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【原创文章】WDCP系统下httpd无法启动的原因及解决办法

系统防护 百蔬君 5338℃ 已收录 0评论

今天备份数据库，偶然发现phpmyadmin无论怎样都无法打开，用ip打开网站竟然还出现了502的“网关错误”提示。由于采用额web环境是nginx+apache+mysql的方案，发现网站还是很正常的在运作，只是ip访问的默认网站打不开，查看了一下配置文件的，发现在php的处理方式不同。

主站的php处理方式是

        location ~ \.php(.*)$ {
                fastcgi_pass  unix:/tmp/php-52-cgi.sock;
                fastcgi_index  index.php;
                fastcgi_param  SCRIPT_FILENAME  $DOCUMENT_ROOT$fastcgi_script_name;
                fastcgi_param PATH_INFO $2;
                include fcgi.conf;
        }

而default网站的处理方式是

        location ~ \.php$ {
                proxy_pass http://127.0.0.1:88;
                include naproxy.conf;
        }

我把主站的php处理代码放到default的配置文件中去，网站打开了，那么看来是 proxy_pass http://127.0.0.1:88;这里出问题了。

来回折腾了好久，跑去端口看了一下，发现88端口竟然没有打开，原来是httpd的进程没有启动。

在进程管理那里点击启动httpd，提示“启动失败”。

登陆ssh，执行命令service httpd restart，竟然告诉我说绑定80端口失败，哎哟，看来是httpd的配置文件出问题了，这里应当是绑定88端口才对啊。

思前想后，跟昨天系统启动失败一样（CENTOS kernel panic无法对未知的块安装根文件系统的解决办法），都是因为执行了yum update惹的祸，执行这个命令后重新安装了一个kernel，httpd，所以系统加载kernel和httpd的配置文件被修改了。

屁颠屁颠跑去/etc/init.d查看httpd的配置内容

#!/bin/bash
#
# httpd        Startup script for the Apache HTTP Server
#
# chkconfig: - 85 15
# description: The Apache HTTP Server is an efficient and extensible  \
#	       server implementing the current HTTP standards.
# processname: httpd
# config: /etc/httpd/conf/httpd.conf
# config: /etc/sysconfig/httpd
# pidfile: /var/run/httpd/httpd.pid
#
### BEGIN INIT INFO
# Provides: httpd
# Required-Start: $local_fs $remote_fs $network $named
# Required-Stop: $local_fs $remote_fs $network
# Should-Start: distcache
# Short-Description: start and stop Apache HTTP Server
# Description: The Apache HTTP Server is an extensible server 
#  implementing the current HTTP standards.
### END INIT INFO

# 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/sbin/apachectl
httpd=${HTTPD-/usr/sbin/httpd}
prog=httpd
pidfile=${PIDFILE-/var/run/httpd/httpd.pid}
lockfile=${LOCKFILE-/var/lock/subsys/httpd}
RETVAL=0
STOP_TIMEOUT=${STOP_TIMEOUT-10}

# The semantics of these two functions differ from the way apachectl does
# things -- attempting to start while running is a failure, and shutdown
# when not running is also a failure.  So we just do it the way init scripts
# are expected to behave here.
start() {
        echo -n $"Starting $prog: "
        LANG=$HTTPD_LANG daemon --pidfile=${pidfile} $httpd $OPTIONS
        RETVAL=$?
        echo
        [ $RETVAL = 0 ] && touch ${lockfile}
        return $RETVAL
}

# When stopping httpd, a delay (of default 10 second) is required
# before SIGKILLing the httpd parent; this gives enough time for the
# httpd parent to SIGKILL any errant children.
stop() {
	status -p ${pidfile} $httpd > /dev/null
	if [[ $? = 0 ]]; then
		echo -n $"Stopping $prog: "
		killproc -p ${pidfile} -d ${STOP_TIMEOUT} $httpd
	else
		echo -n $"Stopping $prog: "
		success
	fi
	RETVAL=$?
	echo
	[ $RETVAL = 0 ] && rm -f ${lockfile} ${pidfile}
}

reload() {
    echo -n $"Reloading $prog: "
    if ! LANG=$HTTPD_LANG $httpd $OPTIONS -t >&/dev/null; then
        RETVAL=6
        echo $"not reloading due to configuration syntax error"
        failure $"not reloading $httpd due to configuration syntax error"
    else
        # Force LSB behaviour from killproc
        LSB=1 killproc -p ${pidfile} $httpd -HUP
        RETVAL=$?
        if [ $RETVAL -eq 7 ]; then
            failure $"httpd shutdown"
        fi
    fi
    echo
}

# See how we were called.
case "$1" in
  start)
	start
	;;
  stop)
	stop
	;;
  status)
        status -p ${pidfile} $httpd
	RETVAL=$?
	;;
  restart)
	stop
	start
	;;
  condrestart|try-restart)
	if status -p ${pidfile} $httpd >&/dev/null; then
		stop
		start
	fi
	;;
  force-reload|reload)
        reload
	;;
  graceful|help|configtest|fullstatus)
	$apachectl $@
	RETVAL=$?
	;;
  *)
	echo $"Usage: $prog {start|stop|restart|condrestart|try-restart|force-reload|reload|status|fullstatus|graceful|help|configtest}"
	RETVAL=2
esac

exit $RETVAL

果然http已经被指向系统原始httpd程序了

apachectl=/usr/sbin/apachectl
httpd=${HTTPD-/usr/sbin/httpd}
prog=httpd
pidfile=${PIDFILE-/var/run/httpd/httpd.pid}
lockfile=${LOCKFILE-/var/lock/subsys/httpd}

找到问题就好办了，我们把wdcp修改过的httpd启动文件copy过来就好了，重新指向一下httpd的路径就好了。

#!/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: /www/wdlinux/apache/conf/httpd.conf
# config: /etc/sysconfig/httpd
# pidfile: /www/wdlinux/apache/logs/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=/www/wdlinux/apache/bin/apachectl
httpd=${HTTPD-/www/wdlinux/apache/bin/httpd}
prog=httpd
pidfile=${PIDFILE-/www/wdlinux/apache/logs/httpd.pid}
lockfile=${LOCKFILE-/var/lock/subsys/httpd}
RETVAL=0

# The semantics of these two functions differ from the way apachectl does
# things -- attempting to start while running is a failure, and shutdown
# when not running is also a failure.  So we just do it the way init scripts
# are expected to behave here.
start() {
        echo -n $"Starting $prog: "
        LANG=$HTTPD_LANG daemon --pidfile=${pidfile} $httpd $OPTIONS
        RETVAL=$?
        echo
        [ $RETVAL = 0 ] && touch ${lockfile}
        return $RETVAL
}

# When stopping httpd a delay of >10 second is required before SIGKILLing the
# httpd parent; this gives enough time for the httpd parent to SIGKILL any
# errant children.
stop() {
	echo -n $"Stopping $prog: "
	killproc -p ${pidfile} -d 3 $httpd
	RETVAL=$?
	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

可以比较这两个文件，最大的差别就是apachectl，httpd，pidfile等几个参数的路径不同了。

再次重启httpd就成功了。

另外普及一下wdcp的基础知识。

wdcp优化的系统服务配置文件在/www/wdlinux/init.d目录，比如httpd memcached mysqld nginxd php-fpm pureftpd，把这些文件放到系统的/etc/init.d目录，那么就按照你的配置启动服务了。

wdcp的软件配置文件在/www/wdlinux/etc/，比如memcached.conf my.cnf php-fpm.conf php.ini pure-ftpd.conf，这些。

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