In general, an NSX Advanced Load Balancer GSLB service has only one FQDN configured. When multiple FQDNs represent the same GSLB service, wildcard for these domains is configured on NSX Advanced Load Balancer.
Use Case
A wildcard match for FQDNs is configured to fulfill the following requirements:
foo.com is the subdomain delegated to NSX Advanced Load Balancer
t1.test.finance.foo.com, t2.test.finance.foo.com, m1.test.finance.foo.com, etc. point to the same application or front end the same application
To achieve the above requirements, add a GSLB service for test.finance.foo.com and enable the wildcard option to indicate that any FQDN matching *.test.finance.foo.com go to the same set of applications.
Configuring Wildcard Match using NSX Advanced Load Balancer CLI
Login to the NSX Advanced Load Balancer CLI and use configure gslbservice <gslb service name> command to enable the wildcard_match flag.
[admin:10-10-25-10]:configure gslbservice gsvc-5 [admin:10-10-25-10]: > TAB wildcard_match Enable wildcard match of FQDN: If an exact match is not found in the DNS table, the longest match is chosen by wildcarding the FQDN in the DNS request. Default is false. [admin:10-10-25-10]: gslbservice> wildcard_match Overwriting the previously entered value for wildcard_match [admin:10-10-25-10]: gslbservice> save
The above is supported only using the CLI.
Similarly, static DNS records may be identified by wildcard as well.
[admin:10-10-25-10]: virtualservice:static_dns_records> wildcard_match Enable wild-card match of FQDN: If an exact match is not found in the DNS table, the longest match is chosen by wildcarding the FQDN in the DNS request. Default is false. [admin:10-10-25-10]: virtualservice:static_dns_records> save
Scenario 1
subdomain name is foo.com
The app domain name is demo.foo.com
The wildcard option to meet the above requirement is to use *.demo.foo.com as the wild card option as shown below:
[admin:testcontroller-2]: > configure gslbservice gs1 [admin:testcontroller-2]: gslbservice> domain_names demo.foo.com [admin:testcontroller-2]: gslbservice> wildcard_match Overwriting the previously entered value for wildcard_match [admin:testcontroller-2]: gslbservice> save
domain_names : demo.avi.com: This app domain name can be configured from GUI as well
gslbservice> wildcard_match: Flag for enabling wildcard
Scenario 2: Wildcard for the subdomain itself
If it is required to have a wildcard for the subdomain itself i.e. *.foo.com, configure the app domain name from the NSX Advanced Load Balancer CLI and enable wildcard match on the same as shown below.
[admin:testcontroller-2]: > configure gslbservice gs1 [admin:testcontroller-2]: gslbservice> domain_names foo.com [admin:testcontroller-2]: gslbservice> wildcard_match Overwriting the previously entered value for wildcard_match [admin:testcontroller-2]: gslbservice> save
App domain name: foo.com
A domain name like this can not be configured using the NSX Advanced Load Balancer UI.
Configuring DNS Static Records
