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Crafatar

Crafatar serves Minecraft avatars based on the skin for use in external applications. Inspired by Gravatar (hence the name) and Minotar.

Image manipulation is done by lwip. 3D renders are created with node-canvas / cairo.

Contributions welcome!

There are usually a few open issues.
We welcome any opinions or advice in discussions as well as pull requests.
Issues tagged with show where we could especially need your help!

Examples

Usage / Documentation

Please visit the website for details.

Contact

• You can follow us on twitter
• Open an issue on GitHub

Installation

Docker

docker network create crafatar
docker run --net crafatar -d --name redis redis
docker run --net crafatar -v crafatar-images:/crafatar/images -e REDIS_URL=redis://redis -p 3000:3000 crafatar/crafatar

Manual

• Install nodejs 12 (LTS)
• Install redis-server
• Run npm install
  If that fails, it's likely because because of node-canvas dependencies. Follow this guide to install them.
• Run npm start

Crafatar is now available at http://0.0.0.0:3000.

Configration / Environment variables

See the config.js file.

Operational notes

inodes

Crafatar stores a lot of images on disk. For avatars, these are 8×8 px PNG images with an average file size of ~90 bytes. This can lead to issues on file systems such as ext4, which (by default) has a bytes-per-inode ratio of 16Kb. With thousands of files with an average file size below this ratio, you will run out of available inodes before running out of disk space. (Note that this will still be reported as ENOSPC: no space left on device).

Consider using a different file system, changing the inode ratio, or deleting files before the inode limit is reached.

disk space and memory usage

Eventually you will run out of disk space and/or redis will be out of memory. Make sure to delete image files and/or flush redis before this happens.

Tests

npm test

If you want to debug failing tests:

# show logs during tests
env VERBOSE_TEST=true npm test

It can be helpful to monitor redis commands to debug caching errors:

redis-cli monitor