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Extension: Controlling Server Selection
Sometimes you may prefer your customers to access a certain server for certain traffic types.
However, if that server fails, they still require redundancy to an alternate server.
This section shows how to configure this. The example gives you control over server
selection for SFTP (Secure File Transfer Protocol) traffic, while providing server redundancy if
the preferred server fails. In this example, SFTP favours the first resource only (192.168.1.1).
It only uses the second resource if the first resource fails.
The load balancers use pings to monitor the health of each resource. When the primary
resource fails, this triggers a script to enable the secondary resource.
To provide this solution, you need to add the following steps:
•
Configure Load Balancing: Extra Commands
•
Configure the Triggers: Extra Commands
•
Modify the Scripts
•
Create New Scripts
Configure Load Balancing: Extra Commands
This section describes the commands you need to add to step 8 on
balancer 1 and
SFTP traffic as well as web traffic.
Add a resource pool for SFTP.
Add both SFTP resources to the SFTP resource pool. Note that SFTP is FTP encapsulated by
SSHv2 on port 22.
Disable SFTP2. This forces the load balancer to use SFTP1, which is the desired behaviour
because SFTP1 is the preferred server. Later in this configuration, we will create a trigger so
that the load balancer changes to SFTP2 if SFTP1 goes down.
Add and enable the Virtual Balancer for SFTP traffic.
Note that affinity is turned off. If resource 1 fails, this stops new connections from
automatically trying to use the failed resource.
Configure Load Balancer Redundancy on Allied Telesis Routers and Switches
page 8
for load balancer 2. These extra commands make load balancing act on
add lb respool=sftp selectmethod=roundrobin faillast=no
add lb resource=sftp1
add lb resource=sftp2
disable lb resource=sftp2 immediately
add lb virtualbalancer=sftp publicip=172.214.1.2 publicport=22
respool=sftp affinity=no
enable lb virtualbalancer=sftp
ip=192.168.1.1 port=22 respool=sftp
ip=192.168.1.2 port=22 respool=sftp
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