diff options
Diffstat (limited to 'man')
| -rw-r--r-- | man/nss-myhostname.xml | 5 | ||||
| -rw-r--r-- | man/nss-mymachines.xml | 5 | ||||
| -rw-r--r-- | man/nss-resolve.xml | 7 | ||||
| -rw-r--r-- | man/nss-systemd.xml | 107 | ||||
| -rw-r--r-- | man/systemd.exec.xml | 36 |
5 files changed, 149 insertions, 11 deletions
diff --git a/man/nss-myhostname.xml b/man/nss-myhostname.xml index a920ec334f..b1daaba02b 100644 --- a/man/nss-myhostname.xml +++ b/man/nss-myhostname.xml @@ -106,8 +106,8 @@ <para>Here is an example <filename>/etc/nsswitch.conf</filename> file that enables <command>nss-myhostname</command> correctly:</para> -<programlisting>passwd: compat mymachines -group: compat mymachines +<programlisting>passwd: compat mymachines systemd +group: compat mymachines systemd shadow: compat hosts: files mymachines resolve <command>myhostname</command> @@ -138,6 +138,7 @@ netgroup: nis</programlisting> <title>See Also</title> <para> <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, + <citerefentry><refentrytitle>nss-systemd</refentrytitle><manvolnum>8</manvolnum></citerefentry>, <citerefentry><refentrytitle>nss-resolve</refentrytitle><manvolnum>8</manvolnum></citerefentry>, <citerefentry><refentrytitle>nss-mymachines</refentrytitle><manvolnum>8</manvolnum></citerefentry>, <citerefentry project='man-pages'><refentrytitle>nsswitch.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>, diff --git a/man/nss-mymachines.xml b/man/nss-mymachines.xml index ec047449bf..a70119e256 100644 --- a/man/nss-mymachines.xml +++ b/man/nss-mymachines.xml @@ -82,8 +82,8 @@ <para>Here is an example <filename>/etc/nsswitch.conf</filename> file that enables <command>nss-mymachines</command> correctly:</para> - <programlisting>passwd: compat <command>mymachines</command> -group: compat <command>mymachines</command> + <programlisting>passwd: compat <command>mymachines</command> systemd +group: compat <command>mymachines</command> systemd shadow: compat hosts: files <command>mymachines</command> resolve myhostname @@ -103,6 +103,7 @@ netgroup: nis</programlisting> <para> <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, <citerefentry><refentrytitle>systemd-machined.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, + <citerefentry><refentrytitle>nss-systemd</refentrytitle><manvolnum>8</manvolnum></citerefentry>, <citerefentry><refentrytitle>nss-resolve</refentrytitle><manvolnum>8</manvolnum></citerefentry>, <citerefentry><refentrytitle>nss-myhostname</refentrytitle><manvolnum>8</manvolnum></citerefentry>, <citerefentry project='man-pages'><refentrytitle>nsswitch.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>, diff --git a/man/nss-resolve.xml b/man/nss-resolve.xml index d9e56453e8..e6cc1d982a 100644 --- a/man/nss-resolve.xml +++ b/man/nss-resolve.xml @@ -81,8 +81,8 @@ <para>Here is an example <filename>/etc/nsswitch.conf</filename> file that enables <command>nss-resolve</command> correctly:</para> -<programlisting>passwd: compat mymachines -group: compat mymachines +<programlisting>passwd: compat mymachines systemd +group: compat mymachines systemd shadow: compat hosts: files mymachines <command>resolve</command> myhostname @@ -102,8 +102,9 @@ netgroup: nis</programlisting> <para> <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, <citerefentry><refentrytitle>systemd-resolved</refentrytitle><manvolnum>8</manvolnum></citerefentry>, - <citerefentry><refentrytitle>nss-mymachines</refentrytitle><manvolnum>8</manvolnum></citerefentry>, + <citerefentry><refentrytitle>nss-systemd</refentrytitle><manvolnum>8</manvolnum></citerefentry>, <citerefentry><refentrytitle>nss-myhostname</refentrytitle><manvolnum>8</manvolnum></citerefentry>, + <citerefentry><refentrytitle>nss-mymachines</refentrytitle><manvolnum>8</manvolnum></citerefentry>, <citerefentry project='man-pages'><refentrytitle>nsswitch.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry> </para> </refsect1> diff --git a/man/nss-systemd.xml b/man/nss-systemd.xml new file mode 100644 index 0000000000..4228372e51 --- /dev/null +++ b/man/nss-systemd.xml @@ -0,0 +1,107 @@ +<?xml version='1.0'?> <!--*-nxml-*--> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" + "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> + +<!-- + This file is part of systemd. + + Copyright 2016 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +--> + +<refentry id="nss-systemd"> + + <refentryinfo> + <title>nss-systemd</title> + <productname>systemd</productname> + + <authorgroup> + <author> + <contrib>Developer</contrib> + <firstname>Lennart</firstname> + <surname>Poettering</surname> + <email>lennart@poettering.net</email> + </author> + </authorgroup> + </refentryinfo> + + <refmeta> + <refentrytitle>nss-systemd</refentrytitle> + <manvolnum>8</manvolnum> + </refmeta> + + <refnamediv> + <refname>nss-systemd</refname> + <refname>libnss_systemd.so.2</refname> + <refpurpose>Provide UNIX user and group name resolution for dynamic users and groups.</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <para><filename>libnss_systemd.so.2</filename></para> + </refsynopsisdiv> + + <refsect1> + <title>Description</title> + + <para><command>nss-systemd</command> is a plug-in module for the GNU Name Service Switch (NSS) functionality of the + GNU C Library (<command>glibc</command>), providing UNIX user and group name resolution for dynamic users and + groups allocated through the <varname>DynamicUser=</varname> option in systemd unit files. See + <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry> for details on + this option.</para> + + <para>To activate the NSS module, add <literal>systemd</literal> to the lines starting with + <literal>passwd:</literal> and <literal>group:</literal> in <filename>/etc/nsswitch.conf</filename>.</para> + + <para>It is recommended to place <literal>systemd</literal> after the <literal>files</literal> or + <literal>compat</literal> entry of the <filename>/etc/nsswitch.conf</filename> lines so that + <filename>/etc/passwd</filename> and <filename>/etc/group</filename> based mappings take precedence.</para> + </refsect1> + + <refsect1> + <title>Example</title> + + <para>Here is an example <filename>/etc/nsswitch.conf</filename> file that enables + <command>nss-systemd</command> correctly:</para> + + <programlisting>passwd: compat mymachines <command>systemd</command> +group: compat mymachines <command>systemd</command> +shadow: compat + +hosts: files mymachines resolve myhostname +networks: files + +protocols: db files +services: db files +ethers: db files +rpc: db files + +netgroup: nis</programlisting> + + </refsect1> + + <refsect1> + <title>See Also</title> + <para> + <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry><refentrytitle>nss-resolve</refentrytitle><manvolnum>8</manvolnum></citerefentry>, + <citerefentry><refentrytitle>nss-myhostname</refentrytitle><manvolnum>8</manvolnum></citerefentry>, + <citerefentry><refentrytitle>nss-mymachines</refentrytitle><manvolnum>8</manvolnum></citerefentry>, + <citerefentry project='man-pages'><refentrytitle>nsswitch.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry project='man-pages'><refentrytitle>getent</refentrytitle><manvolnum>1</manvolnum></citerefentry> + </para> + </refsect1> + +</refentry> diff --git a/man/systemd.exec.xml b/man/systemd.exec.xml index 41ae6e76de..58ba582911 100644 --- a/man/systemd.exec.xml +++ b/man/systemd.exec.xml @@ -143,10 +143,38 @@ <term><varname>User=</varname></term> <term><varname>Group=</varname></term> - <listitem><para>Sets the Unix user or group that the processes - are executed as, respectively. Takes a single user or group - name or ID as argument. If no group is set, the default group - of the user is chosen. These do not affect commands prefixed with <literal>+</literal>.</para></listitem> + <listitem><para>Set the UNIX user or group that the processes are executed as, respectively. Takes a single + user or group name, or numeric ID as argument. If no group is set, the default group of the user is used. This + setting does not affect commands whose command line is prefixed with <literal>+</literal>.</para></listitem> + </varlistentry> + + <varlistentry> + <term><varname>DynamicUser=</varname></term> + + <listitem><para>Takes a boolean parameter. If set, a UNIX user and group pair is allocated dynamically when the + unit is started, and released as soon as it is stopped. The user and group will not be added to + <filename>/etc/passwd</filename> or <filename>/etc/group</filename>, but are managed transiently during + runtime. The <citerefentry><refentrytitle>nss-systemd</refentrytitle><manvolnum>8</manvolnum></citerefentry> + glibc NSS module provides integration of these dynamic users/groups into the system's user and group + databases. The user and group name to use may be configured via <varname>User=</varname> and + <varname>Group=</varname> (see above). If these options are not used and dynamic user/group allocation is + enabled for a unit, the name of the dynamic user/group is implicitly derived from the unit name. If the unit + name without the type suffix qualifies as valid user name it is used directly, otherwise a name incorporating a + hash of it is used. If a statically allocated user or group of the configured name already exists, it is used + and no dynamic user/group is allocated. Dynamic users/groups are allocated from the UID/GID range + 61184…65519. It is recommended to avoid this range for regular system or login users. At any point in time + each UID/GID from this range is only assigned to zero or one dynamically allocated users/groups in + use. However, UID/GIDs are recycled after a unit is terminated. Care should be taken that any processes running + as part of a unit for which dynamic users/groups are enabled do not leave files or directories owned by these + users/groups around, as a different unit might get the same UID/GID assigned later on, and thus gain access to + these files or directories. If <varname>DynamicUser=</varname> is enabled, <varname>PrivateTmp=</varname> is + implied. This ensures that the lifetime of temporary files created by the executed processes is bound to the + runtime of the service, and hence the lifetime of the dynamic user/group. Since <filename>/tmp</filename> and + <filename>/var/tmp</filename> are usually the only world-writable directories on a system this ensures that a + unit making use of dynamic user/group allocation cannot leave files around after unit termination. Use + <varname>RuntimeDirectory=</varname> (see below) in order to assign a writable runtime directory to a service, + owned by the dynamic user/group and removed automatically when the unit is terminated. Defaults to + off.</para></listitem> </varlistentry> <varlistentry> |