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=head2 Optional Dependencies and Asynchronous IO

It is very highly recommended that L<Perlbal::XS::HTTPHeaders> is installed and enabled. If you have poor performance, the first thing to do is install L<Perlbal::XS::HTTPHeaders>.

    $ perl -MCPAN -e shell

    cpan> install Perlbal::XS::HTTPHeaders

Enable it in your configuration:

    XS enable headers

Perlbal checks for L<IO::AIO> availability and uses it to perform asynchronous IO operations. If you're performing disk operations (e.g., using Perlbal as a web server), having L<IO::AIO> will improve your response times.

The only thing required in order to benefit from this feature is to install L<IO::AIO>:

    $ perl -MCPAN -e shell

    cpan> install IO::AIO

If you don't have L<IO::AIO> installed a warning message will be displayed when you start perlbal:

    WARNING:  AIO mode disabled or not available.
              Perlbal will run slowly under load if you're doing any
              disk operations. (e.g. web_server mode).
              Install IO::AIO for better performance.


=head2 Checking that Perlbal is succesfully installed

Perlbal is shipped with some sample configuration files that reside in the F<conf> directory (of the source).

You can give Perlbal a try by heading to the directory where the source is and using the following command:

    $ sudo perlbal -c conf/webserver.conf

By pointing your browser at C<localhost:80> you should now see Perlbal responding (showing you the contents of C</usr/share/doc>).

Note that the F<webserver.conf> file sets up a Perlbal web server that listens on port 80. If you already have something listening on port 80 you need to either stop that service or change the port number on F<webserver.conf>.

Also note that if your machine doesn't have a C</usr/share/docs> directory you'll see an C<ERROR: Directory not found for service docs> error message. Change the directory in the configuration file to something that exists.


=head2 Troubleshooting

=head3 Prerequisites not found

If you're installing Perlbal by hand you may encounter some error messages describing how some prerequisites are not available:

    user@machine:~/Perlbal-X.XX$ perl Makefile.PL
    Checking if your kit is complete...
    Looks good
    Warning: prerequisite BSD::Resource 0 not found.
    Warning: prerequisite Danga::Socket 1.44 not found.
    Warning: prerequisite HTTP::Date 0 not found.
    Warning: prerequisite HTTP::Response 0 not found.
    Warning: prerequisite Sys::Syscall 0 not found.
    Writing Makefile for Perlbal

This is perl's way of telling you that since you're installing Perlbal by hand you'll also need to install its prerequisites by hand. Your first choice is to download each of them separately and perform the same installation procedure for each. Unfor...

Alternately, see the following Troubleshooting item: C<No connection to the internet>.


=head3 No connection to the internet

If you don't have a connection to the internet you can still install Perlbal, but you'll have to tranfer the source somehow to the machine.

Given that Perlbal has other module dependencies from CPAN (and those have their own dependencies too), here's a solution for this problem:


Step 1: On a machine with connection to the internet, install CPAN::Mini:

    $ perl -MCPAN -e shell

    cpan> install CPAN::Mini

Run C<minicpan> to create a minimal CPAN mirror (it contains only the latest version of each module):

    $ minicpan -l /home/user/minicpan/ -r http://cpan.org/

Now grab that directory and record it to something you can read on the other machine (e.g., a DVD, a hard drive).

Once you're on that machine, you can run the CPAN shell and tell it to look for distributions on the local directory where you now have your own CPAN mirror:

    $ perl -MCPAN -e shell

    cpan> o conf urllist push file:///home/user/path/to/minicpan

    cpan> install Perlbal

If you want C<cpan> to record this change don't forget to commit:

    cpan> o conf commit


=head3 No compiler available

If there's no compiler available on the machine you will probably see an error ending in something like:

    Failed during this command:
     DORMANDO/Perlbal-X.XX.tar.gz : writemakefile NO '/usr/bin/perl Makefile.PL INSTALLDIRS=site' returned status -1

You need to install something like C<gcc> (check L<http://gcc.gnu.org/>).

After installing C<gcc>, when trying to install Perlbal again you may get another error message:

    cpan> install Perlbal
    Running install for module 'Perlbal'
    Running make for D/DO/DORMANDO/Perlbal-X.XX.tar.gz
      Has already been unwrapped into directory /home/myself/.cpan/build/Perlbal-X.XX-GFko0J
      '/usr/bin/perl Makefile.PL INSTALLDIRS=site' returned status -1, won't make
    Running make test
      Make had some problems, won't test
    Running make install
      Make had some problems, won't install

This is the cpan shell assuming nothing changed in the system and skipping a few steps. You need to let it know you're willing to forget the past:

    cpan> look Perlbal