Demo for Horizon Issue

1. create a laravel project

# This is taken from https://serversideup.net/open-source/spin/examples/laravel
docker run --rm -e "S6_LOGGING=1" -v $(pwd):/var/www/html serversideup/php:8.1-fpm composer create-project laravel/laravel example-app

2. install horizon

# cd into example app folder
cd example-app
# require horizon
composer require laravel/horizon
# install horizon
php artisan horizon:install

3. Spin 😉 the containers up

docker-compose up -d --build

Now the issue

The issue really is: if you bash into the container everything works as expected. But if you run horizon as command as you suggest in your tweet/doc etc horizon will fail.

1. Prove that horizon works within the container

docker-compose exec php bash
# Run horizon
php artisan horizon

you should see the following Q.E.D

2. Prove that the container failed

If you look into logs you are going to see that the horizon container shut down with a failure

docker-compose logs horizon

Among the lines you should see the connection error