首先，你需要将两个MySQL和MariaDB实例的配置文件分别修改为以下内容：

对于MySQL 5实例：

        
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[mysqld]
basedir=/usr/local/mysql
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
pid-file=/var/run/mysqld/mysqld.pid
port=3306
user=mysql
log_error=/var/log/mysql/error.log
log_output=/var/log/mysql/output.log

    

对于MariaDB 10实例：

        
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[mariadb]
basedir=/usr
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
pid-file=/var/run/mariadb/mariadb.pid
port=3306
user=mysql
log_error=/var/log/mysql/error.log
log_output=/var/log/mysql/output.log

    

然后，将这两个配置文件分别拷贝到/etc/init.d/aaa和/etc/init.d/bbb。

接下来，你需要编辑这两个服务文件，添加启动命令。在/etc/init.d/aaa中添加以下内容：

        
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#!/bin/sh
### BEGIN INIT INFO
# Provides:         aaa
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Start daemon at boot time
# Description:       Enable service provided by daemon.
### END INIT INFO

PATH=/sbin:/bin:/usr/sbin:/usr/bin
DAEMON=/usr/local/mysql/bin/mysqld_safe
NAME=mysql
DESC=mysqld

test -x "$DAEMON" || exit 0

case "$1" in
	start)
		echo -n "Starting $DESC: "
		$DAEMON --defaults-file=/etc/my.cnf &> /dev/null
		if [ $? -eq 0 ]; then
			echo "OK"
		else
			echo "FAILED"
		fi
	;;
	stop)
		echo -n "Stopping $DESC: "
		killall -q $NAME
		if [ $? -eq 0 ]; then
			echo "OK"
		else
			echo "FAILED"
		fi
	;;
	*)
		echo "Usage: $0 {start|stop}"
		exit 1
esac

exit 0

    

在/etc/init.d/bbb中添加以下内容：

        
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#!/bin/sh
### BEGIN INIT INFO
# Provides:         bbb
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Start daemon at boot time
# Description:       Enable service provided by daemon.
### END INIT INFO

PATH=/sbin:/bin:/usr/sbin:/usr/bin
DAEMON=/usr/bin/mysqld_safe
NAME=mariadb
DESC=mariadb

test -x "$DAEMON" || exit 0

case "$1" in
	start)
		echo -n "Starting $DESC: "
		$DAEMON --defaults-file=/etc/mysql/my.cnf &> /dev/null
		if [ $? -eq 0 ]; then
			echo "OK"
		else
			echo "FAILED"
		fi
	;;
	stop)
		echo -n "Stopping $DESC: "
		killall -q $NAME
		if [ $? -eq 0 ]; then
			echo "OK"
		else
			echo "FAILED"
		fi
	;;
	*)
		echo "Usage: $0 {start|stop}"
		exit 1
esac

exit 0

    

最后，给这两个服务文件添加可执行权限：

        
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chmod +x /etc/init.d/aaa /etc/init.d/bbb

    

现在，你可以使用以下命令来启动和停止这两个服务：

        
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sudo /etc/init.d/aaa start
sudo /etc/init.d/aaa stop
sudo /etc/init.d/bbb start
sudo /etc/init.d/bbb stop
注意：端口不能冲突，否则只能启动一个。