[openstack-dev] [keystone]PKI token VS Fernet token

王玺源 wangxiyuan1007 at gmail.com
Fri Feb 17 14:08:30 UTC 2017

Hi David:

We have not find the perfect solution to solve the fernet performance
issue, we will try the different crypt strength setting with fernet in

There are multiple customers have more than 6-region cascade, how to
synchronous keystone data between these region disturbed us a lot. It does
not need to synchronize these data while using pki token, because the pki
token including the roles information.

The pki token has been verified that can support such large-scale
production environment, which even the uuid token has performance issue in

Through the pki token is large size, but the size also make it difficult
for guessing or steal.
David Stanek <dstanek at dstanek.com>于2017年2月15日 周三下午10:45写道:

> On 15-Feb 18:16, 王玺源 wrote:
> > Hello everyone,
> >   PKI/PKIZ token has been removed from keystone in Ocata. But recently
> our
> > production team did some test about PKI and Fernet token (With Keystone
> > Mitaka). They found that in large-scale production environment, Fernet
> > token's performance is not as good as PKI. Here is the test data:
> >
> >
> https://docs.google.com/document/d/12cL9bq9EARjZw9IS3YxVmYsGfdauM25NzZcdzPE0fvY/edit?usp=sharing
> This is nice to see. Thanks.
> >
> > From the data, we can see that:
> > 1. In large-scale concurrency test, PKI is much faster than Fernet.
> > 2. PKI token revoke can't immediately make the token invalid. So it has
> the
> > revoke issue.  https://wiki.openstack.org/wiki/OSSN/OSSN-0062
> >
> > But in our production team's opinion, the revoke issue is a small
> problem,
> > and can be avoided by some periphery ways. (More detail solution could be
> > explained by them in the follow email).
> > They think that the performance issue is the most important thing. Maybe
> > you can see that in some production environment, performance is the first
> > thing to be considered.
> I'd like to hear solutions to this if you have already come up with
> them. This issue, however, isn't the only one that led us to remove PKI
> tokens.
> >
> > So here I'd like to ask you, especially the keystone experts:
> > 1. Is there any chance to bring PKI/PKIZ back to Keystone?
> I would guess that, at least in the immediate future, we would not want
> to put it back into keystone until someone can fix the issues. Also
> ideally running the token provider in production.
> > 2. Has Fernet token improved the performance during these releases? Or
> any
> > road map so that we can make sure Fernet is better than PKI in all side.
> > Otherwise, I don't think that remove PKI in Ocata is the right way. Or
> > even, we can keep the PKI token in Keystone for more one or two cycles,
> > then remove it once Fernet is stable enough.
> > 3. Since I'll be in Atalanta next week, if it is possible, I'd like to
> > bring this topic to Keystone PTG. can I?
> Sure. We have a pretty packed calendar, but I'm sure you could steal a
> few minutes somewhere.
> >
> > It is a real production problem and I really need your feedback.
> >
> Have you tried playing with the crypt_strength[1]? If the slowness is
> the crypto (which it was in the past) then you can tune it a little bit.
> Another option might be to keep the same token flow and find a faster
> method for hashing a token.
> 1.
> http://git.openstack.org/cgit/openstack/keystone/tree/etc/keystone.conf.sample#n67
> --
> david stanek
> web: https://dstanek.com
> twitter: https://twitter.com/dstanek
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