:_mod-docs-content-type: CONCEPT

Configures bootstrap service settings for listeners.

Example configuration for the `host`, `nodePort`, `loadBalancerIP`, and `annotations` properties is shown in the xref:type-GenericKafkaListenerConfiguration-reference[`GenericKafkaListenerConfiguration` schema] section.

[id='property-listener-config-altnames-{context}']
= Specifying alternative bootstrap addresses

To specify alternative names for the bootstrap address, use the `alternativeNames` property.
This property is applicable to all types of listeners.
The names are added to the broker certificates and can be used for TLS hostname verification.

.Example `route` listener configuration with additional bootstrap addresses
[source,yaml,subs="attributes+"]
----
listeners:
  #...
  - name: external1
    port: 9094
    type: route
    tls: true
    configuration:
      bootstrap:
        alternativeNames:
          - example.hostname1
          - example.hostname2 
# ...
----