Section: Maintenance Commands (8)
- NFSv4 ID <-> Name Mapper
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
part of the string by performing a password or group lookup.
The lookup mechanism is configured in
By default, the
part of the string is the system's DNS domain name.
It can also be specified in
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
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
Note that on more recent kernels only the NFSv4 server uses
The NFSv4 client instead uses
and only falls back to
if there was a problem running the
The options are as follows:
Display usage message.
Increases the verbosity level (can be specified multiple times).
in the foreground and prints all output to the terminal.
- -p path
Specifies the location of the RPC pipefs to be
The default value is "/var/lib/nfs/rpc_pipefs".
- -c path
Use configuration file
This option is deprecated.
Client-only: perform no idmapping for any NFS server, even if one is detected.
Server-only: perform no idmapping for any NFS client, even if one is detected.
recognizes the following value from the
section of the
All other settings related to id mapping are found in the
rpc.idmapd -f -vvv
messages to console, and with a verbosity level of 3.
software has been developed by Marius Aamodt Eriksen