由於線上應用特殊，不能隨意重啟，找到2種動態修改程序ulimits限制的方法。下面舉例修改nginx的core file大小限制
方法一：prlimit工具修改
#安裝新版本的util-linux，由於util-linux版本需要大於等於2.21以上才支持prlimit命令(如果系統有此命令請忽略安裝步驟)。 cd /usr/local/src wget https://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.27/util-linux-2.27.1.tar.gz tar -zxvf util-linux-2.27.1.tar.gz cd util-linux-2.27.1 ./configure --prefix=/usr/share/doc/util-linux-2.27 make && make install cd /usr/share/doc/util-linux-2.27/bin && cp prlimit /usr/bin/ #找出nginx進程 root@VM-131-5-ubuntu:/etc/security# ps -ef |grep nginx |grep -v grep root 6034 1 0 17:16 ? 00:00:00 nginx: master process /usr/sbin/nginx -c /etc/nginx/nginx.conf nginx 6037 6034 0 17:16 ? 00:00:00 nginx: worker process #找到進程的core文件大小限制 root@VM-131-5-ubuntu:/etc/security# cat /proc/6034/limits |grep core Max core file size 0 unlimited bytes #使用prlimit命令修改core文件大小限制 root@VM-131-5-ubuntu:/etc/security# prlimit -p 6034 --core=unlimited: #再次查看該nginx進程的core文件大小限制 root@VM-131-5-ubuntu:/etc/security# cat /proc/6034/limits |grep core Max core file size unlimited unlimited bytes 方法二：python3+ resource模塊 #找出nginx進程 root@VM-131-5-ubuntu:/etc/security# ps -ef |grep nginx |grep -v grep 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 #找到進程的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模塊修改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() #再次查看該nginx進程的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 #調整句柄 resource.RLIMIT_NOFILE