The mongod binary in releases was generated using staticx on the official Docker container of mongodb. I've included a runit service to start it.

Make sure you have git and wget installed. If not, you can do it with xbps-install -S git wget.

Run the following to install mongod with the service:

# or your own binary
wget https://github.com/uditkarode/void-mongod/releases/download/v5.0.3/mongod

chmod +x mongod
sudo mv mongod /usr/local/bin
cd /tmp
git clone --depth 1 https://github.com/uditkarode/void-mongod
cd void-mongod
sudo mv mongod.conf /etc/mongod.conf
sudo mv mongod /etc/sv
sudo ln -sv /etc/sv/mongod /var/service
sudo sv start mongod

If you see something like warning: mongod: unable to open supervise/ok: file does not exist, you can ignore it.

mongod is now running! It will also autostart on every system boot. The logs will be saved to /tmp/sv/log/mongod/current.

The config file is at /etc/mongod.conf. If you make any changes that involve logging/storing in new directories, make sure whatever directories you use exist on the filesystem. You can also add a line like mkdir -p $YOUR_CUSTOM_FOLDER in /etc/sv/mongod/run, just like and after the second line of that file just to be sure.

Note that mongod by default only accepts connections from localhost. If you want it to accept connections from anywhere, change the 127.0.0.1 in the configuration file to 0.0.0.0.