首先出现这个提示的原因：应用程序打开的文件数量超过了系统设定值。
如何查看当前系统每个用户最大允许打开文件数量：
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[root@registry ~]# ulimit -acore file size (blocks, -c) 0data seg size (kbytes, -d) unlimitedscheduling priority (-e) 0file size (blocks, -f) unlimitedpending signals (-i) 3820max locked memory (kbytes, -l) 64max memory size (kbytes, -m) unlimitedopen files (-n) 1024pipe size (512 bytes, -p) 8POSIX message queues (bytes, -q) 819200real-time priority (-r) 0stack size (kbytes, -s) 8192cpu time (seconds, -t) unlimitedmax user processes (-u) 3820virtual memory (kbytes, -v) unlimitedfile locks (-x) unlimited |
或者
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[root@registry ~]# ulimit -n1024 |
其中 open files (-n) 1024 表示每个用户最大允许打开的文件数量是1024
#查看一下当前已有的连接数，以此来判断open files 为1024 是否足够
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[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 |
其中第一列是打开的文件句柄数量，第二列是进程id号
通过句柄数量最多的进程，查看是哪个应用程序打开了最多的文件句柄，通过命令：
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[root@registry ~]# ps -aef |grep PID |
设置open files 数值的方法
1.临时设置方法
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[root@registry ~]# ulimit -n 4096[root@registry ~]# ulimit -acore file size (blocks, -c) 0data seg size (kbytes, -d) unlimitedscheduling priority (-e) 0file size (blocks, -f) unlimitedpending signals (-i) 3820max locked memory (kbytes, -l) 64max memory size (kbytes, -m) unlimitedopen files (-n) 4096pipe size (512 bytes, -p) 8POSIX message queues (bytes, -q) 819200real-time priority (-r) 0stack size (kbytes, -s) 8192cpu time (seconds, -t) unlimitedmax user processes (-u) 3820virtual memory (kbytes, -v) unlimitedfile locks (-x) unlimited |
这样就可以把当前用户的最大允许打开文件数量设置为4096，但这种设置方法在重启后会还原为默认值。
2.永久设置方法
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[root@registry ~]# vim /etc/security/limits.conf# End of fileroot soft nofile 65535root hard nofile 65535* soft nofile 65535* hard nofile 65535 |
在文件末尾添加上述四行，其中后面两行的 * 表示所有的用户，也可以根据需要设置某一个用户，比如www
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# End of fileroot soft nofile 65535root hard nofile 65535www soft nofile 65535www hard nofile 65535 |
注销账户，重新登录即可生效。
如果想查看某个进程最大允许打开的文件数量，可通过如下命令查看：
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[root@registry ~]# toptop - 15:39:21 up 101 days, 6:26, 1 user, load average: 0.33, 0.57, 0.52Tasks: 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 stKiB Mem : 3881824 total, 111956 free, 3505012 used, 264856 buff/cacheKiB 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/limitsLimit 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 processesMax 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 |