Unoconv as a docker service
You can expand the set of supported fonts by adding the .ttf files to /usr/local/share/fonts. The recommended way
to do this is to:
- Do a docker volume mount, i.e.
--volume /data/fonts:/usr/local/share/fonts - Restart the listener service when the fonts directory changes to force a font cache reload
You can list the available fonts by running fc-list, so for example by doing:
docker run -it --rm unoconv fc-list
When this image launches, it starts runit with two services:
- monit
- unoconv (in listener mode)
The reason for this non-standard setup is that unoconv, or more specifically libreoffice, starts to spike at 100% CPU usage when it's fed the right kind of "broken" file (and these cases are not too uncommon). Since short-term spikes in CPU usage should still be allowed for converting large files, we need to monitor the resource consumption over time and only act upon it when the CPU usage remains high for a while. Hence, monit is keeping an eye on the unoconv listener.