How to configure vault server to encrypt data on percona for mysql

I am trying to configure a Percona server for mysql to encrypt the data using keyring _vault_plugin.
I followed the instructions of this link:

https://www.percona.com/doc/percona-…ncryption.html

but when creating a table:

CREATE TABLE t1 (c1 INT, PRIMARY KEY pk (c1)) ENCRYPTION = ‘KEYRING’ ENCRYPTION_KEY_ID = 1;

I get the following error:
“Seems that keyring is down. It is not possible to create encrypted tables without keyring. Please install a keyring and try again.”

How can I configure the keyring in the vault server in order to encrypt the data in percona