1SYSTEMD-USERDBD.SERVICE(8)  systemd-userdbd.service SYSTEMD-USERDBD.SERVICE(8)
2
3
4

NAME

6       systemd-userdbd.service, systemd-userdbd - JSON User/Group Record Query
7       Multiplexer/NSS Compatibility
8

SYNOPSIS

10       systemd-userdbd.service
11
12       /usr/lib/systemd/systemd-userdbd
13

DESCRIPTION

15       systemd-userdbd is a system service that multiplexes user/group lookups
16       to all local services that provide JSON user/group record definitions
17       to the system. In addition it synthesizes JSON user/group records from
18       classic UNIX/glibc NSS user/group records in order to provide full
19       backwards compatibility.
20
21       Most of systemd-userdbd's functionality is accessible through the
22       userdbctl(1) command.
23
24       The user and group records this service provides access to follow the
25       JSON User Record[1] and JSON Group Record[2] definitions. This service
26       implements the User/Group Record Lookup API via Varlink[3], and
27       multiplexes access other services implementing this API, too. It is
28       thus both server and client of this API.
29
30       This service provides two distinct Varlink[4] services:
31       io.systemd.Multiplexer provides a single, unified API for querying JSON
32       user and group records. Internally it talks to all other user/group
33       record services running on the system in parallel and forwards any
34       information discovered. This simplifies clients substantially since
35       they need to talk to a single service only instead of all of them in
36       parallel.  io.systemd.NameServiceSwitch provides compatibility with
37       classic UNIX/glibc NSS user records, i.e. converts struct passwd and
38       struct group records as acquired with APIs such as getpwnam(1) to JSON
39       user/group records, thus hiding the differences between the services as
40       much as possible.
41

SEE ALSO

43       systemd(1), nss-systemd(8), userdbctl(1), systemd-homed.service(8)
44

NOTES

46        1. JSON User Record
47           https://systemd.io/USER_RECORD
48
49        2. JSON Group Record
50           https://systemd.io/GROUP_RECORD
51
52        3. User/Group Record Lookup API via Varlink
53           https://systemd.io/USER_GROUP_API
54
55        4. Varlink
56           https://varlink.org/
57
58
59
60systemd 248                                         SYSTEMD-USERDBD.SERVICE(8)
Impressum