phpman > man > rpc.idmapd(8)

RPC.IDMAPD(8)             BSD System Manager's Manual            RPC.IDMAPD(8)

NAME
     rpc.idmapd — NFSv4 ID <-> Name Mapper

SYNOPSIS
     rpc.idmapd [-h] [-f] [-v] [-C] [-S] [-p path] [-c path]

DESCRIPTION
     rpc.idmapd is the NFSv4 ID <-> name mapping daemon.  It provides functionality to the NFSv4
     kernel client and server, to which it communicates via upcalls, by translating user and group
     IDs to names, and vice versa.

     The system derives the user part of the string by performing a password or group lookup.  The
     lookup mechanism is configured in /etc/idmapd.conf

     By default, the domain part of the string is the system's DNS domain name.  It can also be
     specified in /etc/idmapd.conf if the system is multi-homed, or if the system's DNS domain name
     does not match the name of the system's Kerberos realm.

     When the domain is not specified in /etc/idmapd.conf the local DNS server will be queried for
     the _nfsv4idmapdomain text record. If the record exists that will be used as the domain. When
     the record does not exist, the domain part of the DNS domain will used.

     Note that on more recent kernels only the NFSv4 server uses rpc.idmapd.  The NFSv4 client in‐
     stead uses nfsidmap(8), and only falls back to rpc.idmapd if there was a problem running the
     nfsidmap(8) program.

     The options are as follows:

     -h           Display usage message.

     -v           Increases the verbosity level (can be specified multiple times).

     -f           Runs rpc.idmapd in the foreground and prints all output to the terminal.

     -p path      Specifies the location of the RPC pipefs to be path.  The default value is
                  "/var/lib/nfs/rpc_pipefs".

     -c path      Use configuration file path.  This option is deprecated.

     -C           Client-only: perform no idmapping for any NFS server, even if one is detected.

     -S           Server-only: perform no idmapping for any NFS client, even if one is detected.

CONFIGURATION FILES
     rpc.idmapd recognizes the following value from the [general] section of the /etc/nfs.conf con‐
     figuration file:

     pipefs-directory
                  Equivalent to -p.

     All other settings related to id mapping are found in the /etc/idmapd.conf configuration file.

EXAMPLES
     rpc.idmapd -f -vvv

     Runs rpc.idmapd printing all messages to console, and with a verbosity level of 3.

FILES
     /etc/idmapd.conf, /etc/nfs.conf

SEE ALSO
     idmapd.conf(5), nfs.conf(5), nfsidmap(8)

AUTHORS
     The rpc.idmapd software has been developed by Marius Aamodt Eriksen ⟨marius AT citi.edu⟩.

BSD                            February 3, 2003                            BSD