Can registration by done by clients? Avoid multicast discovery?

[bill.burke]

Can clients be pointed to the load balancer through config and register themselves with the loadbalancer at boot time instead of doing this multicast discovery protocol?

[mbabacek]

Yes, add outbound socket binding:

/socket-binding-group=standard-sockets/remote-destination-outbound-socket-binding=my-proxies:add(host=10.10.10.11,port=3333)

and then add this proxy of yours to mod_cluster subsystem config:

/subsystem=modcluster/mod-cluster-config=configuration:write-attribute(name=proxies, value="my-proxies")

(written from the top of my head, complimentary typos could be included )

[bill.burke]

I just can't get this to work.  How can you turn off all the multicast stuff?  What values do you put in the outbound-socket-binding?  What host/port is the load balancer listening for connection messages?  How do you set that host/port?  What is the "management-socking-binding"?

[rhusar]

Michal, proxies attribute is a list type, so you need to make sure you pass in a list:

[standalone@localhost:9990 /] /subsystem=modcluster/mod-cluster-config=configuration:write-attribute(name=proxies, value="my-proxies")
{
    "outcome" => "failed",
    "failure-description" => "WFLYCTL0097: Wrong type for proxies. Expected [LIST] but was STRING",
    "rolled-back" => true
}
[standalone@localhost:9990 /] /subsystem=modcluster/mod-cluster-config=configuration:write-attribute(name=proxies, value=[my-proxies])
{
    "outcome" => "success",
    "response-headers" => {
        "operation-requires-reload" => true,
        "process-state" => "reload-required"
    }
}

[rhusar]

Bill, the static configuration should look like:

• remove advertise-socket="modcluster"
• remove the respective modcluster binding
• configure advertise="false"
• add outbound-socket-binding for each proxy (see Michal's CLI command)
• configure proxies="" with a list of the created outbound-socket-binding (see above comment)

I have recently filed and submitted fixes for related issues:

• [WFLY-6576] mod_cluster advertise="false" does not disable advertise if there are no proxies configured - JBoss Issue Tr…
• [WFLY-6575] Cloud environment example profiles have configured mod_cluster with multicast-based advertise - JBoss Issue …