Laravel connect multiple database server

#laravel

Replication database in mariadb and set Database Read-only | mariadb-replication-easy-step

set up Laravel connect multiple database server | Read & Write Connections

# config/database.php
'mysql' => [
    'read' => [
        'host' => [ '192.168.1.1', '196.168.1.2' ],
    ],
    'write' => [
        'host' => ['196.168.1.2'],
    ],
    'sticky'    => true,
    ...
],

Check, What's Laravel connect server database id.

Route::get('/mysql-test', function () {
  $places = App\Place::all();
  $results = DB::select( DB::raw("SHOW VARIABLES LIKE 'server_id'") );  
  return "Server ID: " . $results[0]->Value;
});