If you are behind the proxy, then you have to set no_proxy environmental variable for your localhost and all the IPs acquire by you host. Like if ip is 192.168.10.10, then:
./unstack.sh
export no_proxy=localhost,127.0.0.1,192.168.10.10
./stack.sh
转自： https://ask.openstack.org/en/question/87854/keystone-token-generation-fails-for-devstack/Discovering versions from the identity service failed when creating the password plugin.
原文：http://www.cnblogs.com/pinganzi/p/5989218.html