/etc/nbd-server/conf.d/debian-edu.conf is in debian-edu-config 1.818+deb8u2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | [swap]
exportname = /var/opt/ltsp/swapfiles/%s
prerun = nbdswapd %s
postrun = rm -f %s
authfile =
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