'\" t
.TH "NSS\-SYSTEMD" "8" "" "systemd 241" "nss-systemd"
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.SH "NAME"
nss-systemd, libnss_systemd.so.2 \- Provide UNIX user and group name resolution for dynamic users and groups\&.
.SH "SYNOPSIS"
.PP
libnss_systemd\&.so\&.2
.SH "DESCRIPTION"
.PP
\fBnss\-systemd\fR
is a plug\-in module for the GNU Name Service Switch (NSS) functionality of the GNU C Library (\fBglibc\fR), providing UNIX user and group name resolution for dynamic users and groups allocated through the
\fIDynamicUser=\fR
option in systemd unit files\&. See
\fBsystemd.exec\fR(5)
for details on this option\&.
.PP
This module also ensures that the root and nobody users and groups (i\&.e\&. the users/groups with the UIDs/GIDs 0 and 65534) remain resolvable at all times, even if they aren\*(Aqt listed in
/etc/passwd
or
/etc/group, or if these files are missing\&.
.PP
To activate the NSS module, add
"systemd"
to the lines starting with
"passwd:"
and
"group:"
in
/etc/nsswitch\&.conf\&.
.PP
It is recommended to place
"systemd"
after the
"files"
or
"compat"
entry of the
/etc/nsswitch\&.conf
lines so that
/etc/passwd
and
/etc/group
based mappings take precedence\&.
.SH "EXAMPLE"
.PP
Here is an example
/etc/nsswitch\&.conf
file that enables
\fBnss\-systemd\fR
correctly:
.sp
.if n \{\
.RS 4
.\}
.nf
passwd:         compat mymachines \fBsystemd\fR
group:          compat mymachines \fBsystemd\fR
shadow:         compat

hosts:          files mymachines resolve [!UNAVAIL=return] dns myhostname
networks:       files

protocols:      db files
services:       db files
ethers:         db files
rpc:            db files

netgroup:       nis
.fi
.if n \{\
.RE
.\}
.SH "SEE ALSO"
.PP
\fBsystemd\fR(1),
\fBsystemd.exec\fR(5),
\fBnss-resolve\fR(8),
\fBnss-myhostname\fR(8),
\fBnss-mymachines\fR(8),
\fBnsswitch.conf\fR(5),
\fBgetent\fR(1)