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From Rainer Jung <rainer.j...@kippdata.de>
Subject Re: [users@httpd] AJP proxy timeout problem
Date Sat, 29 Oct 2011 09:43:06 GMT
On 29.10.2011 10:21, SpliFF wrote:
> 2.2.20 running on Gentoo 64-bit.
> 
> Server version: Apache/2.2.20 (Unix)
> Server built:   Sep 22 2011 02:42:57
> Server's Module Magic Number: 20051115:28
> Server loaded:  APR 1.4.5, APR-Util 1.3.12
> Compiled using: APR 1.4.5, APR-Util 1.3.12
> Architecture:   64-bit
> Server MPM:     Worker
>   threaded:     yes (fixed thread count)
>     forked:     yes (variable process count)
> Server compiled with....
>  -D APACHE_MPM_DIR="server/mpm/worker"
>  -D APR_HAS_SENDFILE
>  -D APR_HAS_MMAP
>  -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
>  -D APR_USE_SYSVSEM_SERIALIZE
>  -D APR_USE_PTHREAD_SERIALIZE
>  -D APR_HAS_OTHER_CHILD
>  -D AP_HAVE_RELIABLE_PIPED_LOGS
>  -D DYNAMIC_MODULE_LIMIT=128
>  -D HTTPD_ROOT="/usr"
>  -D SUEXEC_BIN="/usr/sbin/suexec"
>  -D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
>  -D DEFAULT_ERRORLOG="logs/error_log"
>  -D AP_TYPES_CONFIG_FILE="/etc/apache2/mime.types"
>  -D SERVER_CONFIG_FILE="/etc/apache2/httpd.conf"
> 
> 
> On 28/10/11 19:16, Rainer Jung wrote:
>> Which version of httpd?
>>
>> On 28.10.2011 08:49, SpliFF wrote:
>>> I've having an issue where a long-running backend script behind AJP is causing
apache to error with "Service Temporarily
>>> Unavailable" after exactly 5 minutes.
>>>
>>> I tried to solve this by moving from mod_rewrite to mod_proxy, with the following
configuration:
>>>
>>>     # Search Engine Safe URL rewrite
>>>     # Redirect Coldfusion requests to index.cfm
>>>     # matches /file.mp4 but not /file:name.mp4 (ie; is a real file)
>>>     RewriteCond %{REQUEST_FILENAME} !/[^/:]+\.[^/:]{2,5}$
>>>     RewriteRule (.*) /index.cfm$1 [PT]
>>>
>>>     # Proxy CFML files to Jetty via AJP connector
>>>     <Proxy *>
>>>     Allow from 127.0.0.1
>>>     </Proxy>
>>>     ProxyPreserveHost On
>>>     ProxyRequests Off
>>>     ProxyPassMatch ^/(.+\.cf[cm])(/.*)?$ ajp://localhost:8009/$1$2 connectiontimeout=6000
timeout=6000
>>>
>>>
>>> If I'm not mistaken those timeouts are in seconds so AJP should be waiting at
least 100 minutes.
>>>
>>> I also made sure the Railo backend would wait long enough, using the following
CFML tag:
>>>
>>> <cfsetting requesttimeout=6000 />
>>>
>>> I checked the Jetty (Application server) config but there doesn't seem to be
any timeout options.
>>>
>>> The apache error log (with debugging) says:
>>>
>>> [Fri Oct 28 15:28:45 2011] [debug] mod_proxy_ajp.c(45): proxy: AJP: canonicalising
URL
>>> //localhost:8009/index.cfm/subscribers/importold
>>> [Fri Oct 28 15:28:45 2011] [debug] proxy_util.c(1525): [client 192.168.1.60]
proxy: *: found reverse proxy worker for
>>> ajp://localhost:8009/index.cfm/subscribers/importold
>>> [Fri Oct 28 15:28:45 2011] [debug] mod_proxy.c(1015): Running scheme ajp handler
(attempt 0)
>>> [Fri Oct 28 15:28:45 2011] [debug] mod_proxy_ajp.c(659): proxy: AJP: serving
URL
>>> ajp://localhost:8009/index.cfm/subscribers/importold
>>> [Fri Oct 28 15:28:45 2011] [debug] proxy_util.c(2011): proxy: AJP: has acquired
connection for (*)
>>> [Fri Oct 28 15:28:45 2011] [debug] proxy_util.c(2067): proxy: connecting
>>> ajp://localhost:8009/index.cfm/subscribers/importold to localhost:8009
>>> [Fri Oct 28 15:28:45 2011] [debug] proxy_util.c(2193): proxy: connected /index.cfm/subscribers/importold
to localhost:8009
>>> [Fri Oct 28 15:28:45 2011] [debug] proxy_util.c(2444): proxy: AJP: fam 2 socket
created to connect to *
>>> [Fri Oct 28 15:28:45 2011] [debug] ajp_header.c(224): Into ajp_marshal_into_msgb
>>> [Fri Oct 28 15:28:45 2011] [debug] ajp_header.c(290): ajp_marshal_into_msgb:
Header[0] [Host] =
>>> [users.arcmail.betamax.arc.net.au]
>>> [Fri Oct 28 15:28:45 2011] [debug] ajp_header.c(290): ajp_marshal_into_msgb:
Header[1] [User-Agent] = [Mozilla/5.0 (X11;
>>> Linux x86_64; rv:7.0.1) Gecko/20100101 Firefox/7.0.1]
>>> [Fri Oct 28 15:28:45 2011] [debug] ajp_header.c(290): ajp_marshal_into_msgb:
Header[2] [Accept] =
>>> [text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
>>> [Fri Oct 28 15:28:45 2011] [debug] ajp_header.c(290): ajp_marshal_into_msgb:
Header[3] [Accept-Language] = [en-us,en;q=0.5]
>>> [Fri Oct 28 15:28:45 2011] [debug] ajp_header.c(290): ajp_marshal_into_msgb:
Header[4] [Accept-Encoding] = [gzip, deflate]
>>> [Fri Oct 28 15:28:45 2011] [debug] ajp_header.c(290): ajp_marshal_into_msgb:
Header[5] [Accept-Charset] =
>>> [ISO-8859-1,utf-8;q=0.7,*;q=0.7]
>>> [Fri Oct 28 15:28:45 2011] [debug] ajp_header.c(290): ajp_marshal_into_msgb:
Header[6] [DNT] = [1]
>>> [Fri Oct 28 15:28:45 2011] [debug] ajp_header.c(290): ajp_marshal_into_msgb:
Header[7] [Connection] = [keep-alive]
>>> [Fri Oct 28 15:28:45 2011] [debug] ajp_header.c(290): ajp_marshal_into_msgb:
Header[8] [Cookie] =
>>> [CFID=d5b4b21d-bea4-4875-b2f3-7dc003c7fa64; CFTOKEN=0; FW_BUGZ=; RAILO_ADMIN_LANG=en;
RAILO_ADMIN_LASTPAGE=server.cache]
>>> [Fri Oct 28 15:28:45 2011] [debug] ajp_header.c(450): ajp_marshal_into_msgb:
Done
>>> [Fri Oct 28 15:28:45 2011] [debug] mod_proxy_ajp.c(265): proxy: APR_BUCKET_IS_EOS
>>> [Fri Oct 28 15:28:45 2011] [debug] mod_proxy_ajp.c(270): proxy: data to read
(max 8186 at 4)
>>> [Fri Oct 28 15:28:45 2011] [debug] mod_proxy_ajp.c(285): proxy: got 0 bytes of
data
>>> [Fri Oct 28 15:28:46 2011] [debug] ajp_header.c(687): ajp_read_header: ajp_ilink_received
06
>>> [Fri Oct 28 15:28:46 2011] [debug] ajp_header.c(697): ajp_parse_type: got 06
>>> [Fri Oct 28 15:33:46 2011] [error] ajp_read_header: ajp_ilink_receive failed
>>> [Fri Oct 28 15:33:46 2011] [debug] mod_proxy_ajp.c(531): (120006)APR does not
understand this error code:
>>> ajp_read_header failed
>>> [Fri Oct 28 15:33:46 2011] [debug] mod_proxy_ajp.c(546): proxy: Processing of
request failed backend: 1, output: 0
>>> [Fri Oct 28 15:33:46 2011] [error] (120006)APR does not understand this error
code: proxy: dialog to (null) (*) failed
>>> [Fri Oct 28 15:33:46 2011] [debug] proxy_util.c(2029): proxy: AJP: has released
connection for (*)
>>>
>>> Note the delay between "ajp_parse_type: got 06" and "ajp_ilink_receive failed"
is 5 minutes accurate to the second. I
>>> read somewhere that 5 minutes is the default timeout for mod_proxy so my suspicion
is the timeout settings are being
>>> ignored. The only other theory I have is that the [PT] flag on the first rewrite
rule is causing those values to be ignored.

Did you truncate the log output? There seems to be helpful lines missing.

In addition: what kind of inf did you relace by "*"? It is fine to
replace confidential info, but in some places I would have just expected
something like "localhost" where you put "*". So I wonder whether there
are other proxy workers defined in the configuration apart from the ones
you have shown us?

I checked the code again, mod_proxy_ajp.c constructs the connection
using ap_proxy_connect_backend() which explicitely uses the worker
timeouts if set and only falls back to the proxy or server timeouts if
no worker timeout is set.

Regards,

Rainer

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