Hostname Field for GSLB Pool Member

NSX Advanced Load Balancer supports the configuration of a hostname field for GSLB pool members. If configured, this field is used as the host header in GSLB HTTP and HTTPS health monitor. CNAME/FQDN is used in the GSLB monitor if the hostname field is not configured.

Configuring hostname field using NSX Advanced Load Balancer CLI

Log in to the NSX Advanced Load Balancer CLI and use the hostname <hostname_string> command under select gslbservice mode to use the hostname for the GSLB monitor for the desired GSLB service.

1. The detailed steps are mentioned below:

   [admin:ctlr-1]: > configure gslbservice <gslb service name>

2. Identify pool (group) index using where command:

   [admin:ctlr-1]: gslbservice> where
   
   ------------------------------------------------------------------------------------+
   
   Field
   
   Value
   
   ------------------------------------------------------------------------------------+
   
   uuid gslbservice-ebdd873c-85e8-41d5-be5d-7f0145c68831
   
   name gs1
   
   domain_names[1] abcd.com
   
   groups[1]
   
   name  gs1-pool
   
   priority 9
   
   algorithm GSLB_ALGORITHM_ROUND_ROBIN
   
   members[1]
   
   ip 10.140.61.13
   
   ratio 1
   
   enabled True
   
   hostname  xyz
   
   enabled True
   
   down_response
   
   type GSLB_SERVICE_DOWN_RESPONSE_NONE
   
   health_monitor_refs[1] System-GSLB-HTTPS
   
   controller_health_status_enabled True

   In the above example, 1 is the index value for gs-pool1.

3. Use the group index command to select the desired pool.

   [admin:ctlr-1]:gslbservice> groups index <pool_index>

4. Identify pool member index using where command:

   [admin:ctlr-1]:gslbservice:groups> where
   
    ----------------------------------------+
   
    Field
   
    Value
   
    ----------------------------------------+
   
    name  gs1-pool
   
    priority 9
   
    algorithm GSLB_ALGORITHM_ROUND_ROBIN
   
    members[1]
   
    ip 10.140.61.13
   
    ratio 1
   
    enabled True
   
    hostname xyz
   
    enabled True
   
    ----------------------------------------+

   In the above example, the pool member(10.140.61.13) index is 1.

5. Select pool member using the index value.

   [admin:ctlr-1]:gslbservice:groups> members index <pool_memeber_index>

6. Configure hostname once the pool member is selected.

   [admin:ctlr-1]:groups:members> hostname <hostname_string>

7. Save the configuration (pool member configuration).

   [admin:ctlr-1]:groups:members>save pool -> save gslbservice

Note:

In NSX Advanced Load Balancer, SNI extension is also supported for GSLB HTTPS health monitor. In this method, the hostname is used as the server name. If the hostname is not configured, CNAME or FQDN is used for the health monitor.