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

Lance Bragstad lbragstad at gmail.com
Wed Feb 15 15:06:51 UTC 2017

In addition to what David said, have you played around with caching in
keystone [0]? After the initial implementation of fernet landed, we
attempted to make it the default token provider. We ended up reverting the
default back to uuid because we hit several issues. Around the Liberty and
Mitaka timeframe, we reworked the caching implementation to fix those
issues and improve overall performance of all token formats, especially

We have a few different performance perspectives available, too. Some were
run nearly 2 years ago [1] and some are run today [2]. Since the Newton
release, we've made drastic improvements to the overall structure of the
token provider [3] [4] [5]. At the very least, it should make understanding
keystone's approach to tokens easier. Maintaining out-of-tree token
providers should also be easier since we cleaned up a lot of the interfaces
that affect developers maintaining their own providers.

We can try and set something up at the PTG. We are getting pretty tight for
time slots, but I'm sure we can find some time to work through the issues
you're seeing (also, feel free to hop into #openstack-keystone on freenode
if you want to visit prior to the PTG).

[1] http://dolphm.com/benchmarking-openstack-keystone-token-formats/
[2] https://github.com/lbragstad/keystone-performance

On Wed, Feb 15, 2017 at 8:44 AM, David Stanek <dstanek at dstanek.com> wrote:

> 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/12cL9bq9EARjZw9IS3YxVmYsGfdauM
> 25NzZcdzPE0fvY/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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