too many open files
出現(xiàn)這句提示的原因是程序打開(kāi)的文件/socket連接數(shù)量超過(guò)系統(tǒng)設(shè)定值。
查看每個(gè)用戶最大允許打開(kāi)文件數(shù)量
ulimit -a
eric@ubuntu:~$?ulimit?-a
core?file?size??????????(blocks,?-c)?0
data?seg?size???????????(kbytes,?-d)?unlimited
scheduling?priority?????????????(-e)?20
file?size???????????????(blocks,?-f)?unlimited
pending?signals?????????????????(-i)?16382
max?locked?memory???????(kbytes,?-l)?64
max?memory?size?????????(kbytes,?-m)?unlimited
open?files??????????????????????(-n)?1024
pipe?size????????????(512?bytes,?-p)?8
POSIX?message?queues?????(bytes,?-q)?819200
real-time?priority??????????????(-r)?0
stack?size??????????????(kbytes,?-s)?8192
cpu?time???????????????(seconds,?-t)?unlimited
max?user?processes??????????????(-u)?unlimited
virtual?memory??????????(kbytes,?-v)?unlimited
file?locks??????????????????????(-x)?unlimited
其中open files (-n) 1024表示每個(gè)用戶最大允許打開(kāi)的文件數(shù)量是1024
查看當(dāng)前系統(tǒng)打開(kāi)的文件數(shù)量
lsof?|?wc?-l
watch?"lsof?|?wc?-l"
查看某一進(jìn)程的打開(kāi)文件數(shù)量
lsof?-p?pid?|?wc?-l
lsof?-p?1234?|?wc?-l
設(shè)置open files數(shù)值方法
ulimit -n 2048
eric@ubuntu:~$?ulimit?-n?2048
eric@ubuntu:~$?ulimit?-a
core?file?size??????????(blocks,?-c)?0
data?seg?size???????????(kbytes,?-d)?unlimited
scheduling?priority?????????????(-e)?20
file?size???????????????(blocks,?-f)?unlimited
pending?signals?????????????????(-i)?16382
max?locked?memory???????(kbytes,?-l)?64
max?memory?size?????????(kbytes,?-m)?unlimited
open?files??????????????????????(-n)?2048
pipe?size????????????(512?bytes,?-p)?8
POSIX?message?queues?????(bytes,?-q)?819200
real-time?priority??????????????(-r)?0
stack?size??????????????(kbytes,?-s)?8192
cpu?time???????????????(seconds,?-t)?unlimited
max?user?processes??????????????(-u)?unlimited
virtual?memory??????????(kbytes,?-v)?unlimited
file?locks??????????????????????(-x)?unlimited
這樣就可以把當(dāng)前用戶的最大允許打開(kāi)文件數(shù)量設(shè)置為2048了再姑，但這種設(shè)置方法在重啟后會(huì)還原為默認(rèn)值蜜葱。
永久設(shè)置方法
vim?/etc/security/limits.conf
在最后加入
*?soft?nofile?4096
*?hard?nofile?4096
最前的*表示所有用戶汁胆，可根據(jù)需要設(shè)置某一用戶井联，例如
eric soft?nofile?8192
eric hard?nofile?8192
改完后注銷(xiāo)一下就能生效疑枯。
