修改ulimit文件描述符的最大值
Linux系统里打开文件描述符的最大值，一般缺省值是1024，对一台繁忙的服务器来说，这个值偏小，所以有必要重新设置linux系统里打开文件描述符的最大值。那么应该在哪里设置呢？
永久修改
编辑 /etc/security/limits.conf
root soft nofile 65535
root hard nofile 65535
* soft nofile 65535
* hard nofile 65535重新登录，不需要重启，ulimit -a可以看到文件打开数已经是65534了
[root@VM-123-187-centos ~]# ulimit -a
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 3894
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 65535 #文件打开数已经是65534了
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) 3894
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited临时修改
[root@VM-123-187-centos ~]# ulimit -n
1024
[root@VM-123-187-centos ~]# ulimit -n 65535
[root@VM-123-187-centos ~]# ulimit -n
65535查看某进程可打开的文件数
- 获取某进程ID（6464）
[root@iZj6cac0hudp6vxsqk771aZ proc]# ps aux|grep xxxxx
root 6464 1.4 33.9 3920460 1266508 ? Sl Jun03 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxcat /proc/进程id/limits->cat /proc/6464/limits
[root@iZj6cac0hudp6vxsqk771aZ proc]# cat /proc/6464/limits
Limit Soft Limit Hard Limit Units
Max cpu time unlimited unlimited seconds
Max file size unlimited unlimited bytes
Max data size unlimited unlimited bytes
Max stack size 8388608 unlimited bytes
Max core file size 0 unlimited bytes
Max resident set unlimited unlimited bytes
Max processes 14503 14503 processes
Max open files 65535 65535 files
Max locked memory 65536 65536 bytes
Max address space unlimited unlimited bytes
Max file locks unlimited unlimited locks
Max pending signals 14503 14503 signals
Max msgqueue size 819200 819200 bytes
Max nice priority 0 0
Max realtime priority 0 0
Max realtime timeout unlimited unlimited us 本文参与 腾讯云自媒体同步曝光计划，分享自作者个人站点/博客。
原始发表：2020/06/17 ，如有侵权请联系 cloudcommunity@tencent.com 删除
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