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NAME | SYNOPSIS | DESCRIPTION | CONFIGURATION FILES | EXAMPLES | FILES | SEE ALSO | AUTHORS | COLOPHON |
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RPC.IDMAPD(8) BSD System Manager's Manual RPC.IDMAPD(8)
rpc.idmapd — NFSv4 ID <-> Name Mapper
rpc.idmapd [-h] [-f] [-v] [-C] [-S] [-p path] [-c path]
rpc.idmapd is the NFSv4 ID <-> name mapping daemon. It provides func‐
tionality to the NFSv4 kernel client and server, to which it communi‐
cates via upcalls, by translating user and group IDs to names, and vice
versa.
The system derives the part of the string by performing a password or
group lookup. The lookup mechanism is configured in /etc/idmapd.conf
By default, the 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 sys‐
tem'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.
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.
rpc.idmapd -f -vvv
Runs rpc.idmapd printing all messages to console, and with a verbosity
level of 3.
/etc/idmapd.conf, /etc/nfs.conf
idmapd.conf(5), nfs.conf(5), nfsidmap(8)
The rpc.idmapd software has been developed by Marius Aamodt Eriksen
⟨marius@citi.umich.edu⟩.
This page is part of the nfs-utils (NFS utilities) project. Informa‐
tion about the project can be found at
http://linux-nfs.org/wiki/index.php/Main_Page. If you have a bug
report for this manual page, see
⟨http://linux-nfs.org/wiki/index.php/Main_Page⟩. This page was
obtained from the project's upstream Git repository
⟨http://git.linux-nfs.org/?p=steved/nfs-utils.git;a=summary⟩ on
2018-02-02. (At that time, the date of the most recent commit that was
found in the repository was 2018-01-17.) If you discover any rendering
problems in this HTML version of the page, or you believe there is a
better or more up-to-date source for the page, or you have corrections
or improvements to the information in this COLOPHON (which is not part
of the original manual page), send a mail to man-pages@man7.org
BSD February 3, 2003 BSD
Pages that refer to this page: nfs(5), nfs.conf(5)
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