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=head1 Appendix A: Downloading software and documentation
=head1 Coverage
Here you will find instructions for downloading the software and
its related documentation.
=head1 Perl
Perl is probably already installed on your machine, but you should at
least check the version you are using.  It is highly recommended that
you have at least Perl version 5.004.  You can get the latest perl
version from http://www.perl.com/ .  Try the direct download link
http://www.perl.com/pace/pub/perldocs/latest.html .  You can get Perl
documentation from the same location (although copious documentation
is included in the downloaded Perl distribution).
=head1 CPAN Downloads
You can download most of the Perl modules from CPAN.  There are many
mirrors of this site.  The main site's URL is http://cpan.org/.
You may want to search the Perl modules database by using
http://search.cpan.org/.
Either use the search form, or type in the name of the package the
module is distributed in. For example if you are looking for
C<Apache::DumpHeaders>, you can type:
http://search.cpan.org/search?dist=Apache-DumpHeaders .
=head1 Apache
Get the latest Apache webserver and documentation from
http://www.apache.org .  Try the direct download link
http://www.apache.org/dist/ .
=head1 mod_perl
Get the latest mod_perl sources and documentation from
http://perl.apache.org .  Try the direct download link
http://perl.apache.org/dist/ .
Source/Binary Distributions: http://perl.apache.org/distributions.html
Every Apache project rolls a new tar.gz snapshot of the latest CVS
version every 6 hours. You can grab the latest mod_perl CVS snapshot
from http://perl.apache.org/from-cvs/modperl/, all the mod_perl
related projects are available from http://perl.apache.org/from-cvs.
RPM: http://perl.apache.org/rpm/
Debian users will find Perl, Apache and mod_perl are available 
as .deb files on official image CDs or from the Debian web site 
http://www.debian.org .  The Debian distribution also contains 
many additional Perl and Apache libraries and modules. 
=head1 Squid - Internet Object Cache
http://squid.nlanr.net/
Squid Linux 2.x Redhat RPMs : http://home.earthlink.net/~intrep/linux/
=head1 thttpd - tiny/turbo/throttling HTTP server
http://www.acme.com/software/thttpd/
=head1 mod_throttle_access 
http://www.fremen.org/apache/mod_throttle_access.html
=head1 mod_proxy_add_forward
Ask Bjoern Hansen has written the C<mod_proxy_add_forward.c> module
for Apache that sets the C<X-Forwarded-For> field when doing a
ProxyPass, similar to what Squid does.  His module is available from
one of these URLs: http://modules.apache.org/search?id=124,
http://develooper.com/code/mpaf/mod_proxy_add_forward.c or
http://www.cpan.org/authors/id/ABH/mod_proxy_add_forward.c, complete
with instructions on how to compile it and whatnot.
=head1 httperf -- webserver Benchmarking tool
http://www.hpl.hp.com/personal/David_Mosberger/httperf.html
=head1 http_load -- another webserver Benchmarking tool
http://www.acme.com/software/http_load/
=head1 ab -- ApacheBench
ApacheBench comes with the Apache distribution.
=head1 Daquiri -- yet another webserver Benchmarking tool
should be available from the mod_backhand CVS tree:
http://www.backhand.org/mod_backhand/
=head1 High-Availability and Load Balancing Projects
=head2 mod_backhand -- Load Balancing for Apache
http://www.backhand.org/mod_backhand/
=head2 mod_redundancy
mod_redundancy is a module that works with Apache webserver. It
creates a Master/Slave Relationship between two physical
webservers. The Slave takes over the IP-Address(es) and the
Webservice(s) in case of a failure of the Master. One of the clues of
this solution is, that the Redundancy/Failover-Configuration is made
inside the Apache-Configfile.
The product is neither OSS, nor free :(
The homepage of mod_redundancy is http://www.ask-the-guru.com .
=head2 High-Availability Linux Project
You will find the definitive guide to load balancing techniques 
at the High-Availability Linux Project site --
http://www.henge.com/~alanr/ha/
=head2 lbnamed - a Load Balancing Name Server Written in Perl
http://www.stanford.edu/~riepel/lbnamed/
http://www.stanford.edu/~riepel/lbnamed/bof.talk/
http://www.stanford.edu/~schemers/docs/lbnamed/lbnamed.html
=head2 Network Address Translation and Networks: Virtual Servers (Load Balancing)
http://www.csn.tu-chemnitz.de/~mha/linux-ip-nat/diplom/node4.html#SECTION00043100000000000000
=head2 Linux Virtual Server Project
http://www.linuxvirtualserver.org/
=head2 Efficient Support for P-HTTP in Cluster-Based Web Servers
(with Mohit Aron and Willy Zwaenepoel.) In Proceedings of the USENIX
1999 Annual Technical Conference, Monterey, CA, June 1999.
http://www.cs.rice.edu/~druschel/usenix99lard.ps.gz
http://www.usenix.org/publications/library/proceedings/usenix99/full_papers/aron/aron_html/index.html
=head2 IP Filter
The latest ip filter includes some simple load balancing code, that
allows a round-robin distribution onto several machines via
ipnat. That may be a simple solution for a few specific load problem.
http://coombs.anu.edu.au/~avalon/ipf3.4beta3.tgz
=head1 Apache::Request
The package name is I<libapreq>.
Get it from your favorite CPAN mirror at $CPAN/authors/id/DOUGM/ or
from http://perl.apache.org/dist/.
=head1 DataBases
Low-Cost Unix Database Differences
http://www.toodarkpark.org/computers/dbs.html
My collection of various links to databases implementations
http://stason.org/TULARC/webmaster/db.html
=head1 libgtop
LibGTop is a library that fetches system related information such as
CPU Load, Memory Usage and information about running processes. The
module C<GTop> provides a Perl interface to this library.
http://home-of-linux.org/gnome/libgtop/
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