Barracuda Networks Load Balancer, Руководство администратора

Страница: 45 / 76

Managing the Barracuda Load Balancer 45
application that uses a wide range of ports. Otherwise, you would have to configure a
Service for each port.
Note : When ALL is selected, the Service Monitor Default Test uses Ping instead of a
TCP port check to determine if a Real Server is up or down.
• Real Servers . The IP address(es) of the Real Servers that host the load-balanced
application or Service. Each IP address needs to be entered on a separate line.
2.
Click
Add
.
If the creation of the Service is successful, the Service name appears on the
Basic > Services
page
with a green, orange, or red health indicator next to it.
If you have a Service that uses SSL but you do not want the Barracuda Load Balancer to perform SSL
offloading, then you must either:
Create a Service with Port ALL , or
Create two Services, one with Port 80 (HTTP port) and the other with Port 443 (SSL port).
Either of these options will require the Barracuda Load Balancer to listen for both SSL and HTTP
traffic. In addition, the
Service Persist Type must be Layer 4 (Client IP). Finally, Persist (Seconds)
must match the time that the application is configured for persistence so as to ensure that the session
does not time out before the application has responded.
To configure advanced settings for a Service, click
Edit
next to the Service. Some common reasons
to configure advanced settings include:
• If you want to specify a Last Resort Server, which is the server to which all traffic for this
Service is routed in the event that none of the associated Real Servers are available.
• If you want the Barracuda Load Balancer to automatically reactivate a Real Server that
was previously not available. If you set the Auto-Recover field to No, then you will have
to use the
Basic > Health
page to manually enable any Real Server that goes offline.
• If you want to change the Scheduling Policy.
• If you want to change the Testing Method used by the Service Monitor to determine the
availability of the Real Servers.
• If you want to configure Session Persistence, including persistence based on Client IP,
Layer 7 - HTTP cookie, and Session Directory Integration.
• If you want to enable SSL offloading for the Service.
• If you want to enable the Intrusion Prevention System.
• If you want to limit access to the Service to only clients with IP addresses within a certain
range.
Detailed descriptions of the settings are available in the online help. Click Save Changes after
making any modifications to the Service Detail
.
3.
To configure advanced settings for a Real Server, click
Edit
next to the Real Server. From this
page, you can:
• Enable or disable the server. Real Servers should be disabled when performing server
maintenance.
• Change the weight of this Real Server to be used when assigning client connections.
Values are applied as a ratio against weights of all other Real Servers for this Service. For
example, a Real Server with weight of 50 will get half the amount of traffic as a Real
Server with a weight of 100, but will get twice that of a Real Server with a weight of 25.
• Specify if the Real Server is using Direct Server Return.
• Change or execute the Testing Method for the Real Server.
Click
Save Changes
after making any modifications to this page.