Install KnowledgeTree in Cent OS

Note that these steps should be performed as root.

1) Install OpenOffice.org 2.4
a) Download the OpenOffice.org RPM from the OpenOffice.org website
http://download.openoffice.org/2.4.3/other.html

b) Untar the OpenOffice.org package

$ tar -xf OpenOffice.org.tar.gz

c) Run the OpenOffice.org RPM file

$ cd /RPMS
$ rpm -i *.rpm 

Or yum install openoffice.org-core.x86_64 

2) Temporarily disable SELinux.

$ su -
$ setenforce permissive

3) Configure the KnowledgeTree repositories
a) Create a new file with the following content and copy it to
/etc/yum.repos.d/KT.repo

[KT]
name=KT
baseurl=http://repos.knowledgetree.com/rpm/rhel/5/$basearch
enabled=1
gpgcheck=0

[KTnoarch]
name=KT - noarch
baseurl=http://repos.knowledgetree.com/rpm/rhel/5/noarch
enabled=1
gpgcheck=0

[Zend]
name=Zend Server
baseurl=http://repos.zend.com/zend-server/rpm/$basearch
enabled=1
gpgcheck=0

[Zendnoarch]
name=Zend Server - noarch
baseurl=http://repos.zend.com/zend-server/rpm/noarch
enabled=1
gpgcheck=0

b) Update Yum

$ yum update

4) Install KnowledgeTree using Yum

$ yum install knowledgetree-ce

/etc/init.d/zend-server restart

If some package failed try to reinstall with yum separately , 

if mysql not installed install separately or use default mysql 

start with " service mysqld start " and stop httpd service

"service httpd stop"