What is the proper way to allow the Vault to resolve hostnames?

Allowing the Vault to resolve hostnames can be accomplished effectively by adding an entry to the local hosts file on the vault server. This method provides a straightforward solution by enabling the operating system to map specific hostnames to designated IP addresses without relying on external DNS servers. When you add an entry to the local hosts file, you are ensuring immediate hostname resolution that the server can utilize directly, which is particularly useful in environments where DNS services may not be configured or available.

The local hosts file is typically used for quick overrides or to facilitate name resolution for internal resources. This can enhance security and operational reliability, as it minimizes dependency on external services.

Other methods, such as adding an entry to the DNS server or employing an external DNS provider, can also facilitate hostname resolution, but they come with their own complexities and dependencies. Changing firewall settings might influence network access but wouldn't resolve hostnames directly. Thus, using the local hosts file is a practical and efficient answer for hostname resolution within a CyberArk environment.