From Wsms

installation on centos 5

I used the Add/Remove software command. Horde is included in the "CentOs Extras" category. I also installed all the optional packages that for horde.

mysqld and httpd need to be running. Start them in the usual way.

Configuring mysql for horde is explained in: /usr/share/horde/scripts/sql/README

wiki.horde.org/CentOS5InstallationNotes has another approach.

see also

horde.org
service
mysqld
httpd
chkconfig