typing long build commands in the command line. @docker.com

This is how my website pradumnasaraf.dev looks now compared to back in 2021.

Got my first endorsement for Docker and Kubernetes Security! 🚀 Huge thanks to Docker Captain & open-source contributor Pradumna Saraf for the kind words. 🙏 @pradumnasaraf.dev 📘 Launching Oct 1st → DockerSecurity.io

When a developer copies example code from your docs, it should run without edits. Because every broken example breaks trust instantly.

In case you missed my recent blog, I show how we can now define LLM models alongside your Docker Compose stack. With a single command, you can spin up or tear down models and services on demand. dev.to/pradumnasara...

When you run docker compose up, we can decide whether to pull a fresh image or use the one already on your machine. That’s why we use pull_policy. Here’s what you can set: - always: Always pull from the registry, even if you already have it. @docker.com (1/3)

The Open Letter’s newsletter, Edition 4, is LIVE! open.substack.com/pub/pradumna...

Working on the 4th edition of The Open Letter. It’s been a while since I sent one out. There will be some exciting news. If you haven’t subscribed yet, now’s the time: newsletter.pradumnasaraf.dev

I’ve updated my Speaking repository with the video and slides from my WASM vs Docker talk at KubeCon India. Check it out here: github.com/Pradumnasara...

With Docker Compose, you can run AI models too. Just like defining services or volumes in compose.yml, you can define models. @docker.com auto-injects the model configs into our app, and with `docker compose up` or down, the model is created or removed on demand.

It’s mind-blowing that my DevOps repo has crossed 3000 stars. I’m super glad it’s helping folks in their DevOps journey! github.com/Pradumnasara...

Docker Compose has always been one of my favorite features, and now it has become even more powerful. Now in @docker.com Compose, you can define LLM models to run alongside your stack. With a single command, you can create or destroy models and services on demand. dev.to/pradumnasara...

Soon.

KubeCon India was amazing. As always, I love hitting the stage and speaking about the tools and tech I enjoy using and sharing. The most important thing for me was reconnecting with friends and having non-professional/no-fluff chats over food (especially dosa).

Good logs tell stories.