2 Replies Latest reply on Feb 19, 2019 3:58 PM by ievgenii24

How to control Wildfly Undertow load balancer

ievgenii24 Feb 15, 2019 1:21 PM

Hi,

does anybody know how can i control wildfly undertow loadbalancer?

Here is my load balancer configuration:

<buffer-cache name="default"/>

<http-listener name="default" socket-binding="http" redirect-socket="https" enable-http2="true"/>

<https-listener name="https" socket-binding="https" secure="true" security-realm="ssl-security-realm" enabled-protocols="TLSv1.2" enable-http2="true"/>

<http-listener name="management" socket-binding="mcmp-management" enable-http2="true"/>

<filter-ref name="load-balancer"/>

</host>

</server>

<servlet-container name="default"/>

<mod-cluster name="load-balancer" management-socket-binding="mcmp-management" advertise-socket-binding="modcluster" enable-http2="true" max-retries="3" security-key="lbtestapp"/>

</filters>

</subsystem>

I'm using domain cluster configuration, and it seems it works, as i can see from jboss domain.log that nodes registered and unregistered..

With CLI command i can get only to:

ls /profile=balancer-profile/subsystem=undertow/configuration=filter/mod-cluster=load-balancer/balancer - but it shows nothing

Commands like:

ls /profile=balancer-profile/subsystem=undertow/configuration=filter/mod-cluster=load-balancer/balancer=mycluster/node=masterOne - does not work (it can't find resource with "mycluster" name)

How can i give the name for my undertow load balancer?

And how can i remove/disable nodes from load balancer?

Also i did setup security-key="lbtestapp" on load balancer node and on slave node, but load balancer registers nodes which does not have security-key configured (i've tryed to change advertise-socket - no success, it still picking up not needed nodes..)

Is there any help which describe what i can do with "/profile=balancer-profile/subsystem=undertow/configuration=filter/mod-cluster=load-balancer/balancer" object?

Thanks.

1. Re: How to control Wildfly Undertow load balancer

rhusar Feb 19, 2019 3:18 PM (in response to ievgenii24)

Please see the following command and a sample output of the command. Note that these are runtime resources, thus you need to operate on the running resources e.g. starting with /host=master/server=load-balancer rather than the profile configuration at e.g. /profile=balancer-profile.

The balancer name is whatever you have configured in your mod_cluster backend worker subsystem.

[domain@localhost:9990 /] /host=master/server=load-balancer/subsystem=undertow/configuration=filter/mod-cluster=modcluster/balancer=mycluster:read-resource(recursive=true,include-runtime=true
{
    "outcome" => "success",
    "result" => {
        "max-attempts" => 1,
        "sticky-session" => true,
        "sticky-session-cookie" => "JSESSIONID",
        "sticky-session-force" => false,
        "sticky-session-path" => undefined,
        "sticky-session-remove" => false,
        "wait-worker" => 0,
        "load-balancing-group" => undefined,
        "node" => {
            "backend2" => {
                "aliases" => [
                    "default-host",
                    "192.168.1.2"
                ],
                "cache-connections" => 40,
                "elected" => 0,
                "flush-packets" => false,
                "load" => 83,
                "load-balancing-group" => undefined,
                "max-connections" => 40,
                "open-connections" => 6,
                "ping" => 10,
                "queue-new-requests" => true,
                "read" => 0L,
                "request-queue-size" => 1000,
                "status" => "NODE_UP",
                "timeout" => 0,
                "ttl" => 60L,
                "uri" => "ajp://127.0.0.1:8209/?#",
                "written" => 0L,
                "context" => {
                    "/" => {
                        "requests" => 0,
                        "status" => "enabled"
                    },
                    "/wildfly-services" => {
                        "requests" => 0,
                        "status" => "enabled"
                    }
                }
            },
            "backend1" => {
                "aliases" => [
                    "default-host",
                    "192.168.1.2"
                ],
                "cache-connections" => 40,
                "elected" => 0,
                "flush-packets" => false,
                "load" => 83,
                "load-balancing-group" => undefined,
                "max-connections" => 40,
                "open-connections" => 6,
                "ping" => 10,
                "queue-new-requests" => true,
                "read" => 0L,
                "request-queue-size" => 1000,
                "status" => "NODE_UP",
                "timeout" => 0,
                "ttl" => 60L,
                "uri" => "ajp://127.0.0.1:8109/?#",
                "written" => 0L,
                "context" => {
                    "/" => {
                        "requests" => 0,
                        "status" => "enabled"
                    },
                    "/wildfly-services" => {
                        "requests" => 0,
                        "status" => "enabled"
                    }
                }
            }
        }
    }
}

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2. Re: How to control Wildfly Undertow load balancer

ievgenii24 Feb 19, 2019 3:58 PM (in response to rhusar)

Thanks a lot! It works!

Maybe you also know why Undertow load balancer can pick up wrong nodes? (I did try to setup security-key and change advertise IP address, but nothing helped)
The only way i was able to filter out not needed nodes is to add filter like this:

<expression-filter name="ip-access-filter" expression="ip-access-control(default-allow=false, acl={'xxx.xx.xxx.xx allow', 'xxx.xxx.xxx.xxx allow'})" />
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