Here are the steps on how to install Spacewalk on a Cent OS instance 

Here are various Spacewalk install and config videos on YouTube 

Install Spacewalk 2.1 on CentOS 6.5  (initial install and setup)
https://www.youtube.com/watch?v=135m28OpupU&list=PL3DVKoq8wxjQCDGWjdSMJUjKWzfO1V3vH&index=3

Create Spacewalk CentOS 6.5 Channel
https://www.youtube.com/watch?v=C7UZM7COdH0&list=PL3DVKoq8wxjQCDGWjdSMJUjKWzfO1V3vH&index=2

Spacewalk Install children channels
https://www.youtube.com/watch?v=hWCq6Q5ZEhE&list=PL3DVKoq8wxjQCDGWjdSMJUjKWzfO1V3vH&index=4

Create Activation Key 2.1 Spacewalk Server (to add existing system to spacewalk)
https://www.youtube.com/watch?v=1HxhSqTMXm4&list=PL3DVKoq8wxjQCDGWjdSMJUjKWzfO1V3vH&index=5

Create distribution and kickstart profile for Spacewalk 2.1
https://www.youtube.com/watch?v=tqs_tvLdFM8&list=PL3DVKoq8wxjQCDGWjdSMJUjKWzfO1V3vH&index=6
 

Repositories:
i. rpm -Uvh http://yum.spacewalkproject.org/2.7/R...
ii. curl -O https://copr.fedorainfracloud.org/coprs/g/spacewalkproject/java-packages/repo/epel-7/group_spacewalkproject-java-packages-epel-7.repo
iii. rpm -Uvh https://dl.fedoraproject.org/pub/epel...

Configure Firewall:
i. firewall-cmd --permanent --add-service=http ; firewall-cmd --permanent --add-service=https
 
To apply fw changes:
firewall-cmd --reload

Install Database:
i. yum install spacewalk-setup-postgresql
ii. yum install spacewalk-postgresql -y
iii. postgresql-setup initdb
iv. spacewalk-setup