Also, you'll need to put the LoadModule mod_vhost_limit directive BEFORE
YOUR VIRTUALHOSTS...
Olivier CHIROUZE
I&0 Infrastructure
Volvo Information Technology
> -----Original Message-----
> From: Chirouze Olivier
> Sent: 16 February 2007 16:03
> To: 'users@xxxxxxxxxxxxxxxx'
> Subject: RE: Trying to limit connections per virtual host
> with mod_cband [** FIXED with mod_vhost_limit **]
>
> Hi all.
>
> This is the full story with... FIX! :-)
>
> Let me try to make a good "googleable" summary (it took me so
> much time to sort this out, I'd be happy if someone finds it useful).
>
> The story begins like this: I was trying to limit the number
> of simultaneous connections per virtualhost on Apache 2.0.58
> running as a reverse proxy.
> 1) Apache doesn't allow to limit simultaneous connections per
> virtualhost (MaxClient only works at server level).
> 2) A few modules exist, but I never managed to have them
> working with [reverse] proxy. => they only worked when Apache
> is working as a web server.
>
> What I realized was quite simple, but so sad: the modules
> were called AFTER mod proxy. Which makes them useless!
>
> Thanks to the only answer I had on the forum (thanks a lot to
> Joshua Slive), I found solutions to change the order in which
> modules are called.
>
> I never managed to make mod_cband work (never managed to
> contact the developer either), but by hacking
> mod_vhost_limit, that finally worked.
>
> All modules register to Apache using the following function:
>
> static void register_hooks(apr_pool_t *p)
> {
> ap_hook_handler(vhost_limit_handler, NULL, NULL,
> APR_HOOK_REALLY_FIRST);//APR_HOOK_MIDDLE);
> ap_hook_post_config(vhost_limit_init, NULL, NULL,
> APR_HOOK_REALLY_FIRST);//APR_HOOK_MIDDLE);
> }
>
> Last parameter says "load this module somewhere". Changing
> APR_HOOK_MIDDLE to APR_HOOK_FIRST would have been too easy:
> mod_proxy allready says "I'm first" with this value!! Then I
> found the magic "APR_HOOK_REALLY_FIRST" that finally made the
> module loaded first. I guess next version of Apache will get
> the "APR_HOOK_REALLY_REALLY_FIRST" value, and so on :-)
>
> I can now limit the number of simultaneous connections per
> virtualhost, before they are forwarded to the webserver by mod proxy.
>
> I'm happy.
>
> Olivier
>
> PS: I will try to contact mod_vhost_limit creator to share
> the hacking. Open source rules ;-)
>
> Olivier CHIROUZE
> I&0 Infrastructure
> Volvo Information Technology
>
>
> > -----Original Message-----
> > From: Chirouze Olivier
> > Sent: 09 February 2007 17:08
> > To: 'users@xxxxxxxxxxxxxxxx'
> > Subject: Trying to limit connections per virtual host with mod_cband
> >
> > Hi,
> >
> > I'm trying to use mod_cband... but can't manage to!
> >
> > I've tailed down my conf file to the most simple case with
> > just one virtual host.
> > What I'm trying to achieve is quite simple: I just want to
> > limit the number of concurrent connections per virtual host
> > (a "MaxClient" at the virtualhost level) and I think this is
> > one of the many features of cband.
> >
> > How do I test this? Just call multiple times a page that
> > takes very long to anwser: during all this time, for each
> > click, a connection on this virtual host stays open on
> > Apache. (thanks a lot to Georgi Chorbadzhiyski for pointing
> > me to /status?notable that proves the connections are open on
> > the right virtual host).
> >
> > The thing is, on cband-status, I see some rps used, but never
> > a single connection! (thanks to cband status page:
> > /cband-status). "Current connection" always stays at 0. And,
> > in fact, the limit is never used. I set it to 2 and can have
> > more than 10 concurrent connections. So, in a word, it
> > doesn't work as expected.
> >
> > However, I see some "remote client", but always one. The
> > virtual host is correct, but "Connections Limit/Current"
> > always says "1/0". I don't understand how a line can be here
> > with zero connection?
> >
> > I'm kind of lost after looking around for days and trying all
> > I can think of (simplifying the config file, unactivating
> > modules, changing order of LoadModule, using OpenSta, etc...)
> >
> > I'm using mod_rewrite and mod_proxy and I think that might be
> > the pb. But there is an example with mod_rewrite on cband
> > homepage so I suppose there is no incompatibility!
> >
> > Please... Help ;-)
> >
> > Olivier
> >
> > Olivier CHIROUZE
> > I&0 Infrastructure
> >
> > The conf file:
> > --------------------------------------------------------------
> > ------------------------------------------
> >
> > ServerRoot /data/apache/httpd-test1
> >
> > # This only contains standard httpd.conf file with the
> > following modules activated:
> > #LoadModule access_module modules/mod_access.so
> > #LoadModule log_config_module modules/mod_log_config.so
> > #LoadModule logio_module modules/mod_logio.so
> > #LoadModule env_module modules/mod_env.so
> > #LoadModule setenvif_module modules/mod_setenvif.so
> > #LoadModule ssl_module modules/mod_ssl.so
> > #LoadModule mime_module modules/mod_mime.so
> > #LoadModule status_module modules/mod_status.so
> > #LoadModule negotiation_module modules/mod_negotiation.so
> > #LoadModule dir_module modules/mod_dir.so
> > #LoadModule alias_module modules/mod_alias.so
> > Include
> > /data/apache/httpd-test1/appli-apache/conf/httpd_solaris28.conf
> >
> > ServerName reverse-proxy-test2.iteu.volvo.net
> >
> > User apache
> > Group apache
> >
> > DocumentRoot "/data/apache/httpd-test1/htdocs"
> >
> > ServerAdmin apache@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> >
> > LoadModule cband_module choucroutemodules/mod_cband.so
> >
> > LoadModule proxy_module modules/mod_proxy.so
> >
> > LoadModule proxy_http_module modules/mod_proxy_http.so
> >
> > CustomLog /logs/apache/httpd-test1/logs/rproxy_log "%{Host}i
> > |%{RULE}e| %{%H/%T}t %h -> %{SERVER}e URL: %U"
> >
> > UseCanonicalName Off
> >
> > <VirtualHost reverse-proxy-test2.iteu.volvo.net:80>
> > <Location /status>
> > SetHandler server-status
> > Order deny,allow
> > Allow from all
> > </Location>
> > <Location /info>
> > SetHandler server-info
> > </Location>
> > </VirtualHost>
> >
> > LoadModule rewrite_module modules/mod_rewrite.so
> >
> > RewriteEngine on
> > RewriteLog /logs/apache/httpd-test1/logs/rewrite_log
> > RewriteLogLevel 0
> >
> > LogLevel debug
> >
> > Listen reverse-proxy-test2.iteu.volvo.net:80
> > NameVirtualHost reverse-proxy-test2.iteu.volvo.net:80
> >
> > <IfModule mod_cband.c>
> > <Location /cband-status>
> > SetHandler cband-status
> > Order deny,allow
> > Allow from all
> > </Location>
> > <Location /cband-status-me>
> > SetHandler cband-status-me
> > Order deny,allow
> > Allow from all
> > </Location>
> > </IfModule>
> >
> > <IfModule mod_cband.c>
> > CBandSpeed 0 0 10
> > CBandScoreFlushPeriod 1
> > CBandRandomPulse On
> > </IfModule>
> >
> > <VirtualHost reverse-proxy-test2.iteu.volvo.net:80>
> > ServerName youpi.volvo.net
> >
> > <IfModule mod_cband.c>
> > CBandRemoteSpeed 0 3 1
> > CBandSpeed 0 0 2
> > CBandDefaultExceededCode 503
> > CBandScoreboard /tmp/apache/scoreboard
> > CBandPeriod 2s
> > </IfModule>
> >
> > RewriteEngine on
> > RewriteLog /logs/apache/httpd-test1/logs/rewrite_log
> > RewriteLogLevel 3
> > Include conf/deny_patterns.conf
> >
> > RewriteRule ^/(.*)$
> http://10.213.131.69/waitZoub.php?wait=$1 [P]
> >
> > ProxyRequests off
> >
> > KeepAlive Off
> >
> > </VirtualHost>
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