[root@bc1b8047d3c0 etc]# mysqld_multi report 

Reporting MariaDB servers

MariaDB server from group: mysqld2 is not running

MariaDB server from group: mysqld3 is not running

[root@bc1b8047d3c0 etc]# mysqld_multi start 2

[root@bc1b8047d3c0 etc]# mysqld_multi start 3

[root@bc1b8047d3c0 farm]# mysqld_multi report 

Reporting MariaDB servers

MariaDB server from group: mysqld2 is running

MariaDB server from group: mysqld3 is running

[root@bc1b8047d3c0 etc]# top -cb |grep [m]ysqld

  798 root      20   0   11828   2720   2388 S   0.0  0.0   0:00.00 /bin/sh /usr/bin/mysqld_safe --socket=/a/m1-10.2.16/dt/my.sock --port=3307 --pid_file=/a/m1-10.2.16/dt/p.id --datadir=/a/m1-10.+

  880 root      20   0 1779240  97720  18388 S   0.0  0.3   0:00.20 /usr/sbin/mysqld --basedir=/usr --datadir=/a/m1-10.2.16/dt --plugin-dir=/usr/lib64/mysql/plugin --user=root --log-error=/a/m1-10.2+

  916 root      20   0   11828   2836   2500 S   0.0  0.0   0:00.00 /bin/sh /usr/bin/mysqld_safe --socket=/a/m0-10.3.8/dt/my.sock --port=3306 --pid-file=/a/m0-10.3.8/dt/p.id --datadir=/a/m0-10.3.+

  998 root      20   0 1779240  97764  18416 S   0.0  0.3   0:00.19 /usr/sbin/mysqld --basedir=/usr --datadir=/a/m0-10.3.8/dt --plugin-dir=/usr/lib64/mysql/plugin --user=root --log-error=/a/m0-10.3.+

root@27b421b34a0a:/a/m1-10.2.15# mysqld_multi report

Reporting MariaDB servers

No groups to be reported (check your GNRs)

root@27b421b34a0a:/a/m1-10.2.15# cat /etc/issue

Debian GNU/Linux 9 \n \l