在ubuntu 14.04生产web服务器上，我进行如下设置：
/etc/security/limits.conf
* soft nproc 65535
* hard nproc 65535
* soft nofile 65535
* hard nofile 65535
/etc/pam.d/common-session
session [default=1] pam_permit.so
session requisite pam_deny.so
session required pam_permit.so
session optional pam_umask.so
session required pam_unix.so
session optional pam_systemd.so
session required pam_limits.so
/etc/pam.d/common-session-noninteractive
session [default=1] pam_permit.so
session requisite pam_deny.so
session required pam_permit.so
session optional pam_umask.so
session required pam_unix.so
session required pam_limits.so
即使重启后，ulimit -n 仍然输出 1024。下面的某个配置是否导致了这个问题？
/etc/sysctl.conf
net.ipv4.ip_local_port_range = 1024 65535
net.ipv4.tcp_tw_reuse = 1
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.ipv4.tcp_max_syn_backlog = 4096
net.ipv4.tcp_syncookies = 1
net.core.somaxconn = 16384
fs.file-max = 65535
$ sysctl fs.file-max
fs.file-max = 65535
$ 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) 1026931
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) 1026931
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
答案1
检查之前是否没有其他进程启动并更改 ulimit，就像使用主管执行此操作一样：https://underyx.me/2015/05/18/raising-the-maximum-number-of-file-descriptors