3:48 p.m.
Hi Matt,
I’m not an active Keycloak dev but we used to run our Keycloak cluster on AWS Beanstalk.
My advice would be to not use AWS Beanstalk for Keycloak. AWS Beanstalk is OK for simple
applications but we had to write custom Beanstalk hooks to get Infinspan to behave
correctly. I would suggest using AWS Elastic Cluster Service (ECS) and if you don’t want
to manage the instances use Fargate instead of EC2.
Just to be clear: this isn’t a criticism of either Keycloak / WildFily / Infinispan or AWS
Beanstalk. It’s just advice from another engineer who has experience with the combination
of these two products. Since moving to to ECS we haven’t had any issues with the cache
during deployments.
As for your suggested configuration: I don’t think the user, realm and key caches should
be changed. These caches are not an issue during deployments and they reduce DB load
significantly the way they’re configured out of the box.
Best,
Scott
Scott Rossillo
Smartling | Senior Software Engineer
srossillo(a)smartling.com
On Jun 4, 2018, at 2:19 PM, Matt Domsch (mdomsch)
<Matt.Domsch(a)quest.com> wrote:
While we're at it, shouldn't the realm, user, and key caches all be invalidation
caches too, with a limit on the number of objects in each? The objects are persisted to
disk. In our case, I've got >85k user records, and suspect that the <local>
user cache is growing unbounded, hence I'm seeing steadily increasing memory usage.
Thanks,
Matt
--
Matt Domsch
Executive Director & Senior Distinguished Engineer
Quest | Engineering
Matt.Domsch(a)quest.com
Mobile 512.981.6486
-----Original Message-----
From: keycloak-dev-bounces(a)lists.jboss.org [mailto:keycloak-dev-bounces@lists.jboss.org]
On Behalf Of Matt Domsch (mdomsch)
Sent: Thursday, May 31, 2018 4:06 PM
To: keycloak-dev(a)lists.jboss.org
Subject: [keycloak-dev] session caching questions
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In our deployments, we have need for the individual nodes in our standalone-ha cluster to
be able to be stopped and restarted at any time, without loss of user sessions. We deploy
into AWS Elastic Beanstalk, and join the "new" nodes into the existing JGroups
cluster of "old" nodes, switch CNAMEs, then shut down the "old" nodes.
The default suggested model of using <distributed-cache> for the session and
clientSession caches fails in this scenario, as sessions stored only in memory on the
"old" nodes are lost. As such, we've switched to <replicated-cache>
for most of the caches. Does this make sense? Are most people using Keycloak running
>10 nodes per cluster such that replicated cache doesn't make sense for performance
reasons? If not, can the example standalone-ha.xml be adjusted to use replicated-cache?
When items are placed into the caches, it seems that they are not put() with a lifetime
or expiry time associated with them. This has led us to run into out-of-memory issues as
the sizes of these caches grows without bound. We've added expiration times in the
XML config to adjust for maximum lifetimes based on the longest session timeouts across
all realms. This seems not ideal. It would be better to put() including the current
active session timeouts for the realm for the object from which it originates.
We cannot evict items in the sessions and clientSessions caches as they are not persisted
to disk. The Offline variants are persisted to disk, so evicting these seem OK. Should
this then be an invalidation-cache rather than a replicated-cache?
XML snippet:
<subsystem xmlns="urn:jboss:domain:infinispan:4.0">
<cache-container name="keycloak"
jndi-name="infinispan/Keycloak" statistics-enabled="true">
<replicated-cache name="sessions" mode="SYNC"
statistics-enabled="true">
<!-- NOT persisted to the database, so cannot evict within their
valid lifetime -->
<!-- max-idle = refresh_token:1 day -->
<expiration max-idle="86700000"
interval="300000"/>
</replicated-cache>
<replicated-cache name="clientSessions" mode="SYNC"
statistics-enabled="true">
<!-- NOT persisted to the database, so cannot evict within their
valid lifetime -->
<!-- max-idle = refresh_token:1 day -->
<expiration max-idle="86700000"
interval="300000"/>
</replicated-cache>
<replicated-cache name="authenticationSessions"
mode="SYNC" statistics-enabled="true">
<!-- NOT persisted to the database, so cannot evict within their
valid lifetime -->
<!-- max-idle = login timeout:1 day -->
<expiration max-idle="86700000"
interval="300000"/>
</replicated-cache>
<replicated-cache name="offlineSessions"
mode="SYNC" statistics-enabled="true">
<!-- max-idle = refresh_token:30 days -->
<eviction max-entries="10000"
strategy="LRU"/>
<expiration max-idle="2592000000"
interval="300000"/>
</replicated-cache>
<replicated-cache name="offlineClientSessions"
mode="SYNC" statistics-enabled="true">
<eviction max-entries="10000"
strategy="LRU"/>
<expiration max-idle="2592000000"
interval="300000"/>
</replicated-cache>
Thanks,
Matt
--
Matt Domsch
Executive Director & Senior Distinguished Engineer Quest | Engineering
Matt.Domsch@quest.com<mailto:Matt.Domsch@quest.com>
Mobile 512.981.6486
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