httpd-2.4需要较新版本的apr和apr-util，因此需要事先对其进行升级。升级方式有两种，一种是通过源代码编译安装，一种是直接升级rpm包。
这里选择使用编译源代码的方式进行
1、解决依赖关系
yum groupinstall -y "Development Tools" "Server Platform Development"
yum install -y pcre-devel
下载软件包
apr-1.5.0.tar.bz2
apr-util-1.5.3.tar.bz2
httpd-2.4.25.tar.bz2
(1) 编译安装apr
解压并进入目录
./configure --prefix=/usr/local/apr
make && make install
(2) 编译安装@H_403_24@apr-util@H_403_24@
解压进入目录
./configure --prefix=/usr/local/apr-util --with-apr=/usr/lo@H_403_24@ca@H_403_24@l/apr @H_403_24@需要指定@H_403_24@apr@H_403_24@路径@H_403_24@
(3)编译安装@H_403_24@httpd2.4@H_403_24@
./configure --prefix=/usr/local/apache --sysconfdir=/etc/httpd24 --enable-so --enable-ssl --enable-cgi --enable-rewrite --with-zlib --with-pcre --with-apr=/usr/local/apr --with-apr-util=/usr/local/apr-util --enable-modules=most --enable-mpms-shared=all --with-mpm=event
make && make install
补充：
（1）构建MPM为静态模块
在全部平台中，MPM都可以构建为静态模块。在构建时选择一种MPM，链接到服务器中。如果要改变MPM，必须重新构建。为了使用指定的MPM，请在执行configure脚本 时，使用参数 --with-mpm=NAME。
NAME是指定的MPM名称。编译完成后，可以使用 ./httpd -l 来确定选择的MPM。 此命令会列出编译到服务器程序中的所有模块，包括 MPM。
（2）构建 MPM 为动态模块
在Unix或类似平台中，MPM可以构建为动态模块，与其它动态模块一样在运行时加载。 构建 MPM 为动态模块允许通过修改LoadModule指令内容来改变MPM，而不用重新构建服务器程序。
在执行configure脚本时，使用--enable-mpms-shared选项即可启用此特性。当给出的参数为all时，所有此平台支持的MPM模块都会被安装。
还可以在参数中给出模块列表。默认MPM，可以自动选择或者在执行configure脚本时通过--with-mpm选项来指定，然后出现在生成的服务器配置文件中。编辑LoadModule指令内容可以选择不同的MPM。
编辑/etc/httpd/httpd.conf，添加如下行即可：
PidFile "/var/run/httpd.pid"
4、提供SysV服务脚本/etc/rc.d/init.d/httpd，内容如下：
#!/bin/bash
#
# httpd Startup script for the Apache HTTP Server
#
# chkconfig: - 85 15
# description: Apache is a World Wide Web server. It is used to serve \
# HTML files and CGI.
# processname: httpd
# config: /etc/httpd/conf/httpd.conf
# config: /etc/sysconfig/httpd
# pidfile: /var/run/httpd.pid
# Source function library.
. /etc/rc.d/init.d/functions
if [ -f /etc/sysconfig/httpd ]; then
. /etc/sysconfig/httpd
fi
# Start httpd in the C locale by default.
HTTPD_LANG=${HTTPD_LANG-"C"}
# This will prevent initlog from swallowing up a pass-phrase prompt if
# mod_ssl needs a pass-phrase from the user.
INITLOG_ARGS=""
# Set HTTPD=/usr/sbin/httpd.worker in /etc/sysconfig/httpd to use a server
# with the thread-based "worker" MPM; BE WARNED that some modules may not
# work correctly with a thread-based MPM; notably PHP will refuse to start.
# Path to the apachectl script,server binary,and short-form for messages.
apachectl=/usr/local/apache/bin/apachectl
httpd=${HTTPD-/usr/local/apache/bin/httpd}
prog=httpd
pidfile=${PIDFILE-/var/run/httpd.pid}
lockfile=${LOCKFILE-/var/lock/subsys/httpd}
RETVAL=0
start() {
echo -n $"Starting $prog: "
LANG=$HTTPD_LANG daemon --pidfile=${pidfile} $httpd $OPTIONS
RETVAL=$?
echo
[ $RETVAL = 0 ] && touch ${lockfile}
return $RETVAL
}
stop() {
echo -n $"Stopping $prog: "
killproc -p ${pidfile} -d 10 $httpd
RETVAL=$?
echo
[ $RETVAL = 0 ] && rm -f ${lockfile} ${pidfile}
}
reload() {
echo -n $"Reloading $prog: "
if ! LANG=$HTTPD_LANG $httpd $OPTIONS -t >&/dev/null; then
RETVAL=$?
echo $"not reloading due to configuration Syntax error"
failure $"not reloading $httpd due to configuration Syntax error"
else
killproc -p ${pidfile} $httpd -HUP
RETVAL=$?
fi
echo
}
# See how we were called.
case "$1" in
start)
start
;;
stop)
stop
;;
status)
status -p ${pidfile} $httpd
RETVAL=$?
;;
restart)
stop
start
;;
condrestart)
if [ -f ${pidfile} ] ; then
stop
start
fi
;;
reload)
reload
;;
graceful|help|configtest|fullstatus)
$apachectl $@
RETVAL=$?
;;
*)
echo $"Usage: $prog {start|stop|restart|condrestart|reload|status|fullstatus|graceful|help|configtest}"
exit 1
esac
exit $RETVAL
而后为此脚本赋予执行权限：
# chmod +x /etc/rc.d/init.d/httpd
加入服务列表：
# chkconfig --add httpd
接下来就可以启动服务进行测试了。
[root@@H_403_24@Linuxbin]# service httpd restart@H_403_24@
AH00557: httpd: apr_sockaddr_info_get() Failed for@H_403_24@linux.64.114@H_403_24@
AH00558: httpd: Could not reliably determine the server's fully qualified domain@H_403_24@
name,using 127.0.0.1. Set the 'ServerName' directive globally to suppress this@H_403_24@
message@H_403_24@
[root@centos6 httpd24]# pwd
/etc/httpd24
[root@centos6 httpd24]# vim httpd.conf
修改@H_403_24@ServerName@H_403_24@www.example.com:80@H_403_24@为@H_403_24@ ServerName localhost:80@H_403_24@
3@H_403_24@、继续执行@H_403_24@checking whether to enable mod_ssl... configure: error: mod_ssl has been requested but can not be built due to prerequisite failures@H_403_24@，这是因为缺少@H_403_24@openssl@H_403_24@
[root@localhost httpd-2.4.18]# yum install openssl-devel@H_403_24@
4@H_403_24@、最后出现的一个报错是@H_403_24@configure: error: MPM most does not support dynamic loading.@H_403_24@
从字面上可以了解，此时将@H_403_24@--enbale-mpm-shared@H_403_24@改为@H_403_24@all@H_403_24@即可@H_403_24@
