[keycloak-user] [EXTERNAL] Re: Trust between two standalone Keycloak Instances

[Stan Silvert]

On 7/16/2019 1:26 PM, Aditya Bhole wrote:
> I understand that deploying 3 clients under one realm will easily enable SSO. Even if we keep the clients in different realms, cross-realm trust can be established. But the use case of our prototype wants the clients to be on different servers. I’ll try to explain as best as I can.
>
> Our company has 3 products deployed independently and these are managed by different administrators. Sometimes these have to be integrated with each other for seamless cross product experience at which time we would want SSO between the individual product UIs. We intend to use Keycloak as a broker for authentication and to achieve SSO. So that’s why I wanted to know if trust between two standalone Keycloak instances can be established.
>
> Also, if we deploy the domain controller, can there still be local settings on the different Keycloak instances?
>
> Thanks,
> Aditya
Yes, it can be done, but I still don't understand why you would want to 
do it this way.  You can also establish trust between two realms on the 
same server.  That way, you don't need multiple instances of Keycloak to 
have the apps be fully walled off from each other.

That being said, I still don't understand why you wouldn't just do it 
the easy way.  Are you saying that sometimes you want SSO and sometimes 
you don't?  I must be missing something from your use case.

Lastly, the domain features of WildFly are just used to centrally manage 
instances of the server.  These servers can be configured any way you 
want.  I guess this depends on what you mean by "local settings".
>
> On 7/15/19, 12:25 PM, "keycloak-user-bounces at lists.jboss.org on behalf of Stan Silvert" <keycloak-user-bounces at lists.jboss.org on behalf of ssilvert at redhat.com> wrote:
>
>      Why do you need each to have its own Keycloak instance?  A usual setup
>      would define all three clients in the same realm under the same Keycloak
>      instance.
>      
>      On 7/15/2019 1:23 PM, Aditya Bhole wrote:
>      > Hello,
>      >
>      > I’m new to Keycloak and building a prototype SSO framework for my company. The use case is that my company has 3 clients; A, B and C. Now each client is going to have its own Keycloak instance; KA, KB and KC. Now what I want is when I login through client A I should be logged into client B and C as well. And same goes for all the clients. So for this to happen, is there a way of establishing trust between these three Keycloak instances KA, KB and KC?
>      > I’ve successfully established an SSO by using KA as a broker and KB as an IDP. But this is only a master slave kind-of an architecture. When I log in to A, I’m automatically logged into B. But if I log into B, I won’t be automatically logged into A. Is it possible for KA to be a broker for KB and KB to be a broker for KA at the same time?
>      > TL;DR :
>      > Is there a way where Keycloak only acts as a broker and trust is established between multiple such Keycloak instances?
>      >
>      > I hope my question makes sense. Please point me in the right direction if I’m looking at this in the wrong way.
>      >
>      > Thanks,
>      > Aditya
>      >
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