1. .env

DB_CONNECTION=mysql
#DB_HOST=127.0.0.1
DB_PORT=3306
DB_DATABASE=laravel_db
DB_USERNAME=larave_user
DB_PASSWORD=Laravel_Pa55word_here!

2. config/database.php

'mysql' => [
	    'read' => [
	        'host' => [
	            '157.230.25.155',
	        ],
	    ],
	    'write' => [
	        'host' => [
        	    '139.59.155.119',
	         ],
	    ],	
    

3. Controller

DB::connection('mysql::write')->select(...);

Or 

User::on('mysql::write')->find(1);
User::on('mysql::read')->get();
User::on('mysql::read')->all();

or

User::on('mysql::read')->find(1);