systemd unit file for running ruby/rails delayed_job as service

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# Keep delayed job workers running using systemd on ubuntu
# Usage
# Start "sudo systemctl start delayed_job@{0..3}" to start 4 worker instances
# Enable "sudo systemctl enable delayed_job@{0..3}" to enable 4 worker instances
# Restart "sudo systemctl restart delayed_job@{0..3}" to restart 4 worker instances
# Disable "sudo systemctl disable delayed_job@{0..3}" to disable 4 worker instances
# Stop "sudo systemctl stop delayed_job@{0..3}" to stop 4 worker instances

[Unit]
Description=Delayed Job Worker %i
After=syslog.target network.target
AssertPathExists=/var/www/app

[Service]
Type=simple
WorkingDirectory=/var/www/app

ExecStart=/bin/bash -lc 'RAILS_ENV=production script/delayed_job restart'
KillSignal=SIGINT
User=deploy
Group=deploy
UMask=0002

# Restart after 1 minute delay
Restart=on-failure
RestartSec=60

StandardOutput=syslog
StandardError=syslog
SyslogIdentifier=dj_worker_%i

[Install]
WantedBy=multi-user.target