Manual Reference Pages - NFSUSERD (8)
- load user and group information into the kernel for
services plus support manage-gids for all NFS versions
loads user and group information into the kernel for NFSv4.
It must be running for NFSv4 to function correctly, either client or server.
It also provides support for manage-gids and must be running on the server if
this is being used for any version of NFS.
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:
This option allows you to override the default DNS domain name, which
is acquired by taking either the suffix on the machines hostname or,
if that name is not a fully qualified host name, the canonical name as
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 minute.
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.
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
This flag enables manage-gids for the NFS server
When this is enabled, all NFS requests using
AUTH_SYS authentication take the uid from the RPC request
and uses the group list for that uid provided by
on the server instead of the list of groups provided in the RPC authenticator.
This can be used to avoid the 16 group limit for AUTH_SYS.
Specifies how many servers to create (max 20).
The default of 4 may be sufficient. You should run enough servers, so that
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.
utility was introduced with the NFSv4 experimental subsystem in 2009.
library calls to resolve requests and will hang if the servers handling
those requests fail and the library functions dont return. See
for more information on how the databases are accessed.
Visit the GSP FreeBSD Man Page Interface.
Output converted with manServer 1.07.