【www.bbyears.com--php常用代码】
一、进程跟踪
代码如下 # top //找出CPU使用率高的进程PID# strace -p PID //跟踪进程
# ll /proc/PID/fd //查看该进程在处理哪些文件
将有可疑的PHP代码修改之，如：file_get_contents没有设置超时时间。
二、内存分配
如果进程跟踪无法找到问题所在，再从系统方面找原因，会不会有可能内存不够用？据说一个较为干净的PHP-CGI打开大概20M-30M左右的内存，决定于PHP模块开启多少。
通过pmap指令查看PHP-CGI进程的内存使用情况
# pmap $(pgrep php-cgi |head -1)
按输出的结果，结合系统的内存大小，配置PHP-CGI的进程数（max_children）。
三、监控
最后，还可以通过监控与自动恢复的脚本保证服务的正常运转。下面是我用到的一些脚本：
只要一个php-cgi进程占用的内存超过 %1 就把它kill掉
#!/bin/sh
PIDS=`ps aux|grep php-cgi|grep -v grep|awk’{if($4>=1)print $2}’`
for PID in $PIDS
do
echo `date +%F….%T`>>/data/logs/phpkill.log
echo $PID >> /data/logs/phpkill.log
kill -9 $PID
done
检测php-fpm进程
代码如下#!/bin/bash
netstat -tnlp | grep “php-cgi” >> /dev/null #2&> /data/logs/php_fasle.log
if [ "$?" -eq "1" ];then #&& [ `netstat -tnlp | grep 9000 | awk "{ print $4}" | awk -F ":" "{print $2}"` -eq "1" ];then
/usr/local/webserver/php/sbin/php-fpm start
echo `date +%F….%T` “System memory OOM.Kill php-cgi. php-fpm service start. ” >> /data/logs/php_monitor.log
fi
通过http检测php执行
代码如下#!/bin/bash
status=`curl -s –head “http://127.0.0.1:8080/chk.php” | awk ‘/HTTP/ {print $2}’`
if [ $status != "200" -a $status != "304" ]; then
/usr/local/webserver/php/sbin/php-fpm restart
echo `date +%F….%T` “php-fpm service restart” >> /data/logs/php_monitor.log
fi
解决方法二
如果你常用上面复杂我们可以按下步骤来监控与重启PHP-FPM来解决此问题
PHP-FPM启动脚本/etc/init.d/php-fpm
从PHP 5.3.3开始就已经集成了PHP-FPM所以php-fpm在PHP 5.3.2以后的版本不支持以前的php-fpm (start|restart|stop|reload) 了，不用专门再打补丁了，只需要解开源码直接configure，关于php-fpm的编译参数有
--enable-fpm --with-fpm-user=www --with-fpm-group=www --with-libevent-dir=libevent
位置
进入到php源代码目录下，然后：
cp -f (php -5.3.x-source-dir)/sapi/fpm/init.d.php-fpm /etc/init.d/php-fpm
代码如下#! /bin/sh
### BEGIN INIT INFO
# Provides: php-fpm
# Required-Start: $remote_fs $network
# Required-Stop: $remote_fs $network
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: starts php-fpm
# Description: starts the PHP FastCGI Process Manager daemon
### END INIT INFO
prefix=/usr/local/php
exec_prefix=${prefix}
php_fpm_BIN=${exec_prefix}/sbin/php-fpm
php_fpm_CONF=${prefix}/etc/php-fpm.conf
php_fpm_PID=${prefix}/var/run/php-fpm.pid
php_opts="--fpm-config $php_fpm_CONF"
wait_for_pid () {
try=0
while test $try -lt 35 ; do
case "$1" in
"created")
if [ -f "$2" ] ; then
try=""
break
fi
;;
"removed")
if [ ! -f "$2" ] ; then
try=""
break
fi
;;
esac
echo -n .
try=`expr $try + 1`
sleep 1
done
}
case "$1" in
start)
echo -n "Starting php-fpm "
$php_fpm_BIN $php_opts
if [ "$?" != 0 ] ; then
echo " failed"
exit 1
fi
wait_for_pid created $php_fpm_PID
if [ -n "$try" ] ; then
echo " failed"
exit 1
else
echo " done"
fi
;;
stop)
echo -n "Gracefully shutting down php-fpm "
if [ ! -r $php_fpm_PID ] ; then
echo "warning, no pid file found - php-fpm is not running ?"
exit 1
fi
kill -QUIT `cat $php_fpm_PID`
wait_for_pid removed $php_fpm_PID
if [ -n "$try" ] ; then
echo " failed. Use force-quit"
exit 1
else
echo " done"
fi
;;
force-quit)
echo -n "Terminating php-fpm "
if [ ! -r $php_fpm_PID ] ; then
echo "warning, no pid file found - php-fpm is not running ?"
exit 1
fi
kill -TERM `cat $php_fpm_PID`
wait_for_pid removed $php_fpm_PID
if [ -n "$try" ] ; then
echo " failed"
exit 1
else
echo " done"
fi
;;
restart)
$0 stop
$0 start
;;
reload)
echo -n "Reload service php-fpm "
if [ ! -r $php_fpm_PID ] ; then
echo "warning, no pid file found - php-fpm is not running ?"
exit 1
fi
kill -USR2 `cat $php_fpm_PID`
echo " done"
;;
*)
echo "Usage: $0 {start|stop|force-quit|restart|reload}"
exit 1
;;
esac
编辑好后保存，执行以下命令
代码如下chmod +x /etc/init.d/php-fpm
chkconfig php-fpm on
# 检查一下
chkconfig --list php-fpm
php-fpm 0:off 1:off 2:on 3:on 4:on 5:on 6:off
完成！可以使用以下命令管理php-fpm了
代码如下service php-fpm start
service php-fpm stop
service php-fpm restart
service php-fpm reload
/etc/init.d/php-fpm start
/etc/init.d/php-fpm stop
/etc/init.d/php-fpm restart
/etc/init.d/php-fpm reload
运行service php-fpm start提示出错，怎么都没找到问题所在，后来才知道要把php-fpm.conf里的PID路径前的:分号删掉！