For CentOS 7 run the following as root:
cd /etc/yum.repos.d/
wget https://download.opensuse.org/repositories/home:Tnokon:suse-to-centos/CentOS_7/home:Tnokon:suse-to-centos.repo
yum install insserv
For CentOS 6 run the following as root:
cd /etc/yum.repos.d/
wget https://download.opensuse.org/repositories/home:Tnokon:suse-to-centos/CentOS_6/home:Tnokon:suse-to-centos.repo
yum install insserv
For CentOS 5 run the following as root:
cd /etc/yum.repos.d/
wget https://download.opensuse.org/repositories/home:Tnokon:suse-to-centos/CentOS_5/home:Tnokon:suse-to-centos.repo
yum install insserv