7.2. Configure a load-balancing proxy using the HTTP Connector
Task: Configure a Proxy Server Listener
- An installed Web Server distribution, such as JBoss Enterprise Web Server or HPWS installed (designated by HTTPD_HOME in this documentation).
- JBoss HTTP Connector modules. Refer to Chapter 6, Install proxy server components for details.
Create a listen directive for the proxy serverEdit the configuration file
HTTPD_HOME/httpd/conf/JBoss_HTTP.confand add the following:
Listen IP_ADDRESS:PORT_NUMBERWhere IP_ADDRESS is the IP address of a server network interface to communicate with the worker nodes, and PORT_NUMBER is the port on that interface to listen on.
NoteThe port PORT_NUMBER must be open on the server firewall for incoming TCP connections.
Example 7.1. Example Listen Directive
Create Virtual HostAdd the following <VirtualHost> block to
<VirtualHost IP_ADDRESS:PORT_NUMBER> <Location /> Order deny,allow Deny from all Allow from PARTIAL_IP_ADDRESS </Location> KeepAliveTimeout 60 MaxKeepAliveRequests 0 ManagerBalancerName mycluster AdvertiseFrequency 5 </VirtualHost>IP_ADDRESS and PORT_NUMBER match the values from the Listen directive.PARTIAL_IP_ADDRESS is the first 1 to 3 bytes of an IP address, to restrict access to a specific subnet - 10.33.144, for example.
Configure SELinux to allow proxy trafficEnter the following commands as a root-equivalent user to modify the SELinux configuration to allow the proxy traffic:
#semanage port -a -t http_port_t -p tcp 8079 #add port to the Apache port list to enable the next command to work #setsebool -P httpd_can_network_relay 1 #for mod_proxy to work
Optional: Disable Server AdvertisementThe presence of the
AdvertiseFrequencydirective, which is set to five seconds here, causes the server to periodically send server advertisement messages via UDP multicast.These server advertisement messages contain the IP_ADDRESS and PORT_NUMBER specified in the VirtualHost definition. Worker nodes that are configured to respond to server advertisements use this information to register themselves with the proxy server.To disable server advertisement, add the following directive to the
ServerAdvertise OffIf server advertisements are disabled, or UDP multicast is not available on the network between the proxy server and the worker nodes, you must configure worker nodes with a static list of proxy servers. Refer to Section 9.1, “Static proxy configuration” for directions.
Restart the JBoss Enterprise Web Server Apache serviceRefer to HTTPD-specific documentation for detailed instructions.