laravel-websockets/docs/horizontal-scaling/getting-started.md

title	order
Getting Started	1

When running Laravel WebSockets without additional configuration, you won't be able to scale your servers out.

For example, even with Sticky Load Balancer settings, you won't be able to keep track of your users' connections to notify them properly when messages occur if you got multiple nodes that run the same websockets:serve command.

The reason why this happen is because the default channel manager runs on arrays, which is not a database other instances can access.

To do so, we need a database and a way of notifying other instances when connections occur.

For example, Redis does a great job by encapsulating the both the way of notifying (Pub/Sub module) and the storage (key-value datastore).

Configure the replication

To enable the replication, simply change the replication.driver name in the websockets.php file:

'replication' => [

    'driver' => 'redis',

    ...

],

The available drivers for replication are:

• Redis

Configure the Broadcasting driver

Laravel WebSockets comes with an additional websockets broadcaster driver that accepts configurations like the Pusher driver, but will make sure the broadcasting will work across all websocket servers:

'connections' => [
    'pusher' => [
        ...
    ],

    'websockets' => [
        'driver' => 'websockets',
        'key' => env('PUSHER_APP_KEY'),
        'secret' => env('PUSHER_APP_SECRET'),
        'app_id' => env('PUSHER_APP_ID'),
        'options' => [
            'cluster' => env('PUSHER_APP_CLUSTER'),
            'encrypted' => true,
            'host' => env('PUSHER_APP_HOST', '127.0.0.1'),
            'port' => env('PUSHER_APP_PORT', 6001),
            'scheme' => env('PUSHER_APP_SCHEME', 'http'),
            'curl_options' => [
                CURLOPT_SSL_VERIFYHOST => 0,
                CURLOPT_SSL_VERIFYPEER => 0,
            ],
        ],
    ],

Make sure to change the BROADCAST_DRIVER:

BROADCAST_DRIVER=websockets

Now, when your app broadcasts the message, it will make sure the connection reaches other servers which are under the same load balancer.