Install multiple MySQL clusters on same machine - CentOS 7 - mysql

Question

I am new to MySQL and i'm trying to create multiple mysql clusters on the same host with different port number. I know that default port is 3306 so I tried to configure the my.cnf to something like this:
[mysqld2]
datadir=/var/lib/mysql2
port=3307
and then run mysql -P 3307 but that doesn't work. I don't know how to start the cluster on this port.
Please send help :)
Edit:
So i found out I need to create another configuration file and made it to here:
mkdir -p /var/lib/mysql2
chmod --reference /var/lib/mysql /var/lib/mysql2
chown --reference /var/lib/mysql /var/lib/mysql2
cp -p /etc/my.cnf /etc/my2.cnf
vi /etc/my2.cnf
--------------------------------------
[mysqld]
datadir=/var/lib/mysql2
socket=/var/lib/mysql/mysql2.sock
port=3337
[mysqld_safe]
log-error=/var/log/mysqld2.log
pid-file=/var/run/mysqld/mysqld2.pid
--------------------------------------
mysqld --initialize-insecure --user=mysql --datadir=/var/lib/mysql2
Now I have a new data directory set and a configuration file, problem is I don't know how to start this specific cluster(with this configuration file I made)
Edit2:
Now when I run mysqld --defaults-file=/etc/my2.cnf i get this error:
[root#pg66 ~]# mysqld --defaults-file=/etc/my2.cnf
2020-12-31T09:50:08.821792Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.22) starting as process 28085
2020-12-31T09:50:08.838198Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.
2020-12-31T09:50:09.551655Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended.
2020-12-31T09:50:10.670160Z 0 [ERROR] [MY-011292] [Server] Plugin mysqlx reported: 'Preparation of I/O interfaces failed, X Protocol won't be accessible'
2020-12-31T09:50:10.670328Z 0 [ERROR] [MY-011300] [Server] Plugin mysqlx reported: 'Setup of bind-address: '*' port: 33060 failed, `bind()` failed with error: Address already in use (98). Do you already have another mysqld server running with Mysqlx ?'
2020-12-31T09:50:10.670440Z 0 [ERROR] [MY-013597] [Server] Plugin mysqlx reported: 'Value '*' set to `Mysqlx_bind_address`, X Plugin can't bind to it. Skipping this value.'
2020-12-31T09:50:10.670592Z 0 [ERROR] [MY-011300] [Server] Plugin mysqlx reported: 'Setup of socket: '/var/run/mysqld/mysqlx.sock' failed, another process with PID 26783 is using UNIX socket file'
2020-12-31T09:50:11.007743Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed.
2020-12-31T09:50:11.007904Z 0 [System] [MY-013602] [Server] Channel mysql_main configured to support TLS. Encrypted connections are now supported for this channel.
2020-12-31T09:50:11.063486Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: ready for connections. Version: '8.0.22' socket: '/var/lib/mysql/mysql2.sock' port: 3337 MySQL Community Server - GPL.
^C^C^[[A^C

Answer 1

you need to launch mysql with your config file.
mysqld_safe – -defaults-file=/etc/my2.cnf && mysqld_safe – -defaults-file=/etc/my1.cnf
More infos: https://dev.mysql.com/doc/refman/8.0/en/multiple-servers.html