Re : [users@httpd] Re : [users@httpd] proxy_loadbalancer and failover

[michael bienstein <mbienstein@xxxxxxxx>]

Here's the error.log snippet for sending my Chrome browser to http://localhost:8081/qlikview

The first request gets sent to 127.0.0.1:80 and works. It is a redirect to /qlikview/index.htm.

The second request gets sent to 127.0.0.1:81. This says that it acquired a connection which can't be true. The existing socket is then forcibly closed by remote host OS 10054. Now I have run netstat -ab and nothing is listening on port 81. So it is really strange. In any case, my Apache sends back the 502 because of this. Then there is a request for the favicon which fails because it isn't mapped to anything.

So what is that OS 10054 and how to fix it?

Michael

---

[Fri Aug 20 10:49:32 2010] [debug] mod_proxy_balancer.c(46): proxy: BALANCER: canonicalising URL //mycluster/qlikview

[Fri Aug 20 10:49:32 2010] [debug] mod_proxy_balancer.c(1003): proxy: Entering byrequests for BALANCER (balancer://mycluster)

[Fri Aug 20 10:49:32 2010] [debug] mod_proxy_balancer.c(1046): proxy: byrequests selected worker "http://127.0.0.1" : busy 0 : lbstatus 0

[Fri Aug 20 10:49:32 2010] [debug] mod_proxy_balancer.c(581): proxy: BALANCER (balancer://mycluster) worker (http://127.0.0.1) rewritten to http://127.0.0.1/qlikview

[Fri Aug 20 10:49:32 2010] [debug] mod_proxy.c(993): Running scheme balancer handler (attempt 0)

[Fri Aug 20 10:49:32 2010] [debug] mod_proxy_http.c(1966): proxy: HTTP: serving URL http://127.0.0.1/qlikview

[Fri Aug 20 10:49:32 2010] [debug] proxy_util.c(2011): proxy: HTTP: has acquired connection for (127.0.0.1)

[Fri Aug 20 10:49:32 2010] [debug] proxy_util.c(2067): proxy: connecting http://127.0.0.1/qlikview to 127.0.0.1:80

[Fri Aug 20 10:49:32 2010] [debug] proxy_util.c(2193): proxy: connected /qlikview to 127.0.0.1:80

[Fri Aug 20 10:49:32 2010] [debug] proxy_util.c(2444): proxy: HTTP: fam 2 socket created to connect to 127.0.0.1

[Fri Aug 20 10:49:32 2010] [debug] proxy_util.c(2576): proxy: HTTP: connection complete to 127.0.0.1:80 (127.0.0.1)

[Fri Aug 20 10:49:32 2010] [debug] mod_proxy_http.c(1736): proxy: start body send

[Fri Aug 20 10:49:32 2010] [debug] mod_proxy_http.c(1840): proxy: end body send

[Fri Aug 20 10:49:32 2010] [debug] proxy_util.c(2029): proxy: HTTP: has released connection for (127.0.0.1)

[Fri Aug 20 10:49:32 2010] [debug] mod_proxy_balancer.c(46): proxy: BALANCER: canonicalising URL //mycluster/qlikview/index.htm

[Fri Aug 20 10:49:32 2010] [debug] mod_proxy_balancer.c(1003): proxy: Entering byrequests for BALANCER (balancer://mycluster)

[Fri Aug 20 10:49:32 2010] [debug] mod_proxy_balancer.c(1046): proxy: byrequests selected worker "http://127.0.0.1:81" : busy 0 : lbstatus 10

[Fri Aug 20 10:49:32 2010] [debug] mod_proxy_balancer.c(581): proxy: BALANCER (balancer://mycluster) worker (http://127.0.0.1:81) rewritten to http://127.0.0.1:81/qlikview/index.htm

[Fri Aug 20 10:49:32 2010] [debug] mod_proxy.c(993): Running scheme balancer handler (attempt 0)

[Fri Aug 20 10:49:32 2010] [debug] mod_proxy_http.c(1966): proxy: HTTP: serving URL http://127.0.0.1:81/qlikview/index.htm

[Fri Aug 20 10:49:32 2010] [debug] proxy_util.c(2011): proxy: HTTP: has acquired connection for (127.0.0.1)

[Fri Aug 20 10:49:32 2010] [debug] proxy_util.c(2067): proxy: connecting http://127.0.0.1:81/qlikview/index.htm to 127.0.0.1:81

[Fri Aug 20 10:49:32 2010] [debug] proxy_util.c(2193): proxy: connected /qlikview/index.htm to 127.0.0.1:81

[Fri Aug 20 10:49:32 2010] [debug] proxy_util.c(2444): proxy: HTTP: fam 2 socket created to connect to 127.0.0.1

[Fri Aug 20 10:49:32 2010] [debug] proxy_util.c(2576): proxy: HTTP: connection complete to 127.0.0.1:81 (127.0.0.1)

[Fri Aug 20 10:49:33 2010] [error] [client 127.0.0.1] (OS 10054)An existing connection was forcibly closed by the remote host.  : proxy: error reading status line from remote server 127.0.0.1:81

[Fri Aug 20 10:49:33 2010] [debug] mod_proxy_http.c(1458): [client 127.0.0.1] proxy: NOT Closing connection to client although reading from backend server 127.0.0.1:81 failed.

[Fri Aug 20 10:49:33 2010] [error] [client 127.0.0.1] proxy: Error reading from remote server returned by /qlikview/index.htm

[Fri Aug 20 10:49:33 2010] [debug] proxy_util.c(2029): proxy: HTTP: has released connection for (127.0.0.1)

[Fri Aug 20 10:49:34 2010] [error] [client 127.0.0.1] File does not exist: C:/Program Files (x86)/Apache Software Foundation/Apache2.2/htdocs/favicon.ico

---

De : Rainer Jung <rainer.jung@xxxxxxxxxxx>
À : users@xxxxxxxxxxxxxxxx
Envoyé le : Jeu 19 août 2010, 17h 58min 40s
Objet : Re: Re : [users@httpd] proxy_loadbalancer and failover

On 19.08.2010 16:44, michael bienstein wrote:
> Hi,
>
> Thanks for the help. I have a IIS listening on port 80 and nothing on
> port 81.
>
> Version is Apache/2.2.16 (Win32)
> Server Built: Jul 30 2010 16:15:37
>
> Here's the changes I've made to the httpd.config from the default install:
> httpd.config
>
> Listen 8081
>
> #Used in other tests (sticky session cookie writing)
> LoadModule headers_module modules/mod_headers.so
> #Used for this test
> LoadModule proxy_module modules/mod_proxy.so
> LoadModule proxy_balancer_module modules/mod_proxy_balancer.so
> LoadModule proxy_connect_module modules/mod_proxy_connect.so

You likely don't need to activate mod_proxy_connect. At least you don't
allow the CONNECT method in the config below.

> LoadModule proxy_http_module modules/mod_proxy_http.so
> #Used in other tests (sticky session tests)
> LoadModule setenvif_module modules/mod_setenvif.so
> #For seeing the scoreboard
> LoadModule status_module modules/mod_status.so
>
> ProxyRequests Off
> <Proxy balancer://mycluster>
> BalancerMember http://127.0.0.1:80 loadfactor=10
> BalancerMember http://127.0.0.1:81 loadfactor=10
> </Proxy>
> ProxyPassMatch (?i)^/qlikview(.*) balancer://mycluster/qlikview$1
> ProxyPassMatch (?i)^/qvajaxzfc/(.*) balancer://mycluster/qvajaxzfc/$1
> ProxyPassMatch (?i)^/qvprint/(.*) balancer://mycluster/qvprint/$1
> ProxyPassReverse /qlikview balancer://mycluster/qlikview
> ProxyPassReverse /qvajaxzfc/ balancer://mycluster/qvajaxzfc/
> ProxyPassReverse /qvprint/ balancer://mycluster/qvprint/
> <Location /balancer-manager>
> SetHandler balancer-manager
> </Location>

Looks OK as a basic configuration.

If the port 81 doesn't listen, then the request should fail earlier than
the error message you showed. Maybe it does fail over to port 80 and we
get the error there.

Could you please increase your LogLevel to "debug" and provide the error
log snippet?

Regards,

Rainer

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