Running Multiple Instances of Laravel Horizon on the Same Server

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.

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