[keycloak-dev] Application Clustering problems

Marek Posolda mposolda at redhat.com
Tue Jan 26 11:36:29 EST 2016


Hi,

I've put some small note at the first paragraph of "Application 
clustering" chapter. Just a small note really, as setup of 
"distributable" in web.xml or configuration of infinispan are app. 
server specific steps and they are general to HttpSession replication 
and clustering, it's not Keycloak specific stuff.

Marek

On 26/01/16 12:55, Christian Beikov wrote:
> I am really sorry about the last mail, I just felt that my suggestions 
> about a possible problem were ignored, especially since you just 
> suggested to google it.
>
> In the end I found out that I was missing the <distributable/> tag in 
> my web.xml to enable session replication properly. So you(Stian) were 
> right after all. I didn't quite get the hint that "need to enable it 
> for your application" actually meant that I had to change the web.xml.
>
> Could you maybe put a warning into the documentation?
>
> Sorry for the noise again.
>
> Regards,
> Christian
>
> Am 26.01.2016 um 08:49 schrieb Stian Thorgersen:
>> I don't see the need for this mail. I was actually trying to help 
>> you. I doubt you've even looked at what I've suggested though.
>>
>> As Bill points out get your HTTP session replication working first. 
>> It has nothing to do with Keycloak. If you want non-sticky sessions 
>> and not using the stateless option then you need that working. The 
>> reason why I told you to google it is that you do actually have to 
>> enable HTTP session replication on a per-war basis. It's not just a 
>> container config. The standalone-ha.xml config in WildFly should be 
>> fine by default, so you don't need to do anything there.
>>
>> On 25 January 2016 at 20:33, Christian Beikov 
>> <christian.beikov at gmail.com <mailto:christian.beikov at gmail.com>> wrote:
>>
>>     I don't want to be rude but you aren't helping me at all so I'd
>>     like to ask someone else from the team about this. I tried to
>>     explain multiple times that I already configured clustering in my
>>     Wildfly server, thus I configured session replication.
>>     Either I don't understand something about session replication or
>>     I require a configuration that you don't mention anywhere.
>>     I copied over the cache container from the standalone-ha
>>     configurations and configured the JGroups Subsystem which is what
>>     is described in the official documentation:
>>     https://docs.jboss.org/author/display/WFLY10/High+Availability+Guide
>>
>>     I think I gave you enough information about my situation which
>>     you seemed to ignore completely. I would very much appreciate if
>>     I got a clear answer to my question especially since I am not
>>     asking for general configuration help, but for this special case
>>     which to me seems like a problem/limitation that should be
>>     explicitly documented.
>>
>>     I am pretty sure clustering/session replication is configured
>>     correctly since I am using a custom cache container with a
>>     similar configuration like the web cache container which I know
>>     replicates correctly. So here comes my question once again, is it
>>     possible that the replication just lags behind which makes the
>>     usage of round robin completely impossible in the login flow? Or
>>     is there some kind of special configuration I have to do which
>>     differs from the standard cluster configuration as provided by
>>     the wildfly distribution? Or is this maybe even an implementation
>>     limiation of the server adapter?
>>
>>     Regards,
>>     Christian
>>
>>
>>     Am 25.01.2016 um 19:04 schrieb Stian Thorgersen:
>>>     Try google for wildfly replicate http sessions
>>>
>>>     On 25 January 2016 at 15:53, Christian Beikov
>>>     <christian.beikov at gmail.com> wrote:
>>>
>>>         I just wrote that I configured clustering for my application
>>>         just like in the standlone-ha.xml of my Wildfly 10 CR4.
>>>         I configured the jgroups subsystem and the distributed
>>>         caches for web sessions as it is done in standalone-ha.xml
>>>         of Wildfly.
>>>         If there is anything else that should be configured, can you
>>>         please point me to that configuration option?
>>>
>>>         Regards,
>>>         Christian
>>>
>>>
>>>         Am 25.01.2016 um 15:45 schrieb Stian Thorgersen:
>>>>         HTTP session replicate is not enabled by default. You need
>>>>         to enable it for your application.
>>>>
>>>>         On 25 January 2016 at 14:39, Christian Beikov
>>>>         <christian.beikov at gmail.com> wrote:
>>>>
>>>>             The documentation states, that the default token-store
>>>>             is "session" and as I wrote before, I have setup
>>>>             clustering on my Wildfly 10 CR4 like in
>>>>             standalone-ha.xml, so the session should already be
>>>>             replicated.
>>>>
>>>>             Regards,
>>>>             Christian
>>>>
>>>>
>>>>             Am 25.01.2016 um 14:20 schrieb Stian Thorgersen:
>>>>>             Your issue doesn't have anything to do with the
>>>>>             Keycloak server side user sessions, they don't require
>>>>>             sticky sessions.
>>>>>
>>>>>             Your issue is down to the http session on the adapter
>>>>>             side not being replicated by default. For the adapter
>>>>>             you've got 3 choices: sticky session, replicated
>>>>>             session or stateless. Which is best depends on your
>>>>>             application.
>>>>>
>>>>>
>>>>>             On 25 January 2016 at 14:05, Christian Beikov
>>>>>             <christian.beikov at gmail.com> wrote:
>>>>>
>>>>>                 I don't have a problem with sticky sessions and I
>>>>>                 will definitively configure them, but I am
>>>>>                 curious. What is the reason for the problems with
>>>>>                 round robin in this test scenario? Are the
>>>>>                 infinispan caches not replicated fast enough or is
>>>>>                 there an implementation limitation in the adapters?
>>>>>
>>>>>
>>>>>                 Regards,
>>>>>                 Christian
>>>>>
>>>>>
>>>>>                 Am 25.01.2016 um 08:58 schrieb Stian Thorgersen:
>>>>>>                 By default the adapters will require sticky
>>>>>>                 sessions, please refer to
>>>>>>                 http://keycloak.github.io/docs/userguide/keycloak-server/html/applicationClustering.html
>>>>>>                 for more information
>>>>>>
>>>>>>                 On 22 January 2016 at 12:48, Christian Beikov
>>>>>>                 <christian.beikov at gmail.com> wrote:
>>>>>>
>>>>>>                     Hello,
>>>>>>
>>>>>>                     I am running some tests with my application
>>>>>>                     cluster being secured by a
>>>>>>                     single keycloak server instance and I
>>>>>>                     encountered problems with the adapter.
>>>>>>
>>>>>>                     My application cluster contains 2 nodes and
>>>>>>                     is load balanced by nginx.
>>>>>>                     For testing purposes, I enabled round robin
>>>>>>                     load balancing which is
>>>>>>                     probably the "cause" for my issues.
>>>>>>
>>>>>>                     When I access a secured page, I get
>>>>>>                     redirected to keycloak and
>>>>>>                     everything is fine. When I then login, and
>>>>>>                     keycloak redirects me back to
>>>>>>                     the application, I get to a different
>>>>>>                     application cluster node because
>>>>>>                     of round robin. On that node, apparently the
>>>>>>                     initial information of the
>>>>>>                     client session is not available and I get
>>>>>>                     redirected to keycloak login
>>>>>>                     page again. Then keycloak redirects me back
>>>>>>                     to the application, this
>>>>>>                     time to the original node, and says that
>>>>>>                     access is forbidden.
>>>>>>
>>>>>>                     I suppose the web session caches are not in
>>>>>>                     sync but I just used the
>>>>>>                     default cache containers as they are defined
>>>>>>                     in standalone-ha.xml of my
>>>>>>                     Wildlfy 10 CR4. Clustering with jgroups
>>>>>>                     works, as I use other
>>>>>>                     distributed caches too which work just fine.
>>>>>>
>>>>>>                     We are using Keycloak 1.8.0.CR2 on a Wildfly
>>>>>>                     10 CR4
>>>>>>
>>>>>>                     Regards,
>>>>>>                     Christian
>>>>>>                     _______________________________________________
>>>>>>                     keycloak-dev mailing list
>>>>>>                     keycloak-dev at lists.jboss.org
>>>>>>                     https://lists.jboss.org/mailman/listinfo/keycloak-dev
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>
>>>
>>
>>
>
>
>
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