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Adding Servers to the Load Balancing Group
Once a logical server group is created, you specify the servers that can handle client
requests. When the IA receives a client request directed to the virtual server address, it
redirects the request to the actual server address and port. Server selection is done
according to the specified policy.
To add servers to the server group, enter the following command in Configure mode:
Add load balancing servers to a
specific server group.
Add range of load balancing
servers to a range of server
groups.
Optional Group or Server Operating Parameters
There are several commands you can specify that affect the operating parameters of
individual servers or the entire group of load balancing servers. In many cases, there are
default parameter values and you only need to specify a command if you wish to change
the default operation. For example, you can specify the policy to be used for distributing
the workload for a group of load balancing servers. By default, the IA assigns sessions to
servers in a round-robin (sequential) manner.
Specifying Load Balancing Policy
The default policy for distributing workload among the load balancing servers is round-
robin, where the IA selects the server on a rotating basis without regard to the load on
individual servers. Other policies can be chosen for the group, including least loaded,
where the server with the fewest number of sessions bound to it is selected to service a
new session. The weighted round robin policy is a variation of the round-robin policy,
where each server takes on new sessions according to its assigned weight. If you choose
the weighted round robin policy, you must assign a weight to each server that you add to
the load balancing group.
To specify the load balancing policy, enter the following command in Configure mode:
Specify load balancing policy.
Note:
These policies only affect groups created with the parameter protocol tcp; groups
created with the parameter protocol udp are load-balanced using a fixed IP-hash
policy.
Internet Appliance User Reference Manual
Chapter 12: Web Hosting Configuration Guide
load-balance add host-to-group
<ipaddr/range>
group-name
<port number> [
port
load-balance add host-to-vip-range
vip-range-name
number> [
weight
load-balance set policy-for-group
name>
<policy>
policy
<group name>
<weight>
weight
]
<range>
<range name>
<port
port
<weight>
]
<group
197
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