This error is commonly encountered when another library is not cleaning up the OpenSSL error

[Antonio De Iasio]

ERROR: Unknown OpenSSL error. This error is commonly encountered when another library is not cleaning up the OpenSSL error stack. If you are using cryptography with another library that uses OpenSSL try disabling it before reporting a bug. Otherwise please file an issue at https://github.com/pyca/cryptography/issues with information on how to reproduce this. ([_OpenSSLErrorWithText(code=2148712748L, lib=128, func=300, reason=300, reason_text="error:8012C12C:lib(128):dev_urandom_fd:open('/dev/urandom') failed.")])

Whenever I try to start-up the glance service, I get that error above.

I run openstack train on centos 7