Configuring Apache as a Load Balancer for EIS Back End

When used as a load balancer for the EIS back end, some of the configuration file settings are different.

If the load balancer connects to SAP Data Orchestration Engine – DOE to load balancer to Unwired Platform cluster to device – use the settings below in place of the corresponding settings in Configuring Apache 2.2 as a Load Balancer.
Add the lines below to the Apache Web Server configuration file (httpd.conf). Replace terms in italics with actual values in your environment:
- DOE_cluster – DOE cluster ID
- US#_IP – IP address for Unwired Server #
- US#_node – node name for Unwired Server #
- US#_port – port number for Unwired Server #
```
    ProxyPass / balancer://DOE_cluster/ stickysession=JSESSIONID
    ProxyPassReverse / http://US1_srvr:US1_port/doe/publish
    ProxyPassReverse / http://US2_srvr:US2_port/doe/publish
    <Proxy balancer://DOE_cluster>
      BalancerMember http://US1_srvr:US1_port/doe/publish route=US1_node
      BalancerMember http://US2_srvr:US2_port/doe/publish route=US2_node
```
Extend the example above to any number of Unwired Servers by adding them to the ProxyPassReverse and BalancerMember lists.
If the load balancer connects to SAP MobileGateway – MobileGateway to load balancer to Unwired Platform cluster to device – use the settings below in place of the corresponding settings in Configuring Apache 2.2 as a Load Balancer.
Add the lines below to the Apache Web Server configuration file (httpd.conf). Replace terms in italics with actual values in your environment:
- DOE_cluster – DOE cluster ID
- US#_IP – IP address for Unwired Server #
- US#_node – node name for Unwired Server #
- US#_port – port number for Unwired Server #
Note: The only difference in the settings below, relative to the settings above, is the omission of "/doe/publish" in the references to Unwired Server instances.
```
    ProxyPass / balancer://DOE_cluster/ stickysession=JSESSIONID
    ProxyPassReverse / http://US1_srvr:US1_port
    ProxyPassReverse / http://US2_srvr:US2_port
    <Proxy balancer://DOE_cluster>
      BalancerMember http://US1_srvr:US1_port route=US1_node
      BalancerMember http://US2_srvr:US2_port route=US2_node
```
Extend the example above to any number of Unwired Servers by adding them to the ProxyPassReverse and BalancerMember lists.