Session Replication in the cloud (EC2)

Report · Apr 26, 2013

Hi,

I have 2 ColdFusion instances (different machines) in a cluster on amazon EC2.

They are working fine, except for session replication.

EC2 don't support IP multicasting. So, I am trying a static approach.

I had added a static member interceptor:

<Interceptor className="org.apache.catalina.tribes.group.interceptors.StaticMembershipInterceptor">

<Member

className="org.apache.catalina.tribes.membership.StaticMember"

port="4001"

host="remoteIP"

domain="ClusterName"

uniqueId="{1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0}"/>

</Interceptor>

and disabled the multicasting commenting this:

<!-- <Membership port="45565" dropTime="3000" address="228.0.0.4" className="org.apache.catalina.tribes.membership.McastService" frequency="500">

</Membership> -->

and changing the cluster tag like this

<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster" channelSendOptions="6" channelStartOptions="3">

This worked locally on my machine, but in EC2 is not replicating.

The logs have:

Apr 26, 2013 8:47:44 PM org.apache.catalina.ha.tcp.SimpleTcpCluster memberAdded, which is good.

Also have this messages:

Apr 26, 2013 8:48:02 PM org.apache.catalina.ha.session.ClusterSessionListener messageReceived

WARNING: Context manager doesn't exist:localhost#/

So, I am lost here.. what else can I try?

Report · May 01, 2013

Do you need to replicate the sessions, you may be able to use sticky sessions with better results.