[user@admin ~]$ eval $(ssh-agent )
[user@admin ~]$ ssh-add .ssh/root 
[user@admin ~]$ git clone https://github.com/ac427/my_cm.git
[user@admin ~]$ cd my_cm/ansible/
[user@admin ansible]$ ansible-playbook -i hosts -u root cobbler.yml 

one you import iso to cobbler you can start adding nodes using playbooks/add_node

To import iso to cobbler

wget http://mirror.cs.vt.edu/pub/CentOS/7/isos/x86_64/CentOS-7-x86_64-Minimal-1511.iso -P /tmp
sudo mkdir -p /mnt/centos7
sudo mount -o loop /tmp/CentOS-7-x86_64-Minimal-1511.iso /mnt/centos7/
sudo cobbler import --path=/mnt/centos7/ --name=centos7-x86_64 --available-as=http://admin.home/centos7
sudo ansible-playbook -i hosts -u root  --extra-vars "target=admin" playbooks/add_node

To add compute node, you can run below. Read playboks/add_node file for more info

#create a host_vars/<hostname> file FIRST!
ansible-playbook -i hosts -u root  --extra-vars "target=compute1 profile=centos7-x86_64" playbooks/add_node

To run ansible via jenkis, check Readme of ansible role ansible_jenkins_role