user@mylaptop:~/ansible$ cat ansible.cfg
[ssh_connection]
ssh_args = -F ssh.config
scp_if_ssh = True
inventory = "/home/user/ansible/hosts"
user@mylaptop:~/ansible$cat hosts
[controller]
controller1.ext.clark.openstack
controller2.ext.clark.openstack
services1.ext.clark.openstack

[network]
network1.int.clark.openstack
network2.int.clark.openstack

[storage]
storage1.int.clark.openstack
storage2.int.clark.openstack
storage3.int.clark.openstack

[compute]
compute1.int.clark.openstack
compute2.int.clark.openstack
compute3.int.clark.openstack
user@mylaptop:~/ansible$ansible controller -a "ls"
No hosts matched