SYSTEMD-USERDBD.SERVICE(8) systemd-userdbd.service SYSTEMD-USERDBD.SERVICE(8) (NAME) systemd-userdbd.service, systemd-userdbd - (SYNOPSIS) systemd-userdbd.service /usr/lib/systemd/systemd-userdbd (DESCRIPTION) systemd-userdbd / / JSON () . / JSON / UNIX/glibc NSS . / JSON /etc/userdb/ /run/userdb/ /run/host/userdb/ /usr/lib/userdb/ ".user" ".group" . nss-systemd(8) . systemd-userdbd userdbctl(1) . JSON User Records[1] JSON Group Record[2] . User/Group Record Lookup API via Varlink[3] . () () . Varlink[4] : io.systemd.Multiplexer (API) JSON . / . . io.systemd.NameServiceSwitch UNIX/glibc NSS struct passwd struct group getpwnam(1) / JSON . io.systemd.DropIn / JSON (drop-in) . (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 261.2 SYSTEMD-USERDBD.SERVICE(8)