ulimit -a 查看open files数
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 31403
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 65535
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 10240
cpu time (seconds, -t) unlimited
max user processes (-u) 31403
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
修改：
1.修改file-max
# echo 6553560 > /proc/sys/fs/file-max //sysctl -w "fs.file-max=34166"，前面2种重启机器后会恢复为默认值
或
# vim /etc/sysctl.conf, 加入以下内容，重启生效
fs.file-max = 6553560
2.修改ulimit的open file，系统默认的ulimit对文件打开数量的限制是1024
# ulimit -HSn 102400 //这只是在当前终端有效，退出之后，open files又变为默认值。当然也可以写到/etc/profile中，因为每次登录终端时，都会自动执行/etc/profile
或
# vim /etc/security/limits.conf //加入以下配置，重启即可生效
* soft nofile 65535
* hard nofile 65535
