+++ This bug was initially created as a clone of Bug #1553517 +++

Description of problem:

Octavia requires python2-cryptography!=2.0,>=1.9 [1] and is synced with global-requirement.txt [2]. CentOS7 provides python2-cryptography-1.7.2-1.el7 which is not good enough and throws exceptions on load balancer create in Octavia:

2018-03-08 23:45:46.453 24634 ERROR octavia.controller.worker.controller_worker   File "/usr/lib/python2.7/site-packages/octavia/certificates/common/pkcs12.py", line 35, in get_certificate
2018-03-08 23:45:46.453 24634 ERROR octavia.controller.worker.controller_worker     return self.certificate.to_cryptography().public_bytes(
2018-03-08 23:45:46.453 24634 ERROR octavia.controller.worker.controller_worker AttributeError: 'X509' object has no attribute 'to_cryptography'

Could we promote python2-cryptography-2.1.4 from Fedora [3]? There might be some considerations to be made first, i.e. bump of openssl and pyopenssl versions?


[1] https://github.com/openstack/octavia/blob/master/requirements.txt#L47
[2] https://github.com/openstack/requirements/blob/master/global-requirements.txt#L28
[3] https://src.fedoraproject.org/rpms/python-cryptography/blob/master/f/python-cryptography.spec

--- Additional comment from Carlos Goncalves on 2018-03-15 07:02:17 EDT ---

python-cryptography>=1.9 is not good enough as recently discovered with a new gate using lower-constraints [1]. Octavia requires python-cryptography>=2.1.

Version bump being requested upstream for global-requirements.txt and lower-constraints.txt in [2].

[1] https://review.openstack.org/#/c/553134/
[2] https://review.openstack.org/#/c/553136/