1rpc.nfsd(8) System Manager's Manual rpc.nfsd(8)
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6 rpc.nfsd - NFS server process
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9 /usr/sbin/rpc.nfsd [options] nproc
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12 The rpc.nfsd program implements the user level part of the NFS service.
13 The main functionality is handled by the nfsd kernel module. The user
14 space program merely specifies what sort of sockets the kernel service
15 should listen on, what NFS versions it should support, and how many
16 kernel threads it should use.
17 The rpc.mountd server provides an ancillary service needed to satisfy
19 mount requests by NFS clients.
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22 -d or --debug
23 enable logging of debugging messages
24 -H or --host hostname
26 specify a particular hostname (or address) that NFS requests
27 will be accepted on. By default, rpc.nfsd will accept NFS
28 requests on all known network addresses. Note that lockd (which
29 performs file locking services for NFS) may still accept request
30 on all known network addresses. This may change in future
31 releases of the Linux Kernel. This option can be used multiple
32 time to listen to more than one interface.
33 -p or --port port
35 specify a different port to listen on for NFS requests. By
36 default, rpc.nfsd will listen on port 2049.
37 -r or --rdma
39 specify that NFS requests on the standard RDMA port ("nfsrdma",
40 port 20049) should be honored.
41 --rdma=port
43 Listen for RDMA requests on an alternate port - may be a number
44 or a name listed in /etc/services.
45 -N or --no-nfs-version vers
47 This option can be used to request that rpc.nfsd does not offer
48 certain versions of NFS. The current version of rpc.nfsd can
49 support major NFS versions 2,3,4 and the minor versions 4.0, 4.1
50 and 4.2.
51 -s or --syslog
53 By default, rpc.nfsd logs error messages (and debug messages, if
54 enabled) to stderr. This option makes rpc.nfsd log these mes‐
55 sages to syslog instead. Note that errors encountered during
56 option processing will still be logged to stderr regardless of
57 this option.
58 -T or --no-tcp
60 Disable rpc.nfsd from accepting TCP connections from clients.
61 -U or --no-udp
63 Disable rpc.nfsd from accepting UDP connections from clients.
64 -V or --nfs-version vers
66 This option can be used to request that rpc.nfsd offer certain
67 versions of NFS. The current version of rpc.nfsd can support
68 major NFS versions 2,3,4 and the minor versions 4.0, 4.1 and
69 4.2.
70 -L or --lease-time seconds
72 Set the lease-time used for NFSv4. This corresponds to how
73 often clients need to confirm their state with the server. Valid
74 range is from 10 to 3600 seconds.
75 -G or --grace-time seconds
77 Set the grace-time used for NFSv4 and NLM (for NFSv2 and NFSv3).
78 New file open requests (NFSv4) and new file locks (NLM) will not
79 be allowed until after this time has passed to allow clients to
80 recover state.
81 nproc specify the number of NFS server threads. By default, eight
83 threads are started. However, for optimum performance several
84 threads should be used. The actual figure depends on the number
85 of and the work load created by the NFS clients, but a useful
86 starting point is eight threads. Effects of modifying that num‐
87 ber can be checked using the nfsstat(8) program.
88 Note that if the NFS server is already running, then the options for
90 specifying host, port, and protocol will be ignored. The number of
91 processes given will be the only option considered, and the number of
92 active nfsd processes will be increased or decreased to match this num‐
93 ber. In particular rpc.nfsd 0 will stop all threads and thus close any
94 open connections.
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98 Many of the options that can be set on the command line can also be
99 controlled through values set in the [nfsd] section of the
100 /etc/nfs.conf configuration file. Values recognized include:
101 threads
103 The number of threads to start.
104 host A host name, or comma separated list of host names, that
106 rpc.nfsd will listen on. Use of the --host option replaces all
107 host names listed here.
108 grace-time
110 The grace time, for both NFSv4 and NLM, in seconds.
111 lease-time
113 The lease time for NFSv4, in seconds.
114 port Set the port for TCP/UDP to bind to.
116 rdma Set RDMA port. Use "rdma=nfsrdma" to enable standard port.
118 UDP Enable (with "on" or "yes" etc) or disable ("off", "no") UDP
120 support.
121 TCP Enable or disable TCP support.
123 vers2
125 vers3
127 vers4 Enable or disable a major NFS version. 3 and 4 are normally
129 enabled by default.
130 vers4.1
132 vers4.2
134 Setting these to "off" or similar will disable the selected
135 minor versions. Setting to "on" will enable them. The default
136 values are determined by the kernel, and usually minor versions
137 default to being enabled once the implementation is sufficiently
138 complete.
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142 If the program is built with TI-RPC support, it will enable any proto‐
143 col and address family combinations that are marked visible in the net‐
144 config database.
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148 rpc.mountd(8), exports(5), exportfs(8), nfs.conf(5), rpc.rquotad(8),
149 nfsstat(8), netconfig(5).
150
152 Olaf Kirch, Bill Hawes, H. J. Lu, G. Allan Morris III, and a host of
153 others.
154 20 Feb 2014 rpc.nfsd(8)