RPC.IDMAPD(8)               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 instead 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 configuration 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@citi.umich.edu>.

Linux 6.7.4-arch1-1            February 3, 2003            Linux 6.7.4-arch1-1