Ref: https://developer.openstack.org/api-ref/compute/

To Get Keystone Token:

V2:

curl -i -X POST 
http://192.168.200.71:35357/v2.0/tokens
 -H "Content-Type: application/json" -H "User-Agent: python-keystoneclient" -d '{"auth": {"tenantName": "admin", "passwordCredentials": {"username": "admin", "password": "password"}}}'

V3:

curl -i -H "Content-Type: application/json" \
-d '{ "auth": { "identity": { "methods": ["password"], "password": { "user": { "name": "admin", "domain": { "id": "default" },
"password": "admin" } } } } }' http://localhost:5000/v3/auth/tokens

Get OS_HOST, Put the Token into it:

curl -i -g -X GET -H "X-Auth-Token:70b5ee2ddf2141d49a4fb81084fb2310" -H 'Content-Type: application/json' http://192.168.200.71:8774/v2.1/os-hosts/cmp