mkdir /etc/mysql/
openssl rand -hex 16 >> /etc/mysql/keys.txt
openssl rand -hex 16 >> /etc/mysql/keys.txt
openssl rand -hex 16 >> /etc/mysql/keys.txt
vi /etc/mysql/keys.txt // Here I add "1;", "2;" and "3;"
openssl enc -aes-256-cbc -md sha1 -k MY_PASSWORD_HERE -in /etc/mysql/keys.txt -out /etc/mysql/keys.enc
vi /etc/my.cnf

I add these lines :
[mariadb]
innodb-encrypt-tables
innodb-encrypt-log
innodb-encryption-threads = 4
plugin-load-add=file_key_management
file_key_management_filename=/etc/mysql/keys.txt
file_key_management_encryption_algorithm=AES_CTR
# for monitoring
innodb-tablespaces-encryption

service mysql restart