systemd-userdbd(8) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | NOTES | COLOPHON

SYSTEMD-USERDBD.SERVICE(8) systemd-userdbd.serviceSYSTEMD-USERDBD.SERVICE(8)

NAME         top

       systemd-userdbd.service, systemd-userdbd - JSON User/Group Record
       Query Multiplexer/NSS Compatibility

SYNOPSIS         top

       systemd-userdbd.service

       /usr/lib/systemd/systemd-userdbd

DESCRIPTION         top

       systemd-userdbd is a system service that multiplexes user/group
       lookups to all local services that provide JSON user/group record
       definitions to the system. In addition it synthesizes JSON user/group
       records from classic UNIX/glibc NSS user/group records in order to
       provide full backwards compatibility.

       Most of systemd-userdbd's functionality is accessible through the
       userdbctl(1) command.

       The user and group records this service provides access to follow the
       JSON User Record[1] and JSON Group Record[2] definitions. This
       service implements the User/Group Record Lookup API via Varlink[3],
       and multiplexes access other services implementing this API, too. It
       is thus both server and client of this API.

       This service provides two distinct Varlink[4] services:
       io.systemd.Multiplexer provides a single, unified API for querying
       JSON user and group records. Internally it talks to all other
       user/group record services running on the system in parallel and
       forwards any information discovered. This simplifies clients
       substantially since they need to talk to a single service only
       instead of all of them in parallel.  io.systemd.NameSeviceSwitch
       provides compatibility with classic UNIX/glibc NSS user records, i.e.
       converts struct passwd and struct group records as acquired with APIs
       such as getpwnam(1) to JSON user/group records, thus hiding the
       differences between the services as much as possible.

SEE ALSO         top

       systemd(1), nss-systemd(8), userdbctl(1), systemd-homed.service(8)

NOTES         top

        1. JSON User Record
           https://systemd.io/USER_RECORD

        2. JSON Group Record
           https://systemd.io/GROUP_RECORD

        3. User/Group Record Lookup API via Varlink
           https://systemd.io/USER_GROUP_API

        4. Varlink
           https://varlink.org/

COLOPHON         top

       This page is part of the systemd (systemd system and service manager)
       project.  Information about the project can be found at 
       ⟨http://www.freedesktop.org/wiki/Software/systemd⟩.  If you have a bug
       report for this manual page, see
       ⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.  This
       page was obtained from the project's upstream Git repository
       ⟨https://github.com/systemd/systemd.git⟩ on 2020-09-18.  (At that
       time, the date of the most recent commit that was found in the repos‐
       itory was 2020-09-18.)  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

systemd 246                                       SYSTEMD-USERDBD.SERVICE(8)

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