首先出現這個提示的原因：應用程序打開的文件數量超過了系統設定值。

如何查看當前系統每個用戶最大允許打開文件數量：

[root@registry ~]# 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) 3820

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) 3820

virtual memory (kbytes, -v) unlimited

file locks (-x) unlimited

或者

[root@registry ~]# ulimit -n

1024

其中?open files (-n) 1024?表示每個用戶最大允許打開的文件數量是1024

#查看一下當前已有的連接數，以此來判斷open files 為1024 是否足夠

[root@registry ~]# lsof -n |awk '{print$2}'|sort |uniq -c |sort -nr |more

590 5458

445 1065

306 638

267 770

190 5682

189 5457

158 704

130 1194

117 681

81 1263

68 5419

66 640

62 1

60 5677

57 678

55 1067

51 9036

51 1196

48 5698

44 677

44 470

38 494

32 637

29 4430

20 4614

17 9250

14 4566

12 9256

12 9251

11 9254

11 9252

10 9255

10 693

9 9253

3 92

3 9037

3 9033

3 9

3 8964

3 8

3 726

其中第一列是打開的文件句柄數量，第二列是進程id號

通過句柄數量最多的進程，查看是哪個應用程序打開了最多的文件句柄，通過命令：

[root@registry ~]# ps -aef |grep PID

設置open files 數值的方法

1.臨時設置方法

[root@registry ~]# ulimit -n 4096

[root@registry ~]# 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) 3820

max locked memory (kbytes, -l) 64

max memory size (kbytes, -m) unlimited

open files (-n) 4096

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) 3820

virtual memory (kbytes, -v) unlimited

file locks (-x) unlimited

這樣就可以把當前用戶的最大允許打開文件數量設置為4096，但這種設置方法在重啟后會還原為默認值。

2.永久設置方法

[root@registry ~]# vim /etc/security/limits.conf

# End of file

root soft nofile 65535

root hard nofile 65535

* soft nofile 65535

* hard nofile 65535

在文件末尾添加上述四行，其中后面兩行的 * 表示所有的用戶，也可以根據需要設置某一個用戶，比如www

# End of file

root soft nofile 65535

root hard nofile 65535

www soft nofile 65535

www hard nofile 65535

注銷賬戶，重新登錄即可生效。

如果想查看某個進程最大允許打開的文件數量，可通過如下命令查看：

[root@registry ~]# top

top - 15:39:21 up 101 days, 6:26, 1 user, load average: 0.33, 0.57, 0.52

Tasks: 70 total, 1 running, 69 sleeping, 0 stopped, 0 zombie

%Cpu(s): 6.7 us, 0.0 sy, 0.0 ni, 93.3 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st

KiB Mem : 3881824 total, 111956 free, 3505012 used, 264856 buff/cache

KiB Swap: 2047996 total, 1001156 free, 1046840 used. 123968 avail Mem

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND

12872 www 20 0 2738092 743948 2292 S 6.7 19.2 652:05.43 java

1 root 20 0 43380 2244 1352 S 0.0 0.1 4:11.26 systemd

2 root 20 0 0 0 0 S 0.0 0.0 0:00.31 kthreadd

3 root 20 0 0 0 0 S 0.0 0.0 28:18.97 ksoftirqd/0

5 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kworker/0:0H

7 root rt 0 0 0 0 S 0.0 0.0 0:00.00 migration/0

8 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcu_bh

9 root 20 0 0 0 0 S 0.0 0.0 33:52.08 rcu_sched

10 root rt 0 0 0 0 S 0.0 0.0 0:39.61 watchdog/0

12 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kdevtmpfs

13 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 netns

14 root 20 0 0 0 0 S 0.0 0.0 0:07.72 khungtaskd

15 root 0 -20 0 0 0 S 0.0 0.0 0:00.18 writeback

16 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kintegrityd

17 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 bioset

18 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kblockd

19 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 md

25 root 20 0 0 0 0 S 0.0 0.0 12:21.57 kswapd0

26 root 25 5 0 0 0 S 0.0 0.0 0:00.00 ksmd

27 root 39 19 0 0 0 S 0.0 0.0 0:17.32 khugepaged

28 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 crypto

36 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kthrotld

38 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kmpath_rdacd

39 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kpsmoused

40 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 ipv6_addrconf

59 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 deferwq

101 root 20 0 0 0 0 S 0.0 0.0 0:03.48 kauditd

225 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 ata_sff

233 root 20 0 0 0 0 S 0.0 0.0 0:00.00 scsi_eh_0

234 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 scsi_tmf_0

235 root 20 0 0 0 0 S 0.0 0.0 0:00.00 scsi_eh_1

236 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 scsi_tmf_1

240 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 ttm_swap

252 root 0 -20 0 0 0 S 0.0 0.0 1:07.64 kworker/0:1H

257 root 20 0 0 0 0 S 0.0 0.0 3:12.26 jbd2/vda1-8

258 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 ext4-rsv-conver

325 root 20 0 119080 5460 5316 S 0.0 0.1 5:27.58 systemd-journal

354 root 20 0 44032 8 4 S 0.0 0.0 0:00.08 systemd-udevd

[root@registry ~]# cat /proc/12872/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 65535 65535 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 15089 15089 signals

Max msgqueue size 819200 819200 bytes

Max nice priority 0 0

Max realtime priority 0 0

Max realtime timeout unlimited unlimited us

總結

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