How do you set up an Envoy listener?

Setting up an Envoy listener involves configuring an address and port through which Envoy can accept incoming traffic, along with applying filters to manage and manipulate that traffic. The listener is a crucial component in Envoy's architecture, enabling it to receive HTTP or TCP requests.

When defining a listener, you typically specify parameters such as the socket address (which includes the IP address and port number) and the filters that dictate how traffic is processed (for example, authentication, logging, and routing filters). This configuration allows Envoy to manage requests effectively and apply the desired policies for that traffic.

The other options do not pertain to setting up a listener in Envoy. Direct connections to a database or establishing firewall rules involve different processes unrelated to the listener's core setup. Deploying additional servers pertains to infrastructure scaling rather than configuring a singular listener instance within Envoy. Thus, focusing on filters and address/port configuration is the correct approach for setting up an Envoy listener.