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# Server Cluster/External Web Server Configuration

The server cluster/external Web server configuration distributes client connections evenly among any number of nodes, based on Web traffic and server load. This configuration is typically used for organizations that need to load-balance Web traffic across multiple nodes (as an alternative to hardware-based load balancing). It can also be useful to an organization that already uses a standard Web server within its network infrastructure.

You can usually improve user load, transaction capacity, and system performance with this configuration. The extent of improvement depends on the number of nodes in the cluster and their available resources. This configuration supports load balancing and server failover features.

Server cluster/external Web server configuration

The Web server (internal or external) listens for HTTP or HTTPS requests from standard web browser clients and workbench interface clients. Nodes run in the background and are transparent to users. Users access only the URL to the Web server.

The Web server forwards HTTP or HTTPS requests to one of the nodes. The PPM Web server and the nodes communicate using Apache JServ Protocol version 1.3 (AJP13).

The PPM Server uses JDBC to communicate with the Oracle database.

The nodes also accept TCP/UDP connections from other nodes for cache synchronization and cluster monitor.

### Software Load Balancing

You can use the OpenText PPM Web server module as the software load balancer for a PPM Server cluster configuration. For this configuration, we recommend that OpenText PPM nodes in the cluster not accept HTTP requests that are not routed through the Web server.

The request sequence is as follows:

1. A user submits an HTTP request to the Web server.

2. The web server forwards the request to the PPM web server module.

3. The PPM web server module sends the request to a PPM Server.

### Integrate with a Single Sign-On product

For instructions on how to implement single sign-on with OpenText PPM, see Implement user authentication.

### Use SSL accelerators

For PPM Server cluster configurations running HTTPS, you must integrate an external Web server that supports the appropriate accelerator to leverage a hardware-based SSL accelerator.

The external Web server and PPM Servers communicate using AJP13, a proprietary protocol that can be more efficient than HTTP for communicating with PPM Servers using an external Web server. For information about how to set up a server cluster with an external Web server, see Advanced system configuration.

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