Ubuntu Manpage: rpc.nfsd - NFS server process

Provided by: nfs-kernel-server_1.3.4-2.5ubuntu3.6_amd64

NAME

       rpc.nfsd - NFS server process

SYNOPSIS

       /usr/sbin/rpc.nfsd [options] nproc

DESCRIPTION

       The  rpc.nfsd  program  implements  the  user  level  part  of  the  NFS service. The main
       functionality is handled by  the  nfsd  kernel  module.  The  user  space  program  merely
       specifies  what  sort of sockets the kernel service should listen on, what NFS versions it
       should support, and how many kernel threads it should use.

       The rpc.mountd server provides an ancillary service needed to satisfy  mount  requests  by
       NFS clients.

OPTIONS

-d or --debug
enable logging of debugging messages

-H or --host hostname
specify a particular hostname (or address) that NFS requests will be accepted on.
By default, rpc.nfsd will accept NFS requests on all known network addresses. Note
that lockd (which performs file locking services for NFS) may still accept request
on all known network addresses. This may change in future releases of the Linux
Kernel. This option can be used multiple time to listen to more than one interface.

-p or --port port
specify a different port to listen on for NFS requests. By default, rpc.nfsd will
listen on port 2049.

-r or --rdma
specify that NFS requests on the standard RDMA port ("nfsrdma", port 20049) should
be honored.

--rdma=port
Listen for RDMA requests on an alternate port - may be a number or a name listed in
/etc/services.

-N or --no-nfs-version vers
This option can be used to request that rpc.nfsd does not offer certain versions of
NFS. The current version of rpc.nfsd can support NFS versions 2,3,4 and the newer
version 4.1.

-s or --syslog
By default, rpc.nfsd logs error messages (and debug messages, if enabled) to
stderr. This option makes rpc.nfsd log these messages to syslog instead. Note that
errors encountered during option processing will still be logged to stderr
regardless of this option.

-T or --no-tcp
Disable rpc.nfsd from accepting TCP connections from clients.

-U or --no-udp
Disable rpc.nfsd from accepting UDP connections from clients.

-V or --nfs-version vers
This option can be used to request that rpc.nfsd offer certain versions of NFS. The
current version of rpc.nfsd can support NFS versions 2,3,4 and the newer version
4.1.

-L or --lease-time seconds
Set the lease-time used for NFSv4. This corresponds to how often clients need to
confirm their state with the server. Valid range is from 10 to 3600 seconds.

-G or --grace-time seconds
Set the grace-time used for NFSv4 and NLM (for NFSv2 and NFSv3). New file open
requests (NFSv4) and new file locks (NLM) will not be allowed until after this time
has passed to allow clients to recover state.

nproc specify the number of NFS server threads. By default, just one thread is started.
However, for optimum performance several threads should be used. The actual figure
depends on the number of and the work load created by the NFS clients, but a useful
starting point is 8 threads. Effects of modifying that number can be checked using
the nfsstat(8) program.

Note that if the NFS server is already running, then the options for specifying host,
port, and protocol will be ignored. The number of processes given will be the only option
considered, and the number of active nfsd processes will be increased or decreased to
match this number. In particular rpc.nfsd 0 will stop all threads and thus close any open
connections.

NOTES

       If the program is built with TI-RPC support, it  will  enable  any  protocol  and  address
       family combinations that are marked visible in the netconfig database.

AUTHOR