Internal Server Error on cloudlinux

bejbi · Mar 29, 2012

I'm testing CloudLinux with cPanel

I have only one site on my server. Today I have Internal Server Error on this site.

My apache status looks like:

Current Time: Thursday, 29-Mar-2012 16:58:45 CEST
Restart Time: Wednesday, 28-Mar-2012 09:53:56 CEST
Parent Server Generation: 18
Server uptime: 1 day 7 hours 4 minutes 49 seconds
Total accesses: 21481 - Total Traffic: 170.0 MB
CPU Usage: u1.21 s.51 cu0 cs0 - .00154% CPU load
.192 requests/sec - 1593 B/second - 8.1 kB/request
1 requests currently being processed, 124 idle workers

_________________________.......................................
_________________________.......................................
_________________________.......................................
_________________________.......................................
________W________________.......................................
................................................................
................................................................
................................................................

so I have only processes in state "Waiting for Connection"

Connection is only one ... and nothing more. What limit should it be ?

There is many processes of php:

220311 (Trace) (Kill) smart 0 0.0 0.4 /usr/bin/php
226647 (Trace) (Kill) smart 0 0.0 0.4 /usr/bin/php
228701 (Trace) (Kill) smart 0 0.0 0.4 /usr/bin/php
237433 (Trace) (Kill) smart 0 0.0 0.4 /usr/bin/php
239140 (Trace) (Kill) smart 0 0.0 0.4 /usr/bin/php
245895 (Trace) (Kill) smart 0 0.0 0.4 /usr/bin/php
251575 (Trace) (Kill) smart 0 0.0 0.4 /usr/bin/php
255216 (Trace) (Kill) smart 0 0.0 0.4 /usr/bin/php
255369 (Trace) (Kill) smart 0 0.0 0.4 /usr/bin/php
187780 (Trace) (Kill) smart 0 0.0 0.3 /usr/bin/php
188442 (Trace) (Kill) smart 0 0.0 0.3 /usr/bin/php
191328 (Trace) (Kill) smart 0 0.0 0.3 /usr/bin/php
193113 (Trace) (Kill) smart 0 0.0 0.3 /usr/bin/php
193448 (Trace) (Kill) smart 0 0.0 0.3 /usr/bin/php
195743 (Trace) (Kill) smart 0 0.0 0.3 /usr/bin/php
201294 (Trace) (Kill) smart 0 0.0 0.3 /usr/bin/php
207729 (Trace) (Kill) smart 0 0.0 0.3 /usr/bin/php
212233 (Trace) (Kill) smart 0 0.0 0.3 /usr/bin/php
212580 (Trace) (Kill) smart 0 0.0 0.3 /usr/bin/php
221320 (Trace) (Kill) smart 0 0.0 0.3 /usr/bin/php
223370 (Trace) (Kill) smart 0 0.0 0.3 /usr/bin/php
234052 (Trace) (Kill) smart 0 0.0 0.3 /usr/bin/php
236968 (Trace) (Kill) smart 0 0.0 0.3 /usr/bin/php
252737 (Trace) (Kill) smart 0 0.0 0.3 /usr/bin/php
260328 (Trace) (Kill) smart 0 0.0 0.3 /usr/bin/php
236501 (Trace) (Kill) smart 0 0.0 0.2 /usr/bin/php

when I kill one of php process owned by this user - the webpage works correctly.

WHM 11.30.6 (build 6) [TRIAL]
CLOUDLINUX 6.2 x86_64 standard on michael

I have:
Server Version: Apache/2.2.22 (Unix) mod_ssl/2.2.22 OpenSSL/1.0.0-fips mod_bwlimited/1.4 mod_fcgid/2.3.6
Server Built: Mar 21 2012 14:33:15

Why it is so ... I think is very unstable for production ... ? When apache stuck like that ?

WB

iseletsk · Mar 29, 2012

Could you show output of :
uname -a
lveinfo --by-fault=mem
lveps -p

bejbi · Mar 29, 2012

[email protected] [/etc/httpd/domlogs/smart]# uname -a
Linux michael.smarthost.pl 2.6.32-231.21.1.lve0.9.18.1.x86_64 #1 SMP Thu Jan 5 06:59:41 EST 2012 x86_64 x86_64 x86_64 GNU/Linux

===========

[email protected] [/etc/httpd/domlogs/smart]# lveinfo --by-fault=mem
ID aCPU mCPU lCPU aEP mEP lEP aMem mMem lMem MemF MepF

(but now I have any processes)

==========

[email protected] [/etc/httpd/domlogs/smart]# lveps -p
ID EP PNO PID TNO TID CPU MEM I/O
bofh 0 4 --- 4 --- 80 131240 0
--- --- 253180 --- 253180 0 6472 N/A
--- --- 232341 --- 232341 0 6780 N/A
--- --- 222889 --- 222889 0 6464 N/A
--- --- 199842 --- 199842 0 6416 N/A
daniel 0 1 --- 1 --- 12 53276 0
--- --- 252321 --- 252321 0 19344 N/A
smart 0 27 --- 27 --- 3391002348 0
--- --- 260920 --- 260920 0 14424 N/A
--- --- 260328 --- 260328 0 13112 N/A
--- --- 255369 --- 255369 2 12988 N/A
--- --- 255216 --- 255216 1 16848 N/A
--- --- 252737 --- 252737 0 14252 N/A
--- --- 251575 --- 251575 3 13064 N/A
--- --- 245895 --- 245895 5 14932 N/A
--- --- 239140 --- 239140 1 14704 N/A
--- --- 237433 --- 237433 0 17080 N/A
--- --- 236968 --- 236968 0 14188 N/A
--- --- 236501 --- 236501 0 10072 N/A
--- --- 234052 --- 234052 0 13820 N/A
--- --- 228701 --- 228701 5 14144 N/A
--- --- 226647 --- 226647 2 12808 N/A
--- --- 223370 --- 223370 0 13732 N/A
--- --- 221320 --- 221320 0 13996 N/A
--- --- 220311 --- 220311 0 16796 N/A
--- --- 212580 --- 212580 0 17520 N/A
--- --- 212233 --- 212233 0 16016 N/A
--- --- 207729 --- 207729 1 17788 N/A
--- --- 201294 --- 201294 0 16948 N/A
--- --- 195743 --- 195743 2 17512 N/A
--- --- 193448 --- 193448 0 16868 N/A
--- --- 193113 --- 193113 0 17840 N/A
--- --- 191328 --- 191328 0 17384 N/A
--- --- 188442 --- 188442 1 18592 N/A
--- --- 187780 --- 187780 0 14544 N/A

iseletsk · Mar 29, 2012

Are you running mod_fcgid?
Could you re-run lveinfo like this:
lveinfo --by-fault=mem --period=2d

SoR · Mar 29, 2012

Hello,

Yes, we are using mod_fcgi. Here is the output od your command:
lveinfo --by-fault=mem --period=2d

ID aCPU mCPU lCPU aEP mEP lEP aMem mMem lMem MemF MepF
502 0 1 12 0 2 20 466K 1.0G 1.0G 19 0

bejbi · Mar 29, 2012

Now I have error again !

problem is with user: "smart". Website looks like: www.smarthost.pl

and You test when there is an error:

[email protected] [/home/wojtek]# lveinfo --by-fault=mem --period=2d
ID aCPU mCPU lCPU aEP mEP lEP aMem mMem lMem MemF MepF
502 0 1 12 0 2 20 658K 1.0G 1.0G 21 0

[email protected] [/home/wojtek]# lveps -p
ID EP PNO PID TNO TID CPU MEM I/O
bofh 0 4 --- 4 --- 80 131240 0
--- --- 253180 --- 253180 0 6472 N/A
--- --- 232341 --- 232341 0 6780 N/A
--- --- 222889 --- 222889 0 6464 N/A
--- --- 199842 --- 199842 0 6416 N/A
daniel 0 1 --- 1 --- 12 53276 0
--- --- 252321 --- 252321 0 19344 N/A
smart 0 27 --- 27 --- 3501001692 0
--- --- 267769 --- 267769 0 13580 N/A
--- --- 260328 --- 260328 0 13112 N/A
--- --- 255369 --- 255369 2 12988 N/A
--- --- 255216 --- 255216 1 16848 N/A
--- --- 252737 --- 252737 0 14252 N/A
--- --- 251575 --- 251575 3 13064 N/A
--- --- 245895 --- 245895 5 14932 N/A
--- --- 239140 --- 239140 1 14704 N/A
--- --- 237433 --- 237433 0 17080 N/A
--- --- 236968 --- 236968 0 14188 N/A
--- --- 236501 --- 236501 0 10072 N/A
--- --- 234052 --- 234052 0 13820 N/A
--- --- 228701 --- 228701 5 14144 N/A
--- --- 226647 --- 226647 2 12808 N/A
--- --- 223370 --- 223370 0 13732 N/A
--- --- 221320 --- 221320 0 13996 N/A
--- --- 220311 --- 220311 0 16796 N/A
--- --- 212580 --- 212580 0 17520 N/A
--- --- 212233 --- 212233 0 16016 N/A
--- --- 207729 --- 207729 1 17788 N/A
--- --- 201294 --- 201294 0 16948 N/A
--- --- 195743 --- 195743 2 17512 N/A
--- --- 193448 --- 193448 0 16868 N/A
--- --- 193113 --- 193113 0 17840 N/A
--- --- 191328 --- 191328 0 17384 N/A
--- --- 188442 --- 188442 1 18592 N/A
--- --- 187780 --- 187780 0 14544 N/A

bejbi · Mar 30, 2012

LVE manager shows something like this:

LVE Id User Domain Concurrent Connections Processes Threads CPU % Memory
509 (?)(c) bofh bofh.smarthost.pl 0 5 5 0% 168.0M
505 (?)(c) daniel testdaniel.smarthost.pl 0 1 1 0% 52.0M
502 (?)(c) smart smarthost.pl 0 27 27 0%1001692 0K

in column %CPU shows: "0%1001692" it looks suspicus ...

Maybe the reason of apache stuck is default setting od LVE "persist" checked "on" ?

NixTree · Mar 30, 2012

Hello,

I wonder why do you use CloudLinux on a server, which only have "one" website?

Thank you,
Nibin.

bejbi · Mar 30, 2012

I have many servers with many account (>300-500 on each). Now I'm testing CludLinux - so on this testing server is for now only one domain ... I can't create customers account on unstable/untested system. What I would say my customer when he will see Internal Server Error on small website ? Now I do tests ... It is no production on this server.

iseletsk · Mar 30, 2012

This internal server error is due to memory limits. Increase limits -- it will start working.
Are you using mod_fcgid?

bejbi · Mar 31, 2012

Yes, I'm using fastCGi compilled in apache by easycapache. It is probably not by memory limits ... when I have Internal Server Error my site was viewed by no one.

But I have answer - probably it is a bug in memory limit in CloudLinux - I'm using APC module for PHP. In logs I have (now I found):
PHP Fatal error: PHP Startup: apc_mmap: mmap failed: in Unknown on line 0
so I try to remove APC ... and I will see. But if You could try too - if APC module is not break LVE limit ? Or maybe it is a problem in APC itself ?

iseletsk · Mar 31, 2012

It is a memory limits, as seen by this:
lveinfo --by-fault=mem --period=2d

ID aCPU mCPU lCPU aEP mEP lEP aMem mMem lMem MemF MepF
502 0 1 12 0 2 20 466K 1.0G 1.0G 19 0

And it s not a bug.

mod_fcgid by default allows 100 processes per site, which just keep accumulating. This is also seen by lveps -p -- you have bunch of them there, living, doing nothing.

Add:
FcgidMaxProcessesPerClass 8
FcgidMinProcessesPerClass 0
FcgidIdleScanInterval 60
FcgidIdleTimeout 120
FcgidProcessLifeTime 240

To your apache config -- that will optimize your mod_fcgid settings, and should prevent you from hitting memory limits for a user all the time.

iseletsk · Mar 31, 2012

Another way to test is to disable memory limits:
lvectl set default --mem=0 --save
lvectl apply all

bejbi · Apr 1, 2012

I read info on this page:
Configuring Initial LVE settings

And my ve.cfg say that: <ubc enabled="false"></ubc>

so have I memory limit enabled or not ?

iseletsk · Apr 1, 2012

It is enabled. This option has no effect on CL6 kernel.

bejbi · Apr 1, 2012

OK, thanks, I think such information should be on the website too

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Internal Server Error on cloudlinux

bejbi

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SoR

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