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5.3. php问题汇总

5.3.1. connect() to unix:/var/run/php-fpm/php.sock failed (11: Resource temporarily unavailable) while connecting to upstream

sock方式好像对php支持不好
建议使用tcp方式
The issue is socket itself, its problems on high-load cases is well-known.
Please consider using TCP\IP connection instead of unix socket, for that you need to make these changes:
replace listen = /var/run/php5-fpm.sock with listen = 127.0.0.1:9000
ipc(sock)在highload下php的处理并不好

5.3.2. Fatal error: Allowed memory size of 134217728 bytes exhausted

• 修改 php.ini (默认64M):

  memory_limit = 1024M
  

5.3.3. 一个php-fmp进程占很大内存不释放问题

一块大内存被php-fpm占用的原因:

• php-cgi不存在内存泄漏, 每个请求完成后php-cgi会回收内存, 但是不会释放给操作系统

• 官方解决办法:

• 降低PHP_FCGI_MAX_REQUESTS的值, 对应php-fpm.conf中的max_requests(该值的意思是发送多少个请求后会重启该线程,需要适当降低这个值，让php-fpm自动的释放内存)

• 还有另一个跟它有关联的值max_children, 这个是每次php-fpm会建立多少个进程, 这样实际上的内存消耗是:

  max_children*max_requests*每个请求使用内存
  

• 检查php进程的内存占用，杀掉内存使用超额的进程:

  * * * * * /bin/bash /usr/local/script/kill_php_fpm.sh
  

• kill_php_fpm.sh脚本如下:

  #!/bin/sh
  # This script is used to kill php-cgi process that takes large memory size
  # If a php-cgi process uses 1% or more memory, then it will be killed.
  
  PIDS=`ps aux|grep php-fpm|grep -v grep|awk '{if($4>=1)print $2}'`
  
  for PID in $PIDS
  do
      #echo `date +%F....%T` >> /usr/local/php/logs/phpkill.log
      #echo $PID >> /usr/local/php/logs/phpkill.log
      kill -9  $PID
  done
  

• 设定pm.max_requests后，超过指定请求数后:

  [07-Feb-2015 10:06:48] NOTICE: [pool www] child 19591 exited with code 0 after 52040.698062 seconds from start
  [07-Feb-2015 10:06:49] NOTICE: [pool www] child 17234 started
  

• It is not safe to rely on the system’s timezone settings:

  1.（最好的方法）在php.ini里加上找到date.timezone项，设置date.timezone = "Asia/Shanghai"，重启环境就ok了。
  2.在需要用到这些时间函数的时候，在页面添加date_default_timezone_set("PRC");
  3.在页头加上设置时区ini_set('date.timezone','Asia/Shanghai');
  

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