Connect to MySQL and create a Metron REST database:

mysql -uroot -p
CREATE DATABASE IF NOT EXISTS metronrest;

Create a Metron user in MySQL with a password, then apply database access permission to the Metron user:

CREATE USER 'metron'@'$REST_HOST' IDENTIFIED BY 'Myp@ssw0rd';
GRANT ALL PRIVILEGES ON metronrest.* TO 'metron'@'$REST_HOST';

$REST_HOST is the host on which the REST application is installed.

Be sure to save your user name and password for later use.

Create user and authorities tables:

use metronrest;
create table if not exists users(
 username varchar(50) not null primary key,
 password varchar(50) not null,
 enabled boolean not null
);
create table authorities (
 username varchar(50) not null,
 authority varchar(50) not null,
 constraint fk_authorities_users foreign key(username) references
 users(username)
);
create unique index ix_auth_username on authorities (username,authority);

Add one or more users to the REST application:

use metronrest;
insert into users (username, password, enabled) values ('your_username', 'your_password',1);
insert into authorities (username, authority) values ('your_username', 'ROLE_USER');

Exit MySQL:

quit

Install the appropriate MySQL client library for your version of MySQL. For example:

cd $METRON_HOME/lib
wget https://dev.mysql.com/get/Downloads/Connector-J/mysql-connector-java-5.1.41.tar.gz
tar xf mysql-connector-java-5.1.41.tar.gz

To add additional users:

use metronrest;
insert into users (username, password, enabled) values ('your_username',
'your_password',1);
insert into authorities (username, authority) values ('your_username',
 'ROLE_USER');
commit;