9:50 a.m.
Hey Vlasta,
thanks. I just created this ticket https://issues.jboss.org/browse/KEYCLOAK-9855
— Jens
On 14. Mar 2019, at 12:10, Vlasta Ramik
<vramik@redhat.com<mailto:vramik@redhat.com>> wrote:
Hey Jens,
would you mind to create a ticket[1] for the issue, please?
[1] https://issues.jboss.org/projects/KEYCLOAK
On 3/13/19 2:38 PM, Jens Bissinger wrote:
Hi,
we have a keycloak instance running as docker container in our AWS ECS docker
environment.
For single instance this setup works great, but we failed to enhance it with a second
instance for HA.
Problem: We cannot authenticate in one of instances behind the load balancer as soon as we
have more than one keycloak instance.
Cluster setup:
- Keycloak v5.0.0 (docker image
quay.io/keycloak/keycloak:5.0.0<http://quay.io/keycloak/keycloak:5.0.0>)
- Containers are behind AWS ALB load balancers with round-robin but without sticky
sessions (the latter is important for our setup)
- JGroups with JDBC_PING configured and instances properly add/remove themselve from the
configured MySQL table
- Containers run on separete EC2 hosts, TCP communication between containers is possible
(port 7600 exposed also on hosts)
- Cache owners for all distributed caches are set to 2 (we also tested with 1 but without
any different results)
Startup logs from infinispan look fine:
- On startup we see log message that cluster nodes can discover each other
"ISPN000094: Received new cluster view for channel ejb:
[ip-10-129-2-31.eu<http://ip-10-129-2-31.eu>-central-1.compute.internal|1] (2)
[ip-10-129-2-31.eu<http://ip-10-129-2-31.eu>-central-1.compute.internal,
ip-10-129-2-54.eu<http://ip-10-129-2-54.eu>-central-1.compute.internal]"
- After that also infinispan rebalancing happens
"[Context=offlineClientSessions] ISPN100010: Finished rebalance with members
[ip-10-129-2-31.eu<http://ip-10-129-2-31.eu>-central-1.compute.internal,
ip-10-129-2-54.eu<http://ip-10-129-2-54.eu>-central-1.compute.internal]”
Analysis (so far):
- The problem is obviously because authentication starts on node 1. Due to round robin
authentication will be continued on node 2 and this fails because node 2 does not know
about the authentication session started on node 1.
- According to the documentation there should be a lookup from node 2 in the cluster for
started authentication session. Seems like this is not happening, but we cannot see any
log related to this.
- Also regular sessions are not distributed in the cache. We tested this running only 1
node to do the authentication and then spinning up a second node and doing a fail-over to
the new node. Afterwards the regular session was gone (we are logged out).
Thank you very much.
Regards
Jens Bissinger
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