Advanced Webserver Setup for WebGUI. WebGUI User Conference Chicago, October 2004 Leendert Bottelberghs, United Knowledge

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1 Advanced Webserver Setup for WebGUI WebGUI User Conference Chicago, October 2004 Leendert Bottelberghs, United Knowledge

2 Overview the WebGUI request Apache Server Serving Content Load Balancing Apache Proxy WebGUI Webserver

3 The WebGUI Request: what happens browser - server communication WebGUI::Page one request generates multiple

4 What happens with a WebGUI request? client/browser WebGUI Request server WG::Page return HTML

5 What happens with a WebGUI request? client/browser server WebGUI Request WG::Page WebGUI start session process operations process functions generate page return HTML

6 What happens with a WebGUI request? client/browser WebGUI Request render HTML server WG::Page return HTML

7 What happens with a WebGUI request? client/browser WebGUI Request render HTML server WG::Page return HTML <html> <link rel= stylesheet href= > <body> <img src= >.... </body> </html>

8 What happens with a WebGUI request? client/browser WebGUI Request render HTML file Request interpret file server WG::Page retrieve file return HTML return file

9 Apache Server: outlines Server Pool Min, Max & Spare Serving Content CGI vs mod_perl

10 Apache Server httpd httpd = busy = waiting main httpd process controls Server Pool httpd httpd httpd httpd httpd httpd httpd httpd httpd

11 Apache Server: pre-forking Configuration directives: MinSpareServers MaxSpareServers MaxClients Server Pool busy min spare max spare max clients

12 Serving Content internet client webserver HTTPD Process application? compi le yes no retriev e file execu te return respo nse compile cgi: on-the-fly mod_perl: at Apache startup

13 CGI vs mod_perl 1

14 Load balancing principles: distribute requests over different servers using WebGUI.conf using a Reverse Proxy Server

15 Balancing the load internet client application request file request Apache mod_perl Server lightweight webserver Use WebGUI.conf: uploadsurl= extrasurl=

16 Load balancing: advantages no unnecessary use of resources more processes available for static file requests -> faster serving ability to use different *physical* servers better performance

17 Load balancing with WebGUI.conf: drawbacks different hosts (URLs) for pages and static content; causes javascript security violations Apache/mod_perl suffers from client connection speed solution: Reverse Proxy Server

18 Using a Reverse Proxy Server internet client application request request Reverse Proxy Server file request URI translation Apache/mod_perl Server lightweight webserver

19 Reverse Proxy Server example internet client application request request file request port: 80 port: 3001 port: 3002 Reverse Proxy URI translation: if(/uploads/) -> if(/extras/) -> else ->

translation: if(/uploads/) -> http://mycompany.

20 Setup Apache as Proxy basic Apache modules examples combining Reverse Proxy and Static Content Servers

21 Using Apache as Proxy Server Modules: mod_rewrite -> URI translation mod_proxy -> reverse proxy request to different servers

22 Using Apache as Proxy Server Example httpd.conf - using different ports RewriteEngine on RewriteRule ^/uploads/(.*)$ to://%{http_host}:3002/uploads/$1 [S=2] RewriteRule ^/extras/(.*)$ to://%{http_host}:3002/extras/$1 [S=1] RewriteRule ^/(.*)$ to://%{http_host}:3001/$1 RewriteRule ^to://([^/])+/(.*) [E=SERVER:$1,P,L] RewriteRule.* - [F] ProxyRequests Off ProxyPassReverse /

23 Using Apache as Proxy Server Example 2 httpd.conf - using RewriteMap RewriteEngine on RewriteMap static txt:/some/location/static-servers.map RewriteMap dynamic txt:/some/location/dynamic-servers.map RewriteRule ^/uploads/(.*)$ to://${static:%{http_host}}/uploads/$1 [S=2] RewriteRule ^/extras/(.*)$ to://${static:%{http_host}}/extras/$1 [S=1] RewriteRule ^/(.*)$ to://${dynamic:%{http_host}}/$1 RewriteRule ^to://([^/])+/(.*) [E=SERVER:$1,P,L] RewriteRule.* - [F] ProxyRequests Off ProxyPassReverse /

24 Using Apache as Proxy Server Example 2 static-servers.map mycompany.com webgui.com mycompany.com:3001 static.webgui.com dynamic-servers.map mycompany.com webgui.com mycompany.com:3002 dynamic.webgui.com

25 Reverse Proxy & static content Servers Combined internet client request application request Reverse Proxy / static content Server FS file request Apache/mod_perl Server

26 RProxy & SC Server combined: Example httpd.conf RewriteEngine on RewriteMap dynamic txt:/some/location/dynamic-servers.map RewriteCond %{REQUEST_URI} ^/(uploads extras)/ RewriteRule ^/(.*)$ /home/public/%{http_host}/www/$1 [E=SERVER:%{HTTP_HOST}, L] RewriteCond %{REQUEST_URI}!^/(uploads extras)/ RewriteRule ^/(.*)$ to://${dynamic:%{http_host}}/$1 RewriteRule ^to://([^/])+/(.*) [E=SERVER:$1,P,L] RewriteRule.* - [F]

27 Advanced Webserver Setups for WebGUI a mod_perl handler for serving WebGUI requests Apache::WebGUI library flexible & scalable WebGUI Server

28 WebGUI without VHosts httpd.conf <Location /webgui-request> SetHandler perl-script PerlHandler Apache::WebGUI::Request </Location> Apache::WebGUI::Request sub handler { 1 my $r = shift; 2 my $configfile = _getconfig($r); 3 my $webguiroot = $r->dir_config( webguiroot ); 4 my $location = $r->location; 5 $ENV{'PATH_INFO'} = $ENV{'REQUEST_URI'}; 6 $ENV{'PATH_INFO'} =~ s/^$location(\/\w*)(\?.*)?$/$1/; 7 print WebGUI::page($webguiRoot, $configfile); 8 return OK; }

29 Building a Webserver System for WebGUI internet client request WebGUI RProxy / SC Server WebGUI Request Servers Apache::WebGUI filter & mapping System

30 Apache::WebGUI Library 1

31 Fully Flexible & Scalable WebGUI Server System internet client WebGUI RProxy / SC Server FS FS FS WebGUI Site Administration System WebGUI Request Servers Database Servers

32 Questions?

33 Drinks?

The course will be run on a Linux platform, but it is suitable for all UNIX based deployments.

The course will be run on a Linux platform, but it is suitable for all UNIX based deployments. Linux Apache Web Server Administration Course Description: The Linux Apache Web Server Administration course is aimed at technical staff who will be responsible for installing, configuring and maintaining