This creates a new public-private key pair with an alias of "synthetic-server". You can use any value you like for the alias. The "first and last name" required during the installation process becomes the common name (CN) of the certificate. Use the name of the server.
Configure the keystore by entering the information requested at the command prompt.
Specify a password for the keystore. You need to configure this password in the Synthetic Server configuration file later.