[英]how to find out open file description for linux process?
在运行go程序时,我在日志中发现了很多错误,例如“打开文件太多”,而我只是想找出哪个进程用尽了fds,然后运行以下命令:
lsof -n |awk '{print $2}'|sort|uniq -c |sort -nr
它返回结果如
279605 20341 62748 19861 10310 19712 5434 21318 3484 27344 2842 19781 2400 20372 2346 24153 2123 5214 1540 21123
pid为20341的进程是一个mongod进程,对此我感到很惊讶。 所以我尝试另一种方式:
lsof -p 20341 | wc -l
但令我麻烦的是,结果是: 567 。
之后,我尝试另一种方法: ll /proc/20341/fd | wc -l
ll /proc/20341/fd | wc -l
其结果是496 。
我现在很困惑,哪一个是正确的,它们之间有什么区别?
谢谢。
更新时间:2018-05-31 10:35:33
获取mongodb PID [root@node26 10:34:54 ~]$ps aux | grep mongo mongodb 20341 2.4 1.9 25419812 1257420 ? Sl May28 107:58 /usr/bin/mongod --quiet -f /etc/mongod.conf run
[root@node26 10:34:54 ~]$ps aux | grep mongo mongodb 20341 2.4 1.9 25419812 1257420 ? Sl May28 107:58 /usr/bin/mongod --quiet -f /etc/mongod.conf run
命令lsof -p
[root@node26 10:36:12 ~]$lsof -p 20341 | wc -l 570
[root@node26 10:36:12 ~]$lsof -p 20341 | wc -l 570
目录[root@node26 10:36:33 ~]$ll /proc/20341/fd/ | wc -l 499
[root@node26 10:36:33 ~]$ll /proc/20341/fd/ | wc -l 499
命令lsof + grep
[root@node26 10:37:33 ~]$lsof | grep 20341 | wc -l 282223
[root@node26 10:37:33 ~]$lsof | grep 20341 | wc -l 282223
mongod 20341 mongodb cwd DIR 9,127 4096 2 / mongod 20341 mongodb rtd DIR 9,127 4096 2 / mongod 20341 mongodb txt REG 9,127 12238320 2499177 /usr/bin/mongod mongod 20341 mongodb mem REG 9,127 67108864 1969114 /var/lib/mongodb/a_dev.0 mongod 20341 mongodb mem REG 9,127 536870912 1968852 /var/lib/mongodb/a_dev.ns mongod 20341 mongodb mem REG 9,127 67108864 1968447 /var/lib/mongodb/a.0 mongod 20341 mongodb mem REG 9,127 536870912 1968347 /var/lib/mongodb/a.ns mongod 20341 mongodb mem REG 9,127 67108864 1968453 /var/lib/mongodb/b.0 mongod 20341 mongodb mem REG 9,127 536870912 1968449 /var/lib/mongodb/b.ns mongod 20341 mongodb mem REG 9,127 67108864 1968590 /var/lib/mongodb/c.0
mongod 20341 27018 mongodb 490u IPv4 143223380 0t0 TCP node26:27017->node24:59172 (ESTABLISHED) mongod 20341 27018 mongodb 491u IPv4 143758325 0t0 TCP node26:27017->node25:43016 (ESTABLISHED) mongod 20341 27018 mongodb 492u IPv4 143762443 0t0 TCP node26:27017->node24:60602 (ESTABLISHED) mongod 20341 27018 mongodb 493u IPv4 154865226 0t0 TCP node26:27017->node26:54800 (ESTABLISHED) mongod 20341 27018 mongodb 494u IPv4 164046515 0t0 TCP node26:27017->node24:42952 (ESTABLISHED) mongod 20341 27018 mongodb 495u IPv4 164046516 0t0 TCP node26:27017->node24:42960 (ESTABLISHED) mongod 20341 27018 mongodb 497u IPv4 154865844 0t0 TCP node26:27017->node25:41976 (ESTABLISHED) mongod 20341 27018 mongodb 500u IPv4 164046517 0t0 TCP node26:27017->node24:42968 (ESTABLISHED) mongod 20341 27018 mongodb 502u IPv4 164046518 0t0 TCP node26:27017->node26:60306 (ESTABLISHED) mongod 20341 27018 mongodb 503u IPv4 164046519 0t0 TCP node26:27017->node26:60314 (ESTABLISHED)
mongod 20341 32608 mongodb 492u IPv4 143762443 0t0 TCP node26:27017->node24:60602 (ESTABLISHED) mongod 20341 32608 mongodb 493u IPv4 154865226 0t0 TCP node26:27017->node26:54800 (ESTABLISHED) mongod 20341 32608 mongodb 494u IPv4 164046515 0t0 TCP node26:27017->node24:42952 (ESTABLISHED) mongod 20341 32608 mongodb 495u IPv4 164046516 0t0 TCP node26:27017->node24:42960 (ESTABLISHED) mongod 20341 32608 mongodb 497u IPv4 154865844 0t0 TCP node26:27017->node25:41976 (ESTABLISHED) mongod 20341 32608 mongodb 500u IPv4 164046517 0t0 TCP node26:27017->node24:42968 (ESTABLISHED) mongod 20341 32608 mongodb 502u IPv4 164046518 0t0 TCP node26:27017->node26:60306 (ESTABLISHED) mongod 20341 32608 mongodb 503u IPv4 164046519 0t0 TCP node26:27017->node26:60314 (ESTABLISHED) mongod 20341 32608 mongodb 505u IPv4 164046523 0t0 TCP node26:27017->node26:60322 (ESTABLISHED) mongod 20341 32608 mongodb 730u IPv4 117137926 0t0 TCP node26:27017->node25:54730 (ESTABLISHED)
/proc/${pid}/fd
包含连接到Shell的文件描述符,在lsof
显示为数字,后跟一个u
:
$ la /proc/$$/fd
total 0
lrwx------ 1 username users 64 May 30 20:08 0 -> /dev/pts/0
lrwx------ 1 username users 64 May 30 20:08 1 -> /dev/pts/0
lrwx------ 1 username users 64 May 30 20:08 2 -> /dev/pts/0
lrwx------ 1 username users 64 May 30 20:08 255 -> /dev/pts/0
$ lsof -p $$
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
bash 3720 username cwd DIR 254,3 12288 1835009 /home/username
bash 3720 username rtd DIR 254,2 4096 2 /
bash 3720 username txt REG 254,2 859688 2890163 /usr/bin/bash
bash 3720 username mem REG 254,2 46912 2885785 /usr/lib/libnss_files-2.27.so
bash 3720 username mem REG 254,2 2942480 2930144 /usr/lib/locale/locale-archive
bash 3720 username mem REG 254,2 457800 2890072 /usr/lib/libncursesw.so.6.1
bash 3720 username mem REG 254,2 2105608 2885835 /usr/lib/libc-2.27.so
bash 3720 username mem REG 254,2 14144 2885777 /usr/lib/libdl-2.27.so
bash 3720 username mem REG 254,2 363064 2890132 /usr/lib/libreadline.so.7.0
bash 3720 username mem REG 254,2 177680 2885836 /usr/lib/ld-2.27.so
bash 3720 username 0u CHR 136,0 0t0 3 /dev/pts/0
bash 3720 username 1u CHR 136,0 0t0 3 /dev/pts/0
bash 3720 username 2u CHR 136,0 0t0 3 /dev/pts/0
bash 3720 username 255u CHR 136,0 0t0 3 /dev/pts/0
它们都是“正确的”,但来自lsof
的计数与耗尽打开的文件有关。
要找到相关的打开文件限制,请使用ulimit -n
。
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