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    Command Linux
    Home - man page - RPC.IDMAPD

    RPC.IDMAPD

    WillieBy WillieApril 9, 2026Updated:April 9, 2026No Comments2 Mins Read
     

    NAME

    rpc.idmapd – NFSv4 ID <-> Name Mapper  

    SYNOPSIS

    rpc.idmapd [-v ] [-f ] [-d domain ] [-p path ] [-U username ] [-G groupname ] [-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 options are as follows:

    -v
    Increases the verbosity level (can be specified multiple times).
    -f
    Runs rpc.idmapd in the foreground and prints all output to the terminal.
    -d domain
    Set domain to domain This is used internally by NFSv4 and is typically assigned by the system administrator. By default, domain is set to be the FQDN of the host, minus the hostname.
    -p path
    Specifies the location of the RPC pipefs to be path The default value is "/var/lib/nfs/rpc_pipefs".
    -U username
    Specifies the NFSv4 nobody user to be username The default value is "nobody".
    -G groupname
    Specifies the NFSv4 nobody group to be groupname The default value is "nobody".
    -c path
    Use configuration file path
    -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.

     

    EXAMPLES

    rpc.idmapd -d citi.umich.edu -f -vvv

    Runs rpc.idmapd with the domain "citi.umich.edu" in the foreground, printing all messages to console, and with a verbosity level of 3.  

    FILES

    /etc/idmapd.conf    

    AUTHORS

    The rpc.idmapd software has been developed by Marius Aamodt Eriksen Aq [email protected] .

    Willie
    • Website

    Willie has over 15 years of experience in Linux system administration and DevOps. After managing infrastructure for startups and enterprises alike, he founded Command Linux to share the practical knowledge he wished he had when starting out. He oversees content strategy and contributes guides on server management, automation, and security.

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