source: BOOK/network/common/systemd-network.xml @ 4d44a2a

clfs-3.0.0-systemdsystemd
Last change on this file since 4d44a2a was 63f1942, checked in by Chris Staub <chris@…>, 9 years ago

Added text about timesyncd

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1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3  "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4  <!ENTITY % general-entities SYSTEM "../../general.ent">
5  %general-entities;
6]>
7
8<sect1 id="ch-systemd-network">
9  <?dbhtml filename="systemd-network.html"?>
10
11  <title>Networking Configuration with Systemd-networkd</title>
12
13  <sect2 role="interface-config">
14    <title>Network Interface Configuration</title>
15
16    <note><para>Udev may assign random Network Card Interface names
17    for some network cards such as enp2s1. If you are not sure what
18    your Network Card Interface name is, you can always run
19    <command>ip l</command> after you have booted your system. It is important
20    that the <envar>Name</envar> variable in
21    <filename>/etc/systemd/network</filename> contain the correct Network Card
22    Interface name (e.g. <envar>Name=enp2s1</envar> or
23    <envar>Name=eth0</envar>) or systemd will fail to bring
24    up your network interface.</para></note>
25
26    <sect3 role="static">
27      <title>Static Network Interface Configuration</title>
28
29      <para><command>systemd-networkd</command> uses
30      <filename>/etc/system/network</filename> for configuration files. Refer
31      to systemd.network(5) and systemd.netdev(5). Configure a network
32      interface with a config file. Adjust Name= as required:</para>
33
34  <screen><userinput>cd /etc/systemd/network &amp;&amp;
35cat &gt; static.network &lt;&lt; "EOF"
36[Match]
37Name=enp2s0
38
39[Network]
40Address=192.168.1.1/24
41Gateway=192.168.1.2
42EOF</userinput></screen>
43
44      <para os="var-ob">The values of these variables must be changed in every
45      file to match the proper setup.</para>
46
47      <para os="var-i">The <envar>Name</envar> variable defines the interface
48      name, for example, eth0. It is required for all network device
49      configuration files.</para>
50
51      <para>The <envar>Gateway</envar> variable should contain the default
52      gateway IP address, if one is present. If not, then comment out the
53      variable entirely.</para>
54
55      <para>For more information see the <command>systemd.netdev</command> man page.</para>
56
57    </sect3>
58
59    <sect3 role="dhcp">
60      <title>Connecting to a network with DHCP</title>
61
62    <para><command>systemd-networkd</command> uses
63    <filename>/etc/systemd/network</filename> for configuration files. Refer
64    to <filename>systemd.network(5)</filename> and
65    <filename>systemd.netdev(5)</filename>. Configure a network interface
66    with a config file. Adjust Name= as required:</para>
67
68<screen><userinput>cd /etc/systemd/network &amp;&amp;
69cat &gt; dhcp.network &lt;&lt; "EOF"
70[Match]
71Name=enp2s0
72
73[Network]
74DHCP=yes
75EOF</userinput></screen>
76
77    <para><command>systemd-networkd</command> will automatically configure
78    <filename>/run/systemd/network/resolv.conf</filename> when using DHCP.
79    If you did not manually create <filename>/etc/resolv.conf</filename>,
80    create a symlink:</para>
81
82<screen><userinput>ln -sv /run/systemd/network/resolv.conf /etc</userinput></screen>
83
84    </sect3>
85
86  </sect2>
87
88  <sect2 role="timesyncd">
89    <title>Using Timesyncd</title>
90
91    <para>Systemd includes a simple NTP client daemon,
92    <command>systemd-timesyncd</command>, though it is disabled by
93    default. If you want to enable it, you will first need to add a required
94    user and group:</para>
95
96<screen><userinput>groupadd -g &gid-systemd-timesync; systemd-timesync
97useradd -g systemd-timesync -u &uid-systemd-timesync; -d /dev/null -s /bin/false systemd-timesync</userinput></screen>
98
99    <para>Then, actually enable <command>systemd-timesyncd</command> so that
100    it will run on system boot:</para>
101
102<screen><userinput>systemctl enable systemd-timesyncd</userinput></screen>
103
104    <para>You can configure <command>systemd-timesyncd</command> by editing
105    <filename>/etc/systemd/timesyncd.conf</filename>.</para>
106
107  <para>Continue to <xref linkend="chapter-bootable"/>.</para>
108
109  </sect2>
110
111</sect1>
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