Axis RightFax 8.5 Guía de instalación descargar pdf (Pagina 36)

6-2

Installing Multiple Web Servers

Multiple web servers can be utilized to increase the performance of Oracle Transportation

Management. Generally, with more web servers you can maintain more simultaneous user connections

into the Oracle Transportation Management server’s web interface. You may also see increased

performance in integration, since incoming integration files are posted to a servlet on the web server

and are passed back to the application server.

Load Balancer

We recommend using a hardware load balancer to spread the incoming requests among multiple web

servers as efficiently as possible. The load balancer should be configured so that once a user logs into

a given web server, that same web server is always given back to that user within some configurable

time-period. After that time has elapsed, the web server given back to the user can once again be

determined by current load, after which the server returned should once again be fixed for a given

time-period. This is commonly referred to as a persistent or sticky session, and is usually

accomplished by inserting a cookie or other header into the request. It can also be done by IP

address, though this is a less desirable alternative. Exact configurations and options depend on the

load balancer in use.

Some load balancers can also be configured to dynamically remove a web server from the rotation if it

is down for whatever reason, and dynamically add it back in when it recovers. This is usually done by

having the load balancer attempt to connect to a specific URL on the web server every N seconds or

minutes, and there is a servlet provided to handle this specifically. Configure your load balancer to

load the glog.webserver.test.TestServlet servlet, e.g.:

http://www.company.com/GC3/glog.webserver.test.TestServlet

If the servlet loads properly and returns a response code of 200, then everything is fine. If any other

response code is given, or if a connection cannot be established, then that should be considered an

error condition and the server should be dropped out of rotation. Test out the URL manually with a

browser on a known-working system before using it to configure the load balancer; it should return

the word “OK” on the screen.

Diagnostic Screens

Oracle Transportation Management supports a number of diagnostic pages and processes that display

configuration information and monitor web-tier system health, including:

 Log browsing

 Properties management

 Cache monitoring

 JMS monitoring

 Scalability balancing

If the installation is customized to support application-tier scalability

, diagnostic screens are aware of

all web servers. That is, from a single browser request, the screens retrieve data across all web

servers.

In an installation with multiple web servers but a single application server – one without application-

tier scalability activated – the diagnostic screens can still be configured to retrieve and report on data

across all web servers. To accomplish this, the installation must inform the application server and each

See the Application Scalability Guide for more information on this configuration.

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Axis RightFax 8.5 Guía de instalación Pagina 36

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