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1) yum update then reboot

2) Setup -> Firewall -> disable Security Level and SELinux

3) Disable the following services and then reboot...

apmd
bluetooth
cups
hidd
ip6tables
iptables
netfs
nfslock
pcscd
portmap

4) Add RPM Forge REPO

rpm -Uhv http://apt.sw.be/redhat/el5/en/i386/rpmforge/RPMS/rpmforge-release-0.3.6-1.el5.rf.i386.rpm

5) Install software needed for ZM Installation:

yum -y install mysql mysql-server mysql-devel php php-gd php-mysql httpd gcc pcre-devel gd mod_ssl glib2-devel gcc-c++ ntp gnutls-devel ImageMagick libjpeg-devel perl-Archive-Tar perl-MIME-Lite perl-MIME-tools perl-Date-Manip perl-LWP-UserAgent-Determined perl-PHP-Serialization perl-Device-SerialPort perl-Archive-Zip perl-Sys-Mmap.i386 perl-Module-Load subversion git screen yasm

6) Confirm installation and then reboot.

7) Install ffmpeg

rpm -Uvh http://apt.sw.be/redhat/el5/en/i386/rpmforge/RPMS/rpmforge-release-0.5.1-1.el5.rf.i386.rpm
yum install ffmpeg ffmpeg-devel

8) Turn on services:

chkconfig httpd on
chkconfig mysqld on
chkconfig ntpd on
ntpdate pool.ntp.org
service httpd start
service mysqld start
service ntpd start

9) Setup your MySQL:

/usr/bin/mysql_secure_installation

10) Download and extract ZM files:

cd /root
wget http://www2.zoneminder.com/downloads/ZoneMinder-1.24.2.tar.gz
wget http://www.zoneminder.com/fileadmin/downloads/cambozola.jar
tar -zxvf ZoneMinder-1.24.2.tar.gz
cd ZoneMinder-1.24.2

11) Install

CXXFLAGS=-D__STDC_CONSTANT_MACROS ./configure --with-webdir=/var/www/html/zm --with-cgidir=/var/www/cgi-bin --with-webuser=apache --with-webgroup=apache ZM_DB_HOST=localhost ZM_DB_NAME=zm ZM_DB_USER=zmuser ZM_DB_PASS=yourpassword
make
make install

12) MySQL Preparation:

mysql -u root -p
create database zm;
grant all on zm.* to zmuser@localhost identified by 'yourpassword';
flush privileges;
exit

13) Import the Database:

cd /root/ZoneMinder-1.24.2
mysql -u root -p zm < db/zm_create.sql

14) Finale

cp scripts/zm /etc/init.d/
chmod +x /etc/init.d/zm
chkconfig zm on
cd ..
cp cambozola.jar /var/www/html/zm/
chown apache:apache /var/www/html/zm/cambozola.jar
service zm start

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and you're done! kindly check the wiki / documentation for option properties. adding cams, adjusting this and such..