Increase number of open files (systemd systems) (#39)
Increase number of open files (systemd systems) (#39)

This is a recommended setting starting with Nexus 3.5.0, but will likely not
be harmful in previous supported versions.

Documented in
https://help.sonatype.com/display/NXRM3/System+Requirements#filehandles

Should fix #27
criteo-cookbooks/nexus3,criteo-cookbooks/nexus3