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.
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