Steps to install Bugzilla on CentOS 5.4

1. Disable selinux
vi /etc/selinux/config
set SELINUX=disabled

2. Add one iptables rule to allow TCP port 80 for httpd
vi /etc/sysconfig/iptables
add following rule
-A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 80 -j ACCEPT
service iptables restart

3. Install required components
yum install perl
yum install httpd
yum install mysql-server
yum install mysql
yum install php-mysql
yum install gcc
yum install cvs
yum install patchutils
yum install mysql-devel

4. Install bugzilla
cd /var/www
rmdir html
wget http://ftp.mozilla.org/pub/mozilla.org/webtools/bugzilla-3.6.3.tar.gz
tar xzvf bugzilla-3.6.3.tar.gz
mv bugzilla-3.6.3 html

5. Apache configuration
vi /etc/httpd/conf/httpd.conf
find < directory "/var/www/html" > section and ..
1. Append ExecCGI to "Optoins"
2. Add "DirectoryIndex index.cgi index.html" under "Options"

Uncomment AddHandler cgi-script .cgi
service httpd start

6. Check if all the required perl modules are installed
./checksetup.pl --check-modules
to install all missing modules, run following command
perl install-module.pl --all
once doen, check modules again to see if it's ok
if DBD-mysql is not ok, run "perl install-module.pl DBD:mysql" to install it

7. Create localconfig
./checksetup.pl
modify the $db_pass of localconfig
vi ./localconfig
$db_pass = "howard"

8. Increase attachment size to 3MB, for example.
vi /etc/my.cnf
add "max_allowed_packet=3M"
service mysqld restart

9. Create mysql user
mysql -u root -p
GRANT SELECT, INSERT, UPDATE, DELETE, INDEX, ALTER, CREATE, LOCK TABLES, CREATE TEMPORARY TABLES, DROP, REFERENCES ON bugs.*TO bugs@localhost IDENTIFIED BY 'howard';
FLUSH PRIVILEGES;

10. Create bugzilla database and administrator account
run ./checksetup.pl and follow the instructions to create the administrator account
once done, run ./checksetup.pl again to make sure everything is ok

Now bugzilla should be ready to go, connect to it via browser and complete the one time setup.
That's all.

Notes:
. To fix "Error when close pipe to /usr/lib/sendmail (while creating account), you have to allow SMTP connection in SELinux by run "setsebool -P httpd_can_sendmail 1" without quotes.