Running Multiple Instances of Laravel Horizon on the Same Server

Original - Sep 23, 2019 -1 Minute Read

If you're like me you tend to have a staging and production instance of your code on the same server. Recently I've been running into an issue where my Laravel Horizon queues were not processing when I had multiple instances of Horizon on the same server. Here's how I fixed that issue:

In your config/horizon.php file you'll need to create a new environment for your staging environment. There should be one for local and production already but nothing for staging. Create that

 'staging' => [
  'supervisor-staging' => [
    'connection' => 'redis',
    'queue' => ['queue.staging'],  // Use a unique name for your staging queue
    'balance' => 'simple',
    'processes' => 3,
    'tries' => 3
  ],

Once that is done we'll want to use a different Redis database than our production application uses so we don't have any collisions with the queues. Head over to your config/database.php file and add some values under the redis option.

'options' => [
  'prefix' => env('REDIS_PREFIX', 'prod:')
],

The last step is to edit your .env file and add some references to your staging queues. You'll need to define a REDIS_QUEUE key/value pair as well as some other key/value pairs for Redis.

REDIS_QUEUE=queue.staging

HORIZON_PREFIX="staging:"
REDIS_PREFIX="staging:"
REDIS_DB=2

That should be all you need to separate your Laravel Horizon instances on the same server.