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NFSUSERD(8)             FreeBSD System Manager's Manual            NFSUSERD(8)

     nfsuserd - load user and group information into the kernel for NFSv4

     nfsuserd [-domain domain_name] [-usertimeout minutes]
              [-usermax max_cache_size] [-verbose] [-force] [num_servers]

     nfsuserd loads user and group information into the kernel for NFSv4.  It
     must be running for NFSv4 to function correctly, either client or server.

     Upon startup, it loads the machines DNS domain name, plus timeout and
     cache size limit into the kernel. It then preloads the cache with group
     and user information, up to the cache size limit and forks off N children
     (default 4), that service requests from the kernel for cache misses. The
     master server is there for the sole purpose of killing off the slaves.
     To stop the nfsuserd, send a SIGUSR1 to the master server.

     The following options are available:

     -domain domain_name
             This option allows you to override the default DNS domain name,
             which is acquired by taking either the suffix on the machine's
             hostname or, if that name is not a fully qualified host name, the
             canonical name as reported by getaddrinfo(3).

     -usertimeout minutes
             Overrides the default timeout for cache entries, in minutes. If
             the timeout is specified as 0, cache entries never time out. The
             longer the time out, the better the performance, but the longer
             it takes for replaced entries to be seen. If your user/group
             database management system almost never re-uses the same names or
             id numbers, a large timeout is recommended.  The default is 1

     -usermax max_cache_size
             Overrides the default upper bound on the cache size. The larger
             the cache, the more kernel memory is used, but the better the
             performance. If your system can afford the memory use, make this
             the sum of the number of entries in your group and password
             databases.  The default is 200 entries.

             When set, the server logs a bunch of information to syslog.

     -force  This flag option must be set to restart the daemon after it has
             gone away abnormally and refuses to start, because it thinks
             nfsuserd is already running.

             Specifies how many servers to create (max 20).  The default of 4
             may be sufficient. You should run enough servers, so that ps(1)
             shows almost no running time for one or two of the slaves after
             the system has been running for a long period. Running too few
             will have a major performance impact, whereas running too many
             will only tie up some resources, such as a process table entry
             and swap space.

     getpwent(3), getgrent(3), nfsv4(4), group(5), passwd(5), nfsd(8).

     The nfsuserd utility was introduced with the NFSv4 experimental subsystem
     in 2009.

     The nfsuserd use getgrent(3) and getpwent(3) library calls to resolve
     requests and will hang if the servers handling those requests fail and
     the library functions don't return. See group(5) and passwd(5) for more
     information on how the databases are accessed.

FreeBSD 11.0-PRERELEASE         April 25, 2009         FreeBSD 11.0-PRERELEASE


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