[keycloak-user] Max number of Realms supported each keycloak instance/node

[Vishnu Prakash]

Hi,
   Is it possible to support more than 100 realms, by running keycloak in
high availability mode. Or there also we need to restrict the realms below
100?
Currently we are building a cloud based multitenant SAAS application in
which we are planning to use Keycloak for Identity and Access Management.
We thought of  segregating
tenants using realm. If we proceed in this way, will that be a bottleneck
in future.

Thanks & Regards,
Vishnu Prakash



On Fri, Oct 25, 2019 at 5:30 AM Nagendra Darla <dvv.nagendra at gmail.com>
wrote:

> Thank you so much Jan!
>
> On Thu, Oct 24, 2019 at 11:13 AM Jan Lieskovsky <jlieskov at redhat.com>
> wrote:
>
> > Hello Nagendra,
> >
> > On Thu, Oct 24, 2019 at 7:12 PM Nagendra Darla <dvv.nagendra at gmail.com>
> > wrote:
> >
> >> Hello All,
> >>
> >> Can someone help me with my question?
> >>
> >> Thank you.
> >>
> >> On Wed, Oct 16, 2019 at 4:26 PM Nagendra Darla <dvv.nagendra at gmail.com>
> >> wrote:
> >>
> >> > Hello All,
> >> >
> >> > I wondering if we have any documentation or suggestion on maximum
> number
> >> > of realms that can be created on a keycloak instance. If it is bases
> on
> >> > hardware configuration then is there any reference configuration
> >> > mentioned anywhere in keycloak documentation ?
> >>
> >
> > AFAICT the maximum number of realms, supported per one Keycloak instance
> > is not documented
> > (as of right now) in the documentation. The reason for that being a
> > prosaic one - it is not possible
> > in the universal case to specify the maximum number of realms, that can
> be
> > supported, as this
> > depends on many factors (HW used, count of CPUs / vCPUs, memory, the load
> > of the Keycloak
> > server itself).
> >
> > Although, so far we know, a performance degradation was observed having
> an
> > ordinary Keycloak
> > instance, having more than 100+ realms. There's an existing JIRA
> > <https://issues.jboss.org/browse/KEYCLOAK-4593> to improve this
> (increase
> > the count of realms, Keycloak server can handle gracefully without
> > performance penalties).
> >
> > Therefore, the (so far) recommended setup would be to limit count of
> > realms to be less than 100
> > per one Keycloak server instance.
> >
> > >
> >> > Your help is much appreciated.
> >> >
> >> > Thank You,
> >> > Nagendra Darla
> >> >
> >>
> >>
> >> --
> >> Thank You,
> >> Nagendra Darla
> >>
> >
> > HTH
> >
> >
> > Regards, Jan
> > --
> > Jan iankko Lieskovsky / Keycloak / RH-SSO Team
> >
> >
>
> --
> Thank You,
> Nagendra Darla
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