Run gpg to generate a new key
$ gpg --gen-key
Answer questions:
Enter a passphrase
Use gpg to confirm you now have the new key stored in the keyring:
gpg --list-secret-keys --keyid-format LONG
Results:
/root/.gnupg/secring.gpg ------------------------ sec 2048R/4E6660E79D2BCFD5 2017-10-25 uid Jay C. Everson (None) <jeverson@techmentor.com> ssb 2048R/C1B6E02B5116D297 2017-10-25