Edit: /etc/systemd/system/a2web.service (249B)
[Unit]
Description=a2web service
After=network.target
[Service]
Type=simple
User=$USER
WorkingDirectory=/root/a2web
Environment=NODE_ENV=production
ExecStart=/usr/bin/node server.js
Restart=always
RestartSec=5
[Install]
WantedBy=multi-user.target