accept: Too many open files

postcd · 04-24-2014, 04:47 AM

Hello, i enabled ssh proxy on server using this tutorial and after around hour very roughly i started getting these messages in terminal.

Quote:

accept: Too many open files
accept: Too many open files
accept: Too many open files

It was like a flood so i was unable to enter any command. So from VPS host server i did "pkill -f mysshporthere" and it stopped

"lsof" returned something like this:

Quote:

ssh 7755 root 957u IPv4 837165782 0t0 TCP vps.mydomainhere.com:socks->67.198.*.*.CUSTOMER.*.COM:* (FIN_WAIT2)
ssh 7755 root 958u IPv4 839566319 0t0 TCP vps.mydomainhere:socks->67.198.*.*.CUSTOMER.*.COM:* (ESTABLISHED)
...and around 200 similar..

So i want to ask where i can increase this open files limit value, or what do you recommend doing when this flood happen again? thx

----
Moreover im getting flood of:

Code:

channel *: open failed: administratively prohibited: open failed

sag47 · 04-24-2014, 08:02 AM

Check your ulimit. The number of open file descriptors allowed for a user by default is only 1024. Note my user is "sam".

Code:

$ ulimit -a sam | grep 'open files'
open files                      (-n) 1024

You can increase the number of open files you have so long as there isn't a hard limit on your account.

Code:

$ ulimit -n 10000 sam
$ ulimit -a sam | grep 'open files'
open files                      (-n) 10000

There's a RedHat article on ulimit which describes it more verbosely which describes checking the system limit for open file descriptors as well as making your change permanent for your user.

postcd · 04-24-2014, 09:56 AM

Thx, i tried this now, and i set limit to 200,000

instead im getting flood of errors:

Quote:

channel *: open failed: administratively prohibited: open failed

* = some 4 digit number

when config server firewall is turned off, this message dont happens

ghp · 02-24-2017, 07:31 AM

Quote:

Originally Posted by postcd

Thx, i tried this now, and i set limit to 200,000

instead im getting flood of errors:

* = some 4 digit number

when config server firewall is turned off, this message dont happens

There are other limits a part from ulimit, eg. check:
cat /proc/sys/fs/file-max