Cross Platform ARM w/ Docker and quemu

The goal is to automate building armhf (armv7) compatible Docker images. These images can be used for dev, build, test, and deploy to ensure a consistent user experience. The most common development, cloud, and build machines currently run x86-64 architecture hardware. This complicates working on software targeted at embedded arm platforms. With modern kernels that support binfmt misc and the right combination of qemu-XXX-static binary one can run arbitrary format Docker images on arbitrary host hardware. Continue reading

Cross Platform ODROID ARM Docker quemu

Overview In this post I document how to boot an ODROID ARM image from a x86 machine running qemu-system-arm from inside a Docker container. After this experience, I’m leaning towards a solution that uses binfmt_misc on the host and qemu-arm-static to run ARM docker images as opposed to emulating a whole specific system. Check out docker-arm-circleci UPDATE: I just put together an updated system based on the binfmt_misc solution. Check it out here: ubergarm/qemu Continue reading

Nginx Reverse Proxy

There’s more than one way to configure a server: some are complex, some simple, some static, and some dynamic. I’ve definitely become a fan of using nginx to reverse proxy Docker containers to a specified subdomain e.g. container.yourdomain.com. I spent a lot of time in the past tweaking nginx rewrite rules to give a dynamic feel while keeping the simplicity of a static config file. I recently discovered jwilder’s versitile docker-gen which listens on the Docker sock and updates config files based on the Go text/template language. Continue reading

Visualizing python dataframes in jupyter notebook with Altair

Finally, an easy way to turn Pandas DataFrames into sorted bar charts using brewer color schemes! It took a little playing around and it isn’t quite perfect yet, but here is a quick example of how to turn a Series or DataFrame into a lovely sorted stacked bar chart. References altair palettable jupyter notebook Run Jupyter Container Running as root allows you to !pip install or !apt-get install dependencies. Continue reading

Suckless Terminal

I want pretty colors and fonts in neovim suckless simple terminal st provides true color support out of the box and with argbbg patch to support transparent backgrounds through compton and scrollback it makes a fine replacement for rxvt-unicode (while there is a patch, it seems 256 colors out of the box may remain standard). Clone and Patch Clone mkdir suckless && cd suckless git clone http://git.suckless.org/st cd st Apply argbbg patch Continue reading