mirror of
https://github.com/Zeckmathederg/glfs.git
synced 2025-01-24 23:32:12 +08:00
502 lines
15 KiB
XML
502 lines
15 KiB
XML
<?xml version="1.0" encoding="ISO-8859-1"?>
|
|
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
|
|
"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
|
|
<!ENTITY % general-entities SYSTEM "../../general.ent">
|
|
%general-entities;
|
|
|
|
<!ENTITY ntp-download-http "https://www.eecis.udel.edu/~ntp/ntp_spool/ntp4/ntp-4.2/ntp-&ntp-version;.tar.gz">
|
|
<!ENTITY ntp-download-ftp " ">
|
|
<!ENTITY ntp-md5sum "e1e6b23d2fc75cced41801dbcd6c2561">
|
|
<!ENTITY ntp-size "6.7 MB">
|
|
<!ENTITY ntp-buildsize "108 MB (with tests)">
|
|
<!ENTITY ntp-time "0.4 SBU (Using parallelism=4; with tests)">
|
|
]>
|
|
|
|
<sect1 id="ntp" xreflabel="ntp-&ntp-version;">
|
|
<?dbhtml filename="ntp.html"?>
|
|
|
|
<sect1info>
|
|
<date>$Date$</date>
|
|
</sect1info>
|
|
|
|
<title>ntp-&ntp-version;</title>
|
|
|
|
<indexterm zone="ntp">
|
|
<primary sortas="a-ntp">ntp</primary>
|
|
</indexterm>
|
|
|
|
<sect2 role="package">
|
|
<title>Introduction to ntp</title>
|
|
|
|
<para>
|
|
The <application>ntp</application> package contains a client and server
|
|
to keep the time synchronized between various computers over
|
|
a network. This package is the official reference implementation of the
|
|
NTP protocol.
|
|
</para>
|
|
|
|
&lfs101_checked;
|
|
|
|
<bridgehead renderas="sect3">Package Information</bridgehead>
|
|
<itemizedlist spacing="compact">
|
|
<listitem>
|
|
<para>
|
|
Download (HTTP): <ulink url="&ntp-download-http;"/>
|
|
</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>
|
|
Download (FTP): <ulink url="&ntp-download-ftp;"/>
|
|
</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>
|
|
Download MD5 sum: &ntp-md5sum;
|
|
</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>
|
|
Download size: &ntp-size;
|
|
</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>
|
|
Estimated disk space required: &ntp-buildsize;
|
|
</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>
|
|
Estimated build time: &ntp-time;
|
|
</para>
|
|
</listitem>
|
|
</itemizedlist>
|
|
|
|
<bridgehead renderas="sect3">ntp Dependencies</bridgehead>
|
|
|
|
<bridgehead renderas="sect4">Required</bridgehead>
|
|
<para role="required">
|
|
<xref linkend="perl-io-socket-ssl"/>
|
|
</para>
|
|
|
|
<!-- Tested 4.2.8p11 with neither wget nor lynx on system: Not required.
|
|
<bridgehead renderas="sect4">Recommended</bridgehead>
|
|
<para role="recommended">
|
|
<xref role="runtime" linkend="wget"/> (runtime, for
|
|
<command>update-leap</command>)
|
|
<!- - The download code for update-leap uses the File::Fetch perl module,
|
|
which may use wget, or lynx, or some core perl modules, so maybe move
|
|
to optional - ->
|
|
</para>
|
|
-->
|
|
<bridgehead renderas="sect4">Optional</bridgehead>
|
|
<para role="optional">
|
|
<xref linkend="libcap-pam"/>,
|
|
<xref linkend="libevent"/>,
|
|
<ulink url="http://www.thrysoee.dk/editline/">libedit</ulink>, and
|
|
<ulink url="https://www.gnu.org/software/autogen/">libopts from AutoGen</ulink>
|
|
</para>
|
|
|
|
<para condition="html" role="usernotes">User Notes:
|
|
<ulink url="&blfs-wiki;/ntp"/></para>
|
|
|
|
</sect2>
|
|
|
|
<sect2 role="installation">
|
|
<title>Installation of ntp</title>
|
|
|
|
<para>
|
|
There should be a dedicated user and group to take control
|
|
of the <command>ntpd</command> daemon after it is
|
|
started. Issue the following commands as the
|
|
<systemitem class="username">root</systemitem> user:
|
|
</para>
|
|
|
|
<screen role="root"><userinput>groupadd -g 87 ntp &&
|
|
useradd -c "Network Time Protocol" -d /var/lib/ntp -u 87 \
|
|
-g ntp -s /bin/false ntp</userinput></screen>
|
|
|
|
<!-- At least one of the issues has been reported upstream. The next para
|
|
is valid for 4.8.2p10 -->
|
|
<para>
|
|
The <command>update-leap</command> command needs to be fixed in order
|
|
to run properly:
|
|
</para>
|
|
|
|
<screen><userinput>sed -e 's/"(\\S+)"/"?([^\\s"]+)"?/' \
|
|
-i scripts/update-leap/update-leap.in</userinput></screen>
|
|
|
|
<para>
|
|
Install <application>ntp</application> by running
|
|
the following commands:
|
|
</para>
|
|
|
|
<!--
|
|
Note: Check if -fcommon is still required on versions gtr 4.2.8p14
|
|
Its a "hack" for gcc-10
|
|
-->
|
|
<screen><userinput>./configure CFLAGS="${CFLAGS:--O2 -g} -fPIC -fcommon" \
|
|
--prefix=/usr \
|
|
--bindir=/usr/sbin \
|
|
--sysconfdir=/etc \
|
|
--enable-linuxcaps \
|
|
--with-lineeditlibs=readline \
|
|
--docdir=/usr/share/doc/ntp-&ntp-version; &&
|
|
make</userinput></screen>
|
|
|
|
<para>
|
|
To test the results, issue: <command>make check</command>.
|
|
</para>
|
|
|
|
<para>
|
|
Now, as the <systemitem class="username">root</systemitem> user:
|
|
</para>
|
|
|
|
<screen role="root"><userinput>make install &&
|
|
install -v -o ntp -g ntp -d /var/lib/ntp</userinput></screen>
|
|
|
|
</sect2>
|
|
|
|
<sect2 role="commands">
|
|
<title>Command Explanations</title>
|
|
|
|
<para>
|
|
<envar>CFLAGS="-O2 -g -fPIC"</envar>: This environment variable
|
|
is necessary to generate Position Independent Code needed for
|
|
use in the package libraries.
|
|
</para>
|
|
|
|
<para>
|
|
<parameter>--bindir=/usr/sbin</parameter>: This parameter places
|
|
the administrative programs in <filename
|
|
class="directory">/usr/sbin</filename>.
|
|
</para>
|
|
|
|
<para>
|
|
<parameter>--enable-linuxcaps</parameter>: ntpd is run as user
|
|
ntp, so use Linux capabilities for non-root clock control.
|
|
</para>
|
|
|
|
<para>
|
|
<parameter>--with-lineeditlibs=readline</parameter>: This switch
|
|
enables <application>Readline</application> support for
|
|
<command>ntpdc</command> and <command>ntpq</command> programs. If omitted,
|
|
<application>libedit</application> will be used if installed, otherwise no
|
|
readline capabilites will be compiled.
|
|
</para>
|
|
|
|
</sect2>
|
|
|
|
<sect2 role="configuration">
|
|
<title>Configuring ntp</title>
|
|
|
|
<sect3 id="ntp-config">
|
|
<title>Config Files</title>
|
|
|
|
<para>
|
|
<filename>/etc/ntp.conf</filename>
|
|
</para>
|
|
|
|
<indexterm zone="ntp ntp-config">
|
|
<primary sortas="e-etc-ntp.conf">/etc/ntp.conf</primary>
|
|
</indexterm>
|
|
|
|
</sect3>
|
|
|
|
<sect3>
|
|
<title>Configuration Information</title>
|
|
|
|
<para>
|
|
The following configuration file first defines various ntp
|
|
servers with open access from different continents. Second, it
|
|
creates a drift file where <command>ntpd</command> stores the
|
|
frequency offset and a pid file to store the
|
|
<command>ntpd</command> process ID. Third, it defines the location
|
|
for the leap-second definition file
|
|
<filename>/etc/ntp.leapseconds</filename>, that the
|
|
<command>update-leap</command> script checks and updates, when
|
|
necessary. This script can be run as a cron job and the
|
|
<application>ntp</application> developers recommend a frequency of
|
|
about three weeks for the updates. Since the documentation included
|
|
with the package is sparse, visit the ntp website at
|
|
<ulink url="http://www.ntp.org/"/> and
|
|
<ulink url="http://www.pool.ntp.org/"/> for more information.
|
|
</para>
|
|
|
|
<screen role="root"><userinput>cat > /etc/ntp.conf << "EOF"
|
|
<literal># Asia
|
|
server 0.asia.pool.ntp.org
|
|
|
|
# Australia
|
|
server 0.oceania.pool.ntp.org
|
|
|
|
# Europe
|
|
server 0.europe.pool.ntp.org
|
|
|
|
# North America
|
|
server 0.north-america.pool.ntp.org
|
|
|
|
# South America
|
|
server 2.south-america.pool.ntp.org
|
|
|
|
driftfile /var/lib/ntp/ntp.drift
|
|
pidfile /var/run/ntpd.pid
|
|
|
|
leapfile /var/lib/ntp/ntp.leapseconds</literal>
|
|
EOF</userinput></screen>
|
|
|
|
<para>
|
|
You may wish to add a <quote>Security session</quote>. For
|
|
explanations, see <ulink url=
|
|
"https://www.eecis.udel.edu/~mills/ntp/html/accopt.html#restrict"/>.
|
|
</para>
|
|
|
|
<screen role="root"><userinput>cat >> /etc/ntp.conf << "EOF"
|
|
<literal># Security session
|
|
restrict default limited kod nomodify notrap nopeer noquery
|
|
restrict -6 default limited kod nomodify notrap nopeer noquery
|
|
|
|
restrict 127.0.0.1
|
|
restrict ::1</literal>
|
|
EOF</userinput></screen>
|
|
|
|
</sect3>
|
|
|
|
<sect3 id="ntp-init">
|
|
<title>Synchronizing the Time</title>
|
|
|
|
<para>
|
|
There are two options. Option one is to run <command>ntpd</command>
|
|
continuously and allow it to synchronize the time in a gradual manner.
|
|
The other option is to run <command>ntpd</command> periodically (using
|
|
cron) and update the time each time <command>ntpd</command> is
|
|
scheduled.
|
|
</para>
|
|
|
|
<para>
|
|
If you choose Option one, then install the
|
|
<phrase revision="sysv"><filename>/etc/rc.d/init.d/ntp</filename>
|
|
init script</phrase>
|
|
<phrase revision="systemd"><filename>ntpd.service</filename>
|
|
unit</phrase>
|
|
included in the
|
|
<xref linkend="bootscripts" revision="sysv"/>
|
|
<xref linkend="systemd-units" revision="systemd"/> package.
|
|
</para>
|
|
|
|
<indexterm zone="ntp ntp-init" revision="sysv">
|
|
<primary sortas="f-ntp">ntp</primary>
|
|
</indexterm>
|
|
|
|
<indexterm zone="ntp ntp-init" revision="systemd">
|
|
<primary sortas="f-ntpd">ntpd.service</primary>
|
|
</indexterm>
|
|
|
|
<screen role="root"><userinput>make install-ntpd</userinput></screen>
|
|
|
|
<para>
|
|
If you prefer to run <command>ntpd</command> periodically, add the
|
|
following command to <systemitem class="username">root</systemitem>'s
|
|
<filename>crontab</filename>:
|
|
</para>
|
|
|
|
<screen><literal>ntpd -q</literal></screen>
|
|
|
|
<para revision="sysv">
|
|
Execute the following command if you would like to set the hardware
|
|
clock to the current system time at shutdown and reboot:
|
|
</para>
|
|
|
|
<screen role="root" revision="sysv"><userinput>ln -v -sf ../init.d/setclock /etc/rc.d/rc0.d/K46setclock &&
|
|
ln -v -sf ../init.d/setclock /etc/rc.d/rc6.d/K46setclock</userinput></screen>
|
|
|
|
<para revision="sysv">
|
|
The other way around is already set up by LFS.
|
|
</para>
|
|
|
|
</sect3>
|
|
|
|
</sect2>
|
|
|
|
<sect2 role="content">
|
|
<title>Contents</title>
|
|
|
|
<segmentedlist>
|
|
<segtitle>Installed Programs</segtitle>
|
|
<segtitle>Installed Libraries</segtitle>
|
|
<segtitle>Installed Directories</segtitle>
|
|
|
|
<seglistitem>
|
|
<seg>calc_tickadj, ntp-keygen, ntp-wait, ntpd, ntpdate, ntpdc, ntpq,
|
|
ntptime, ntptrace, sntp, tickadj and update-leap</seg>
|
|
<seg>None</seg>
|
|
<seg>/usr/share/ntp,
|
|
/usr/share/doc/ntp-4.2.8 and
|
|
/var/lib/ntp</seg>
|
|
</seglistitem>
|
|
</segmentedlist>
|
|
|
|
<variablelist>
|
|
<bridgehead renderas="sect3">Short Descriptions</bridgehead>
|
|
<?dbfo list-presentation="list"?>
|
|
<?dbhtml list-presentation="table"?>
|
|
|
|
<varlistentry id="calc_tickadj">
|
|
<term><command>calc_tickadj</command></term>
|
|
<listitem>
|
|
<para>
|
|
calculates optimal value for tick given ntp drift file
|
|
</para>
|
|
<indexterm zone="ntp calc_tickadj">
|
|
<primary sortas="b-calc_tickadj">calc_tickadj</primary>
|
|
</indexterm>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry id="ntp-keygen">
|
|
<term><command>ntp-keygen</command></term>
|
|
<listitem>
|
|
<para>
|
|
generates cryptographic data files used by the NTPv4 authentication
|
|
and identification schemes
|
|
</para>
|
|
<indexterm zone="ntp ntp-keygen">
|
|
<primary sortas="b-ntp-keygen">ntp-keygen</primary>
|
|
</indexterm>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry id="ntp-wait">
|
|
<term><command>ntp-wait</command></term>
|
|
<listitem>
|
|
<para>
|
|
is useful at boot time, to delay the boot sequence until
|
|
<command>ntpd</command> has set the time
|
|
</para>
|
|
<indexterm zone="ntp ntp-wait">
|
|
<primary sortas="b-ntp-wait">ntp-wait</primary>
|
|
</indexterm>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry id="ntpd">
|
|
<term><command>ntpd</command></term>
|
|
<listitem>
|
|
<para>
|
|
is a ntp daemon that runs in the background and keeps
|
|
the date and time synchronized based on response from configured
|
|
ntp servers. It also functions as a ntp server
|
|
</para>
|
|
<indexterm zone="ntp ntpd">
|
|
<primary sortas="b-ntpd">ntpd</primary>
|
|
</indexterm>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry id="ntpdate">
|
|
<term><command>ntpdate</command></term>
|
|
<listitem>
|
|
<para>
|
|
is a client program that sets the date and time based on
|
|
the response from an ntp server. This command is deprecated
|
|
</para>
|
|
<indexterm zone="ntp ntpdate">
|
|
<primary sortas="b-ntpdate">ntpdate</primary>
|
|
</indexterm>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry id="ntpdc">
|
|
<term><command>ntpdc</command></term>
|
|
<listitem>
|
|
<para>
|
|
is used to query the ntp daemon about its current state
|
|
and to request changes in that state
|
|
</para>
|
|
<indexterm zone="ntp ntpdc">
|
|
<primary sortas="b-ntpdc">ntpdc</primary>
|
|
</indexterm>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry id="ntpq">
|
|
<term><command>ntpq</command></term>
|
|
<listitem>
|
|
<para>
|
|
is a utility program used to monitor <command>ntpd</command>
|
|
operations and determine performance
|
|
</para>
|
|
<indexterm zone="ntp ntpq">
|
|
<primary sortas="b-ntpq">ntpq</primary>
|
|
</indexterm>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry id="ntptime">
|
|
<term><command>ntptime</command></term>
|
|
<listitem>
|
|
<para>
|
|
reads and displays time-related kernel variables
|
|
</para>
|
|
<indexterm zone="ntp ntptime">
|
|
<primary sortas="b-ntptime">ntptime</primary>
|
|
</indexterm>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry id="ntptrace">
|
|
<term><command>ntptrace</command></term>
|
|
<listitem>
|
|
<para>
|
|
traces a chain of ntp servers back to the primary source
|
|
</para>
|
|
<indexterm zone="ntp ntptrace">
|
|
<primary sortas="b-ntptrace">ntptrace</primary>
|
|
</indexterm>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry id="sntp">
|
|
<term><command>sntp</command></term>
|
|
<listitem>
|
|
<para>
|
|
is a Simple Network Time Protocol (SNTP) client
|
|
</para>
|
|
<indexterm zone="ntp sntp">
|
|
<primary sortas="b-sntp">sntp</primary>
|
|
</indexterm>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry id="tickadj">
|
|
<term><command>tickadj</command></term>
|
|
<listitem>
|
|
<para>
|
|
reads, and optionally modifies, several timekeeping-related
|
|
variables in older kernels that do not have support for precision
|
|
timekeeping
|
|
</para>
|
|
<indexterm zone="ntp tickadj">
|
|
<primary sortas="b-tickadj">tickadj</primary>
|
|
</indexterm>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry id="update-leap">
|
|
<term><command>update-leap</command></term>
|
|
<listitem>
|
|
<para>
|
|
is a script to verify and, if necessary, update the leap-second
|
|
definition file
|
|
</para>
|
|
<indexterm zone="ntp update-leap">
|
|
<primary sortas="b-update-leap">update-leap</primary>
|
|
</indexterm>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
</variablelist>
|
|
|
|
</sect2>
|
|
|
|
</sect1>
|