Ansible installed as advised version 2.0.2 ( CentOS 7.2 , i7 4790 16 GB RAM) File playbooks/roles/common/defaults/main.yml has been updated # overrides configured. default_disk: 50 default_memory: 4096 default_vcpu: 2 # The undercloud needs more than the default amount of memory # and disk. undercloud_memory: 4096 undercloud_disk: 50 undercloud_vcpu: 4 Attempting to run :- [root@centos72server tripleo-quickstart]# ansible-playbook playbooks/centosci/minimal.yml \ -e virthost=centos72server.localdomain ERROR! playbooks must be a list of plays The error appears to have been in '/root/tripleo-quickstart/playbooks/centosci/minimal.yml': line 3, column 1, but may be elsewhere in the file depending on the exact syntax problem. The offending line appears to be: # for this job, but test all defaults otherwise step_introspect: true ^ here Thank you Boris.