Read through `/etc/idmapd.conf` to see if you need to make any changes
for your setup. I set `Domain = d.net` and `Local-Realms = R.EDU`.
You probably also want to look through `/etc/conf.d/nfs`. I added
-`-vvv` to `OPTS_RPC_GSSD` and `OPTS_RPC_SVCGSSD` to aid in debugging.
+`-vvv` to `OPTS_RPC_GSSD`, `OPTS_RPC_IDMAPD`, and `OPTS_RPC_SVCGSSD`
+to aid in debugging.
Setup your export filesystem. NFSv4 wants all its exports to live
under a single root, so do something like: