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https://gitlab.freedesktop.org/NetworkManager/NetworkManager
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df94cb2116
NetworkManager-wait-online is a constant source of confusion, as it seems to delay the boot (when it's often just the messenger or either a network problem, a NetworkManager misconfiguration or a misconfiguration of other systemd services). Try to clear that up with a manual page. https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/merge_requests/1130
190 lines
7.2 KiB
XML
190 lines
7.2 KiB
XML
<?xml version='1.0'?>
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<?xml-stylesheet type="text/xsl" href="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" [
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<!ENTITY % entities SYSTEM "common.ent" >
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%entities;
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]>
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<!--
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nm-online(1) manual page
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Copyright 2010 - 2016 Red Hat, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.1
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, no Front-Cover Texts, and no Back-Cover
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Texts. You may obtain a copy of the GNU Free Documentation License
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from the Free Software Foundation by visiting their Web site or by
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writing to:
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Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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-->
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<refentry id='nm-online'>
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<refentryinfo>
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<title>nm-online</title>
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<author>NetworkManager developers</author>
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</refentryinfo>
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<refmeta>
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<refentrytitle>nm-online</refentrytitle>
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<manvolnum>1</manvolnum>
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<refmiscinfo class="source">NetworkManager</refmiscinfo>
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<refmiscinfo class="manual">General Commands Manual</refmiscinfo>
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<refmiscinfo class="version">&NM_VERSION;</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>nm-online</refname>
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<refpurpose>ask NetworkManager whether the network is connected</refpurpose>
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</refnamediv>
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<refsynopsisdiv id='synopsis'>
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<cmdsynopsis>
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<command>nm-online</command>
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<arg choice="opt" rep="repeat"><replaceable>OPTIONS</replaceable></arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1 id='description'><title>Description</title>
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<para><command>nm-online</command> is a utility to find out whether we are
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online. It is done by asking NetworkManager about its status. When run,
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<command>nm-online</command> waits until NetworkManager reports an active
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connection, or specified timeout expires. On exit, the returned status code
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should be checked (see the return codes below).</para>
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<para>This tool is not very useful to call directly. It is however used by
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<literal>NetworkManager-wait-online.service</literal> with
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<literal>--wait-for-startup</literal> argument
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(see <link linkend='NetworkManager-wait-online.service'><citerefentry><refentrytitle>NetworkManager-wait-online.service</refentrytitle><manvolnum>8</manvolnum></citerefentry></link>).
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</para>
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<para>By default, connections have the <literal>ipv4.may-fail</literal> and
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<literal>ipv6.may-fail</literal> properties set to <literal>yes</literal>;
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this means that NetworkManager waits for one of the two address families to
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complete configuration before considering the connection activated. If you
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need a specific address family configured before
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<literal>network-online.target</literal> is reached, set the corresponding
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<literal>may-fail</literal> property to <literal>no</literal>.</para>
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</refsect1>
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<refsect1 id='options'><title>Options</title>
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<variablelist>
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<varlistentry>
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<term><group choice='plain'>
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<arg choice='plain'><option>-h</option></arg>
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<arg choice='plain'><option>--help</option></arg>
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</group></term>
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<listitem>
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<para>Print help information.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><group choice='plain'>
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<arg choice='plain'><option>-q</option></arg>
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<arg choice='plain'><option>--quiet</option></arg>
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</group></term>
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<listitem>
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<para>Don't print anything.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><group choice='plain'>
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<arg choice='plain'><option>-s</option></arg>
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<arg choice='plain'><option>--wait-for-startup</option></arg>
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</group></term>
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<listitem>
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<para>Wait for NetworkManager startup to complete, rather than waiting for
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network connectivity specifically. Startup is considered complete once
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NetworkManager has activated (or attempted to activate) every auto-activate
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connection which is available given the current network state. This corresponds
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to the moment when NetworkManager logs <literal>"startup complete"</literal>.
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This mode is generally only useful at boot time. After startup has completed,
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<command>nm-online -s</command> will just return immediately, regardless of the
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current network state.</para>
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<para>There are various ways to affect when startup complete is reached.
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For details see
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<link linkend='NetworkManager-wait-online.service'><citerefentry><refentrytitle>NetworkManager-wait-online.service</refentrytitle><manvolnum>8</manvolnum></citerefentry></link>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<group choice='plain'>
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<arg choice='plain'><option>-t</option></arg>
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<arg choice='plain'><option>--timeout</option></arg>
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</group>
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<arg choice='plain'><replaceable>seconds</replaceable></arg>
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</term>
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<listitem>
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<para>Time to wait for a connection, in seconds. If the option is not provided,
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the environment variable <literal>NM_ONLINE_TIMEOUT</literal> is honored.
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The default timeout is 30 seconds.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><group choice='plain'>
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<arg choice='plain'><option>-x</option></arg>
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<arg choice='plain'><option>--exit</option></arg>
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</group></term>
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<listitem>
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<para>Exit immediately if NetworkManager is not running or connecting.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 id='exit_status'><title>Exit Status</title>
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<para><command>nm-online</command> exits with status 0 if it succeeds, a value
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greater than 0 is returned if an error occurs.</para>
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<variablelist spacing='compact' termlength='3'>
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<varlistentry>
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<term><errorcode>0</errorcode></term>
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<listitem>
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<para>Success – already online or connection established within given timeout.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><errorcode>1</errorcode></term>
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<listitem>
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<para>Offline or not online within given timeout.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><errorcode>2</errorcode></term>
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<listitem>
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<para>Unknown or unspecified error.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 id='see_also'><title>See Also</title>
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<para><link linkend='nmcli'><citerefentry><refentrytitle>nmcli</refentrytitle><manvolnum>1</manvolnum></citerefentry></link>,
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<link linkend='NetworkManager'><citerefentry><refentrytitle>NetworkManager</refentrytitle><manvolnum>8</manvolnum></citerefentry></link>,
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<link linkend='NetworkManager-wait-online.service'><citerefentry><refentrytitle>NetworkManager-wait-online.service</refentrytitle><manvolnum>8</manvolnum></citerefentry></link>.
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</para>
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</refsect1>
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</refentry>
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