How to create and configure cluster in my Wildfly server. I want to use mod_cluster.

[dima_kononov]

I create 2 examples standalone-server and I want to use mod_cluster for load balancing. I add to /etc/httpd/conf/httpd.conf next lines:

LoadModule proxy_module modules/mod_proxy.so

LoadModule proxy_ajp_module modules/mod_proxy_ajp.so

LoadModule slotmem_module modules/mod_slotmem.so

LoadModule manager_module modules/mod_manager.so

LoadModule proxy_cluster_module modules/mod_proxy_cluster.so

LoadModule advertise_module modules/mod_advertise.so

and I add appropriate files to  /etc/httpd/modules, but I can't run httpd service. If I delete this lines, I run httpd succesfull.

Please, give me step-by-step instruction for configure cluster and load balancing.

Sorry for my bad english=)))

[wdfink]

You should have a look to this document WildFly Cluster Howto

[rhusar]

And read through mod_cluster Documentation

[dima_kononov]

I create file mod-cluster.conf in /etc/httpd/conf.d:

LoadModule slotmem_module modules/mod_slotmem.so

LoadModule manager_module modules/mod_manager.so

LoadModule proxy_cluster_module modules/mod_proxy_cluster.so

LoadModule advertise_module modules/mod_advertise.so

Listen *:10001

MemManagerFile /var/cache/httpd

<VirtualHost *:10001>

    <Directory />

        Order deny,allow

        Deny from all

        Allow from all

    </Directory>

    # This directive allows you to view mod_cluster status at URL http://10.211.55.4:10001/mod_cluster-manager

    <Location /mod_cluster-manager>

        SetHandler mod_cluster-manager

        Order deny,allow

        Deny from all

        Allow from all

    </Location>

        KeepAliveTimeout 60

        MaxKeepAliveRequests 0

        ManagerBalancerName mycluster

        AdvertiseFrequency 5

</VirtualHost>

and I performed the actions to configure Wildfly (WildFly 8 Cluster Howto - WildFly 9 - Project Documentation Editor), but I can't run test application on 10001 or 80 ports. Application run on 8080, 8230 and 8330 ports only.

[dima_kononov]

I change my-cluster.conf:

LoadModule slotmem_module modules/mod_slotmem.so

LoadModule manager_module modules/mod_manager.so

LoadModule proxy_cluster_module modules/mod_proxy_cluster.so

LoadModule advertise_module modules/mod_advertise.so

Listen *:80

<IfModule manager_module>

    Listen 10.19.4.102:10001

    ManagerBalancerName mybalancer

    MemManagerFile /var/cache/httpd

    <VirtualHost 10.19.4.102:10001>

        ServerName 10.19.4.102

        <Location /mod_cluster-manager>

            SetHandler mod_cluster-manager

            Order allow,deny

            Allow from all

        </Location>

        <Location / >

            Order allow,deny

            Allow from all

        </Location>

        KeepAliveTimeout 60

        MaxKeepAliveRequests 0

        AdvertiseFrequency 60

        AdvertiseSecurityKey secret

        AdvertiseGroup 224.0.1.105:23364

        EnableMCPMReceive

        ServerAdvertise on http://10.19.4.102:10001

        AllowDisplay On

        LogLevel debug

        ErrorLog "logs/mycluster_log"

    </VirtualHost>

</IfModule>

ProxyPreserveHost On

ProxyPass / balancer://mybalancer/

ProxyPassReverse / balancer://mybalancer

but I can,t open my application on 10001 port.

mycluster_log:

[Wed Aug 27 16:39:50 2014] [debug] mod_proxy_cluster.c(1010): update_workers_node starting

[Wed Aug 27 16:39:50 2014] [debug] mod_proxy_cluster.c(1025): update_workers_node done

[Wed Aug 27 16:40:00 2014] [debug] mod_manager.c(1910): manager_trans STATUS

[Wed Aug 27 16:40:00 2014] [debug] mod_manager.c(2618): manager_handler STATUS processing: "JVMRoute=subchik%3Aserver-three-subchik&Load=100"

[Wed Aug 27 16:40:00 2014] [debug] mod_manager.c(1625): Processing STATUS

[Wed Aug 27 16:40:00 2014] [debug] proxy_util.c(1964): proxy: ajp: retrying the worker for (10.19.4.46)

[Wed Aug 27 16:40:00 2014] [debug] proxy_util.c(1970): proxy: ajp: worker for (10.19.4.46) has been marked for retry

[Wed Aug 27 16:40:00 2014] [debug] proxy_util.c(2026): proxy: ajp: has acquired connection for (10.19.4.46)

[Wed Aug 27 16:40:00 2014] [debug] proxy_util.c(2082): proxy: connecting ajp://10.19.4.46:8259/ to 10.19.4.46:8259

[Wed Aug 27 16:40:00 2014] [debug] proxy_util.c(2209): proxy: connected / to 10.19.4.46:8259

[Wed Aug 27 16:40:00 2014] [debug] proxy_util.c(2460): proxy: ajp: fam 2 socket created to connect to 10.19.4.46

[Wed Aug 27 16:40:00 2014] [error] (13)Permission denied: proxy: ajp: attempt to connect to 10.19.4.46:8259 (10.19.4.46) failed

[Wed Aug 27 16:40:00 2014] [error] ap_proxy_connect_backend disabling worker for (10.19.4.46)

[Wed Aug 27 16:40:00 2014] [debug] mod_proxy_cluster.c(1361): proxy_cluster_try_pingpong: can't connect to backend

[Wed Aug 27 16:40:00 2014] [debug] proxy_util.c(2044): proxy: ajp: has released connection for (10.19.4.46)

[Wed Aug 27 16:40:00 2014] [debug] mod_proxy_cluster.c(2331): proxy_cluster_isup: pingpong ajp://10.19.4.46:8259/ failed

[Wed Aug 27 16:40:00 2014] [debug] mod_manager.c(2667): manager_handler STATUS  OK

If I run command

telnet 10.19.4.46 8259

I successful connect to 10.19.4.46

This is my mod_cluster-manager display:

what do I do wrong?

[rhusar]

I don't see anything obviously wrong. With this setup, the 10.19.4.102:10001 should only be receiving configuration commands from mod_cluster in WildFly, then on the 10.19.4.102:80 you should be able to access the application such as http://10.19.4.102/cluster-demo.

Always check your mod_cluster-manager page that the appropriate contexts are registered.

[rhusar]

Well, actually the httpd failed to connect to the backend WildFly server from the logs:

[Wed Aug 27 16:40:00 2014] [debug] mod_proxy_cluster.c(2331): proxy_cluster_isup: pingpong ajp://10.19.4.46:8259/ failed

Make sure there isn't a firewall blocking the traffic. Have you tried the telnet command from the machine that runs the httpd?

[dima_kononov]

I entered the next command

setsebool httpd_can_network_connect 1

and I connected to my application.

Thank you!