Allow the administrator to force clients to use only the version 2 NFS protocol to mount file systems from this server.
Output debugging information.
Cause all succeeded mountd requests to be logged.
Allow non-root mount requests to be served. This should only be specified if there are clients such as PCs, that require it. It will automatically clear the vfs.nfsrv.nfs_privport sysctl flag, which controls if the kernel will accept NFS requests from reserved ports only.
Force mountd to bind to the specified port, for both AF_INET and AF_INET6 address families. This is typically done to ensure that the port which mountd binds to is a known quantity which can be used in firewall rulesets. If mountd cannot bind to this port, an appropriate error will be recorded in the system log, and the daemon will then exit.
Allow mount RPCs requests for regular files to be served. Although this seems to violate the mount protocol specification, some diskless workstations do mount requests for their swapfiles and expect them to be regular files. Since a regular file cannot be specified in /etc/exports, the entire file system in which the swapfiles resides will have to be exported with the -alldirs flag.
Specify an alternate location for the exports file.
When mountd is started, it loads the export host addresses and options into the kernel using the mount(2) system call. After changing the exports file, a hangup signal should be sent to the mountd daemon to get it to reload the export information. After sending the SIGHUP (kill -s HUP cat /var/run/mountd.pid), check the syslog output to see if mountd logged any parsing errors in the exports file.
If mountd detects that the running kernel does not include NFS support, it will attempt to load a loadable kernel module containing NFS code, using kldload(2). If this fails, or no NFS KLD was available, mountd exits with an error.