Docker Combo Images

comboI’ve been working with Docker a lot for the past year and it’s pretty great. It especially shines when combined with Kubernetes. As the projects grew more and more complex, a common issue I kept encountering was running both Python and JavaScript code in the same container. Certain Django plugins require Node to run, Serverless requires both Python and Node, and sometimes you just need some Python tools on top of Node to build.

I usually ended up creating my own image containing both Python and Node with:

FROM python:3

RUN curl -sL https://deb.nodesource.com/setup_8.x | sudo -E bash -
RUN apt-get install -y nodejs

# ... rest of my stuff

There are two problems with this approach.

  1. It’s slow. Installing Node takes a while and doing it for every non-cached build is time consuming.
  2. You lose the Docker way of just pulling a nice prepared image. If Node changes their deployment method, the Dockerfile has to be updated. It’s much simpler to just docker pull node:8

The obvious solution is going to Docker Hub and looking for an image that already contains both. There are a bunch of those but they all look sketchy and very old. I don’t feel like I can trust them to have the latest security updates, or any updates at all. When a new version of Python comes out, I can’t trust those images to get new tags with the new version which means I’d have to go looking for a new image.

So I did what any sensible person would do. I created my own (obligatory link to XKCD #927 here). But instead of creating and pushing a one-off image, I used Travis.ci to update the images daily. This was actually a pretty fun exercise that allowed me to learn more about Docker Python API, Docker Hub and Travis.ci. I tried to make it as easily extensible as possible so anyone can submit a PR for a new combo like Node and Ruby, or Python or Ruby, or Python and Java, etc.

The end result allows you to use:

docker run --rm combos/python_node:3_6 python3 -c "print('hello world')"
docker run --rm combos/python_node:3_6 node -e "console.log('hello world')"

You can rest assured you will always get the latest version of Python 3 and the latest version of Node 6. The image is updated daily. And since the build process is completely transparent on Travis.ci you should be able to trust that there is no funny business in the image.

Images: https://hub.docker.com/r/combos/
Source code: https://github.com/kichik/docker-combo
Build server: https://travis-ci.org/kichik/docker-combo

Android LXR

An open source OS makes debugging applications so much easier. Instead of firing up IDA and going through opcodes, you can simply read the code and sometimes even find comments. However, searching through millions of lines of code can be a daunting task. Operation systems usually have a huge codebase and even the simple task of looking for one function can take a few good minutes. After reading that function, you usually want to search for functions it calls or functions that call it to better understand the flow. Those extra searches take time too. A good IDE would solve this issue but it requires downloading and indexing the massive source code first.

LXR was created for this exact reason. It allows hosting a fully indexed copy of the source code. It even makes it easy to publish an index of multiple versions of the source code. Want to compare a certain function between two versions of the Linux kernel? No problem. Want to know which functions use a certain function? Easy. LXR is awesome and fast.

Setting up LXR on your own, however, does take some time and effort. That is why I was happy to find AndroidXref.com while trying to hunt down a bug in one of my Android applications. It indexes both Android and patched Linux kernel sources for all major versions of Android. It is an invaluable resource every Android developer should know.

I originally had a question about this topic open on StackOverflow with AndroidXref as the accepted answer. It was recently deleted, probably because it didn’t have anything to do with C operator precedence. This is my AndroidXref.SEO++.