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Nginx + php-fpm "504 Gateway Time-out" error with almost zero load (on a test-server)

Posted by rahul286 
Nginx + php-fpm "504 Gateway Time-out" error with almost zero load (on a test-server)
September 07, 2010 03:12AM
Hi All,

After debugging for 6-hours - I am giving this up :|

We have a nginx+php-fpm+mysql in LAN with almost 100 wordpress
(created and used by different designers/developers all working on
test wordpres setup)

We are using nginx without any issues from long.

Today, all of a sudden - nginx started returning "504 Gateway Time-
out" out of the blue...

I checked nginx error log for a virtual host...
2010/09/06 21:24:24 [error] 12909#0: *349 upstream timed out (110:
Connection timed out) while reading response header from upstream,
client: 192.168.0.1, server: rahul286.rtcamp.info, request: "GET /
favicon.ico HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host:
"rahul286.rtcamp.info"
2010/09/06 21:25:11 [error] 12909#0: *349 recv() failed (104:
Connection reset by peer) while reading response header from upstream,
client: 192.168.0.1, server: rahul286.rtcamp.info, request: "GET /
favicon.ico HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host:
"rahul286.rtcamp.info"
2010/09/06 21:25:11 [error] 12909#0: *443 recv() failed (104:
Connection reset by peer) while reading response header from upstream,
client: 192.168.0.1, server: rahul286.rtcamp.info, request: "GET /
info.php HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host:
"rahul286.rtcamp.info"
2010/09/06 21:25:12 [error] 12909#0: *443 connect() failed (111:
Connection refused) while connecting to upstream, client: 192.168.0.1,
server: rahul286.rtcamp.info, request: "GET /favicon.ico HTTP/1.1",
upstream: "fastcgi://127.0.0.1:9000", host: "rahul286.rtcamp.info"
2010/09/06 22:08:32 [error] 12909#0: *1025 upstream timed out (110:
Connection timed out) while reading response header from upstream,
client: 192.168.0.1, server: rahul286.rtcamp.info, request: "GET /
HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host:
"rahul286.rtcamp.info"
2010/09/06 22:09:33 [error] 12909#0: *1025 upstream timed out (110:
Connection timed out) while reading response header from upstream,
client: 192.168.0.1, server: rahul286.rtcamp.info, request: "GET /
favicon.ico HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host:
"rahul286.rtcamp.info"
2010/09/06 22:09:40 [error] 12909#0: *1064 recv() failed (104:
Connection reset by peer) while reading response header from upstream,
client: 192.168.0.1, server: rahul286.rtcamp.info, request: "GET /
info.php HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host:
"rahul286.rtcamp.info"
2010/09/06 22:09:40 [error] 12909#0: *1064 connect() failed (111:
Connection refused) while connecting to upstream, client: 192.168.0.1,
server: rahul286.rtcamp.info, request: "GET /favicon.ico HTTP/1.1",
upstream: "fastcgi://127.0.0.1:9000", host: "rahul286.rtcamp.info"
2010/09/06 22:24:44 [error] 12909#0: *1313 upstream timed out (110:
Connection timed out) while reading response header from upstream,
client: 192.168.0.1, server: rahul286.rtcamp.info, request: "GET /
HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host:
"rahul286.rtcamp.info"
2010/09/06 22:24:53 [error] 12909#0: *1313 recv() failed (104:
Connection reset by peer) while reading response header from upstream,
client: 192.168.0.1, server: rahul286.rtcamp.info, request: "GET /
favicon.ico HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host:
"rahul286.rtcamp.info"

As I run php-fpm on port 9000 via TCP mode, I ran "netstat | grep
9000" and noticed something unusual...
tcp 1321 0 localhost:9000 localhost:46643
CLOSE_WAIT -
tcp 9 0 localhost:9000 localhost:36087
CLOSE_WAIT 14272/php5-fpm
tcp 1257 0 localhost:9000 localhost:46664
CLOSE_WAIT -
tcp 0 0 localhost:46666 localhost:9000
ESTABLISHED 12909/nginx: worker
tcp 9 0 localhost:9000 localhost:36100
CLOSE_WAIT 14276/php5-fpm
tcp 1321 0 localhost:9000 localhost:46629
CLOSE_WAIT -
tcp 9 0 localhost:9000 localhost:36106
CLOSE_WAIT 14275/php5-fpm
tcp 1257 0 localhost:9000 localhost:46656
CLOSE_WAIT -
tcp 9 0 localhost:9000 localhost:36091
CLOSE_WAIT 14277/php5-fpm
tcp 1321 0 localhost:9000 localhost:46625
CLOSE_WAIT -
tcp 1257 0 localhost:9000 localhost:46658
CLOSE_WAIT -
tcp 1321 0 localhost:9000 localhost:46641
CLOSE_WAIT -
tcp 0 0 localhost:46682 localhost:9000
ESTABLISHED 12909/nginx: worker
tcp 1321 0 localhost:9000 localhost:46633
CLOSE_WAIT -
tcp 1257 0 localhost:9000 localhost:36133
CLOSE_WAIT -
tcp 1336 0 localhost:9000 localhost:46676
ESTABLISHED -
tcp 1257 0 localhost:9000 localhost:36131
CLOSE_WAIT -
tcp 1257 0 localhost:9000 localhost:46660
CLOSE_WAIT -
tcp 1249 0 localhost:9000 localhost:36117
CLOSE_WAIT -
tcp 9 0 localhost:9000 localhost:36094
CLOSE_WAIT 14269/php5-fpm
tcp 0 0 localhost:46664 localhost:9000
FIN_WAIT2 -
tcp 1257 0 localhost:9000 localhost:36135
CLOSE_WAIT -
tcp 1257 0 localhost:9000 localhost:36125
CLOSE_WAIT -
tcp 9 0 localhost:9000 localhost:36102
CLOSE_WAIT 14268/php5-fpm
tcp 0 0 localhost:46662 localhost:9000
FIN_WAIT2 -
tcp 745 0 localhost:9000 localhost:46644
CLOSE_WAIT -
tcp 0 0 localhost:46658 localhost:9000
FIN_WAIT2 -
tcp 1265 0 localhost:9000 localhost:46607
CLOSE_WAIT -

........ (I truncated log so that it can be more readable)
It looks like php-fpm process(es) are sort of hanged - waiting
endlessly.

There are plenty of "CLOSE_WAIT" and kind of pairs as like below:
tcp 1337 0 localhost:9000 localhost:46680
CLOSE_WAIT -
tcp 0 0 localhost:46680 localhost:9000
FIN_WAIT2 -

Please note port 46680 in above.

I enabled mysql slow queries error log, but it didn't work.

As of now restarting php5-fpm every minute via a cronjob (see command
below) keeping everything running "smoothly" but I hate patchwork and
want to solve this...
1 * * * * service php5-fpm restart > /dev/null


I searched extensively on Google - got no help.
As mentioned, this a test-server in LAN, CPU load is never crossed
0.10 and memory usage is also below 25% (System has 2GB RAM and ubuntu-
server installed)
So if you find its time-confusing to help me out, please atleast drop
a hint.

Thanks in advance for help.
-Rahul

(please note this is reposting of - http://forum.nginx.org/read.php?2,127854)
2010/9/7 rahul286 <rahul286@gmail.com>:
> Hi All,
>
> After debugging for 6-hours - I am giving this up :|
>
> We have a nginx+php-fpm+mysql in LAN with almost 100 wordpress
> (created and used by different designers/developers all working on
> test wordpres setup)
>
> We are using nginx without any issues from long.
>
> Today, all of a sudden - nginx started returning "504 Gateway Time-
> out" out of the blue...
>
> I checked nginx error log for a virtual host...
> 2010/09/06 21:24:24 [error] 12909#0: *349 upstream timed out (110:
> Connection timed out) while reading response header from upstream,
> client: 192.168.0.1, server: rahul286.rtcamp.info, request: "GET /
> favicon.ico HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host:
> "rahul286.rtcamp.info"
> 2010/09/06 21:25:11 [error] 12909#0: *349 recv() failed (104:
> Connection reset by peer) while reading response header from upstream,
> client: 192.168.0.1, server: rahul286.rtcamp.info, request: "GET /
> favicon.ico HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host:
> "rahul286.rtcamp.info"
> 2010/09/06 21:25:11 [error] 12909#0: *443 recv() failed (104:
> Connection reset by peer) while reading response header from upstream,
> client: 192.168.0.1, server: rahul286.rtcamp.info, request: "GET /
> info.php HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host:
> "rahul286.rtcamp.info"
> 2010/09/06 21:25:12 [error] 12909#0: *443 connect() failed (111:
> Connection refused) while connecting to upstream, client: 192.168.0.1,
> server: rahul286.rtcamp.info, request: "GET /favicon.ico HTTP/1.1",
> upstream: "fastcgi://127.0.0.1:9000", host: "rahul286.rtcamp.info"
> 2010/09/06 22:08:32 [error] 12909#0: *1025 upstream timed out (110:
> Connection timed out) while reading response header from upstream,
> client: 192.168.0.1, server: rahul286.rtcamp.info, request: "GET /
> HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host:
> "rahul286.rtcamp.info"
> 2010/09/06 22:09:33 [error] 12909#0: *1025 upstream timed out (110:
> Connection timed out) while reading response header from upstream,
> client: 192.168.0.1, server: rahul286.rtcamp.info, request: "GET /
> favicon.ico HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host:
> "rahul286.rtcamp.info"
> 2010/09/06 22:09:40 [error] 12909#0: *1064 recv() failed (104:
> Connection reset by peer) while reading response header from upstream,
> client: 192.168.0.1, server: rahul286.rtcamp.info, request: "GET /
> info.php HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host:
> "rahul286.rtcamp.info"
> 2010/09/06 22:09:40 [error] 12909#0: *1064 connect() failed (111:
> Connection refused) while connecting to upstream, client: 192.168.0.1,
> server: rahul286.rtcamp.info, request: "GET /favicon.ico HTTP/1.1",
> upstream: "fastcgi://127.0.0.1:9000", host: "rahul286.rtcamp.info"
> 2010/09/06 22:24:44 [error] 12909#0: *1313 upstream timed out (110:
> Connection timed out) while reading response header from upstream,
> client: 192.168.0.1, server: rahul286.rtcamp.info, request: "GET /
> HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host:
> "rahul286.rtcamp.info"
> 2010/09/06 22:24:53 [error] 12909#0: *1313 recv() failed (104:
> Connection reset by peer) while reading response header from upstream,
> client: 192.168.0.1, server: rahul286.rtcamp.info, request: "GET /
> favicon.ico HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host:
> "rahul286.rtcamp.info"
>
> As I run php-fpm on port 9000 via TCP mode, I ran "netstat | grep
> 9000" and noticed something unusual...
> tcp     1321      0 localhost:9000          localhost:46643
> CLOSE_WAIT  -
> tcp        9      0 localhost:9000          localhost:36087
> CLOSE_WAIT  14272/php5-fpm
> tcp     1257      0 localhost:9000          localhost:46664
> CLOSE_WAIT  -
> tcp        0      0 localhost:46666         localhost:9000
> ESTABLISHED 12909/nginx: worker
> tcp        9      0 localhost:9000          localhost:36100
> CLOSE_WAIT  14276/php5-fpm
> tcp     1321      0 localhost:9000          localhost:46629
> CLOSE_WAIT  -
> tcp        9      0 localhost:9000          localhost:36106
> CLOSE_WAIT  14275/php5-fpm
> tcp     1257      0 localhost:9000          localhost:46656
> CLOSE_WAIT  -
> tcp        9      0 localhost:9000          localhost:36091
> CLOSE_WAIT  14277/php5-fpm
> tcp     1321      0 localhost:9000          localhost:46625
> CLOSE_WAIT  -
> tcp     1257      0 localhost:9000          localhost:46658
> CLOSE_WAIT  -
> tcp     1321      0 localhost:9000          localhost:46641
> CLOSE_WAIT  -
> tcp        0      0 localhost:46682         localhost:9000
> ESTABLISHED 12909/nginx: worker
> tcp     1321      0 localhost:9000          localhost:46633
> CLOSE_WAIT  -
> tcp     1257      0 localhost:9000          localhost:36133
> CLOSE_WAIT  -
> tcp     1336      0 localhost:9000          localhost:46676
> ESTABLISHED -
> tcp     1257      0 localhost:9000          localhost:36131
> CLOSE_WAIT  -
> tcp     1257      0 localhost:9000          localhost:46660
> CLOSE_WAIT  -
> tcp     1249      0 localhost:9000          localhost:36117
> CLOSE_WAIT  -
> tcp        9      0 localhost:9000          localhost:36094
> CLOSE_WAIT  14269/php5-fpm
> tcp        0      0 localhost:46664         localhost:9000
> FIN_WAIT2   -
> tcp     1257      0 localhost:9000          localhost:36135
> CLOSE_WAIT  -
> tcp     1257      0 localhost:9000          localhost:36125
> CLOSE_WAIT  -
> tcp        9      0 localhost:9000          localhost:36102
> CLOSE_WAIT  14268/php5-fpm
> tcp        0      0 localhost:46662         localhost:9000
> FIN_WAIT2   -
> tcp      745      0 localhost:9000          localhost:46644
> CLOSE_WAIT  -
> tcp        0      0 localhost:46658         localhost:9000
> FIN_WAIT2   -
> tcp     1265      0 localhost:9000          localhost:46607
> CLOSE_WAIT  -
>
> ....... (I truncated log so that it can be more readable)
> It looks like php-fpm process(es) are sort of hanged - waiting
> endlessly.
>
> There are plenty of "CLOSE_WAIT" and kind of pairs as like below:
> tcp     1337      0 localhost:9000          localhost:46680
> CLOSE_WAIT  -
> tcp        0      0 localhost:46680         localhost:9000
> FIN_WAIT2   -
>
> Please note port 46680 in above.
>
> I enabled mysql slow queries error log, but it didn't work.
>
> As of now restarting php5-fpm every minute via a cronjob (see command
> below) keeping everything running "smoothly" but I hate patchwork and
> want to solve this...
> 1 * * * * service php5-fpm restart > /dev/null

you meant every hour right ?

>
>
> I searched extensively on Google - got no help.
> As mentioned, this a test-server in LAN, CPU load is never crossed
> 0.10 and memory usage is also below 25% (System has 2GB RAM and ubuntu-
> server installed)
> So if you find its time-confusing to help me out, please atleast drop
> a hint.

you can first give us more informations about your configuration: PHP
version, nginx version, nginx conf, fpm conf ... (at least)

>
> Thanks in advance for help.
> -Rahul
>
> (please note this is reposting of - http://forum.nginx.org/read.php?2,127854)
>
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