261 lines
10 KiB
XML
261 lines
10 KiB
XML
<?xml version='1.0' encoding='utf-8'?>
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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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]>
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<!--
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Copyright 2018 Red Hat, Inc.
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<refentry>
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<refentryinfo>
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<title>httpd.conf</title>
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<productname>httpd</productname>
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<author><contrib>Author</contrib><surname>Orton</surname><firstname>Joe</firstname><email>jorton@redhat.com</email></author>
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</refentryinfo>
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<refmeta>
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<refentrytitle>httpd.conf</refentrytitle>
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<manvolnum>5</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>httpd.conf</refname>
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<refpurpose>Configuration files for httpd</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para>
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<filename>/etc/httpd/conf/httpd.conf</filename>,
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<filename>/etc/httpd/conf.modules.d</filename>,
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<filename>/etc/httpd/conf.d</filename>
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</para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>The <command>httpd</command> daemon uses a main
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configuration file at
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<filename>/etc/httpd/conf/httpd.conf</filename>. The syntax of
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this file is described at <ulink
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url="https://httpd.apache.org/docs/2.4/configuring.html"/>, and
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the full set of available directives at <ulink
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url="https://httpd.apache.org/docs/2.4/mod/directives.html"/>.
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</para>
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<refsect2>
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<title>Configuration structure</title>
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<para>The main configuration file
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(<filename>httpd.conf</filename>) sets up various defaults and
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includes configuration files from two directories -
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<filename>/etc/httpd/conf.modules.d</filename> and
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<filename>/etc/httpd/conf.d</filename>. Packages containing
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loadable modules (like <option>mod_ssl.so</option>) place files
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in the <filename>conf.modules.d</filename> directory with the
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appropriate <option>LoadModule</option> directive so that module
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is loaded by default.</para>
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<para>Some notable configured defaults are:.</para>
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<variablelist>
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<varlistentry>
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<term><option>DocumentRoot @DOCROOT@/html</option></term>
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<listitem><para>The default document root from which content
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is served.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>Listen 80</option></term>
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<listitem><para>The daemon lists on TCP port 80.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>ErrorLog "logs/error_log"</option></term>
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<listitem><para>Error messages are logged to
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<filename>@LOGDIR@/error_log</filename>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>ScriptAlias /cgi-bin/ "@DOCROOT@/cgi-bin/"</option></term>
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<listitem><para>CGI scripts are served via the URL-path <option>/cgi-bin/</option>.</para></listitem>
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</varlistentry>
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</variablelist>
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<para>To remove any of the default configuration provided in
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separate files covered below, replace that file with an empty
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file rather than removing it from the filesystem, otherwise it
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may be restored to the original when the package which provides
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it is upgraded.</para>
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</refsect2>
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<refsect2>
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<title>MPM configuration</title>
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<para>The configuration file at
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<filename>/etc/httpd/conf.modules.d/00-mpm.conf</filename> is
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used to select the multi-processing module (MPM), which governs
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how <command>httpd</command> divides work between processes
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and/or threads at run-time. Exactly one
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<option>LoadModule</option> directive must be uncommented in
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this file; by default the <option>@MPM@</option> MPM is enabled.
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For more information on MPMs, see <ulink
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url="https://httpd.apache.org/docs/2.4/mpm.html"/>.</para>
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<para>If using the <emphasis>prefork</emphasis> MPM, the
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"httpd_graceful_shutdown" SELinux boolean should also be
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enabled, since with this MPM, httpd needs to establish TCP
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connections to local ports to successfully complete a graceful
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restart or shutdown. This boolean can be enabled by running the
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command: <command>semanage boolean -m --on
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httpd_graceful_shutdown</command></para>
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</refsect2>
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<refsect2>
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<title>Module configuration files</title>
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<para>Module configuration files are provided in the
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<filename>/etc/httpd/conf.modules.d/</filename> directory, with
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names which are by convention prefixed with two digit numeric
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prefix to ensure they are processed in the desired order. Core
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modules provide with the <command>httpd</command> package are
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loaded by files with a <option>0x-</option> prefix to ensure
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these are loaded first. Only filenames with a
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<option>.conf</option> suffix in this directory will be
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processed.</para>
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<para>Other provided configuration files are listed below.
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<variablelist>
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<varlistentry>
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<term><filename>/etc/httpd/conf.modules.d/00-base.conf</filename></term>
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<listitem><para>The set of core modules included with
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<command>httpd</command> which are all loaded by
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default.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><filename>/etc/httpd/conf.modules.d/00-optional.conf</filename></term>
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<listitem><para>The set of non-core modules included with
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<command>httpd</command> which are <emphasis>not</emphasis>
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loaded by default.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><filename>/etc/httpd/conf.modules.d/00-systemd.conf</filename></term>
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<listitem><para>This file loads <option>mod_systemd</option>
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which is necessary for the correct operation of the
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<command>httpd.service</command> service, and should not be
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removed or disabled.</para></listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect2>
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<refsect2>
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<title>Other configuration files</title>
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<para>Default module configuration files and site-specific
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configuration files are loaded from the
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<filename>/etc/httpd/conf.d/</filename> directory. Only files
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with a <option>.conf</option> suffix will be loaded. The
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following files are provided:
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<variablelist>
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<varlistentry>
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<term><filename>/etc/httpd/conf.d/userdir.conf</filename></term>
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<listitem><para>This file gives an example configuration for
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<option>mod_userdir</option> to map URLs such as
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<option>http://localhost/~jim/</option> to
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<filename>/home/jim/public_html/</filename>. Userdir mapping
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is disabled by default.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><filename>/etc/httpd/conf.d/autoindex.conf</filename></term>
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<listitem><para>This file provides the default configuration
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for <option>mod_autoindex</option> which generates HTML
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directory listings when enabled. It also makes file icon
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image files available at the <option>/icons/</option>
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URL-path.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><filename>/etc/httpd/conf.d/welcome.conf</filename></term>
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<listitem><para>This file enables a "welcome page" at
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<option>http://localhost/</option> if no content is present
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in the default documentation root
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<filename>/var/www/html</filename>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><filename>/etc/httpd/conf.d/ssl.conf</filename> (present only if <option>mod_ssl</option> is installed)</term>
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<listitem><para>This file configures a TLS
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<option>VirtualHost</option> listening on port
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<option>443</option>. If the default configuration is used,
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the referenced test certificate and private key are
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generated the first time <command>httpd.service</command> is
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started; see
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<citerefentry><refentrytitle>httpd-init.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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for more information.</para></listitem>
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</varlistentry>
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</variablelist></para>
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</refsect2>
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<refsect2>
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<title>Instantiated services</title>
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<para>As an alternative to (or in addition to) the
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<command>httpd.service</command> unit, the instatiated template
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service <command>httpd@.service</command> unit file can be used,
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which starts <command>httpd</command> using a different
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configuration file to the default. For example,
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<command>systemctl start httpd@foobar.service</command> will
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start httpd using the configuration file
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<filename>/etc/httpd/conf/foobar.conf</filename>. See <citerefentry><refentrytitle>httpd@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> for more information.</para>
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</refsect2>
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</refsect1>
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<refsect1>
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<title>Files</title>
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<para>
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<filename>/etc/httpd/conf/httpd.conf</filename>,
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<filename>/etc/httpd/conf.d</filename>,
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<filename>/etc/httpd/conf.modules.d</filename>
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</para>
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</refsect1>
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<refsect1>
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<title>See also</title>
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<para>
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<citerefentry><refentrytitle>httpd</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>httpd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<ulink url="https://httpd.apache.org/docs/2.4/configuring.html"/>,
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<ulink url="https://httpd.apache.org/docs/2.4/mod/directives.html"/>
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</para>
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</refsect1>
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</refentry>
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<!-- LocalWords: systemd PidFile
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-->
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