Keystone: An unexpected error prevented the server from fulfilling your request

junmeindeMacBook-Pro:openstack_api junmein$ bash getToken.sh
HTTP/1.1 500 Internal Server Error
Vary: X-Auth-Token
Content-Type: application/json
Content-Length: 143
X-Openstack-Request-Id: req-33be785e-354b-43cf-b8bb-42a1cfaa7399
Date: Thu, 26 May 2016 12:10:47 GMT

{"error": {"message": "An unexpected error prevented the server from fulfilling your request.", "code": 500, "title": "Internal Server Error"}}junmeindeMacBook-Pro:openstack_api junmein$

How to solve it.

Increase CPU to 2 and Memory to 2048MB

And Then,

junmeindeMacBook-Pro:openstack_api junmein$ bash getToken.sh
HTTP/1.1 201 Created
X-Subject-Token: 8ff2f1ac3e90408f9e07740c899fbec7
Vary: X-Auth-Token
Content-Type: application/json
Content-Length: 1025
X-Openstack-Request-Id: req-38d18987-1bd2-4741-8076-71537aa9f8b0
Date: Thu, 26 May 2016 12:11:42 GMT

{"token": {"methods": ["password"], "roles": [{"id": "b4a892c14ba544cc84512002fa53bc97", "name": "admin"}], "expires_at": "2016-05-26T13:11:42.427621Z", "project": {"domain": {"id": "default", "name": "Default"}, "id": "ab202654a6734d0b8099eec2d49fd27b", "name": "admin"}, "catalog": [{"endpoints": [{"region_id": "RegionTwo", "url": "http://lala/v2", "region": "RegionTwo", "interface": "admin", "id": "903f2a276e40478987e8a2fa260602c4"}, {"region_id": "RegionTwo", "url": "http://haha/v2", "region": "RegionTwo", "interface": "public", "id": "c1fc46cd6ace40bea248e49d8dba24ac"}, {"region_id": "RegionTwo", "url": "http://sasa/v2", "region": "RegionTwo", "interface": "internal", "id": "dbf08bfe4490403aa70fb49e33590a82"}], "type": "service1", "id": "0204f666bfc24c9aa9f5922ce6c349b1", "name": "service1"}], "extras": {}, "user": {"domain": {"id": "default", "name": "Default"}, "id": "610de8e29c654110aab95a69f95991cd", "name": "admin"}, "audit_ids": ["r412AaXpSxSwL0mqZZrYMg"], "issued_at": "2016-05-26T12:11:42.427661Z"}}