修改程序ulimit限制(不重启应用)

#找出nginx进程
root@VM-131-5-ubuntu:/etc/security# ps -ef |grep nginx
root     16436     1  0 13:01 ?        00:00:00 nginx: master process /usr/sbin/nginx -c /etc/nginx/nginx.conf
nginx    16439 16436  0 13:01 ?        00:00:00 nginx: worker process                   
root     16527 14045  0 13:01 pts/0    00:00:00 grep --color=auto nginx

#找到进程的core文件大小限制
root@VM-131-5-ubuntu:/etc/security# cat /proc/16436/limits  |grep core
Max core file size        0                    unlimited            bytes  

#利用python3 resource模块修改core文件大小限制
root@VM-131-5-ubuntu:/etc/security# python3
Python 3.4.3 (default, Nov 12 2018, 22:25:49) 
[GCC 4.8.4] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import resource
>>> resource.prlimit(16436,resource.RLIMIT_CORE,(-1,-1))   
(0, -1)
>>> exit()

#再次查看该nginx进程的core文件大小限制
root@VM-131-5-ubuntu:/etc/security# cat /proc/16436/limits  |grep core
Max core file size        unlimited            unlimited            bytes