x SuSE Linux 13.1-RELEASE x
x SuSE Linux 13.1-RELEASEx
SYSTEMD-USERDBD.SERVICE(8) systemd-userdbd.service SYSTEMD-USERDBD.SERVICE(8)
NAME
systemd-userdbd.service, systemd-userdbd - JSON User/Group Record Query
Multiplexer/NSS Compatibility
SYNOPSIS
systemd-userdbd.service
/usr/lib/systemd/systemd-userdbd
DESCRIPTION
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. It may also pick up statically defined JSON
user/group records from drop-in files in /etc/userdb/, /run/userdb/,
/run/host/userdb/ and /usr/lib/userdb/.
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 Records[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 three 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.NameServiceSwitch 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. io.systemd.DropIn makes JSON user/group records from
the aforementioned drop-in directories available.
SEE ALSO
systemd(1), nss-systemd(8), userdbctl(1), systemd-homed.service(8)
NOTES
1. JSON User Records
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/
systemd 254 SYSTEMD-USERDBD.SERVICE(8)
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