nginx fpm-children eror

最近接手nginx+php的WEB环境维护，发现PHP-cgiCPU很好，也造成负载很高，于是在网上找了些资料，并且针对自己的错误，将问题收集再次，并且网上还给了解决方案，所以放在这里留作以后查询
an 11 08:54:01.164292 [NOTICE] fpm_children_make(), line 352: child 10088 (pool default) started
Jan 11 08:54:01.164325 [WARNING] fpm_children_bury(), line 215: child 7985 (pool default) exited on signal 15 SIGTERM after 63.778601 seconds from start
Jan 11 08:54:01.165485 [NOTICE] fpm_children_make(), line 352: child 10089 (pool default) started
Jan 11 08:54:01.165514 [WARNING] fpm_children_bury(), line 215: child 7999 (pool default) exited on signal 15 SIGTERM after 60.297326 seconds from start
Jan 11 08:54:01.166696 [NOTICE] fpm_children_make(), line 352: child 10090 (pool default) started
Jan 11 08:54:01.166727 [WARNING] fpm_children_bury(), line 215: child 8000 (pool default) exited on signal 15 SIGTERM after 60.296946 seconds from start
Jan 11 08:54:01.167855 [NOTICE] fpm_children_make(), line 352: child 10091 (pool default) started

以上是php日志的警告信息

解决方法

1、提升服务器的文件句柄打开打开
/etc/security/limits.conf : (增加)
*    soft    nofile    51200
*    hard    nofile    51200
# vi /etc/security/limits.conf 加上
* soft nofile 51200
* hard nofile 51200
2、提升nginx的进程文件打开数
nginx.conf : worker_rlimit_nofile 51200;
3、修改php-fpm.conf文件，主要需要修改2处。
命令 ulimit -n 查看限制的打开文件数，php-fpm.conf 中的选项rlimit_files 确保和此数值一致。
<value name="max_requests">10240</value>
<value name="rlimit_files">51200</value>
4、修改系统内核
# vi /etc/sysctl.conf
底部添加
fs.file-max=51200