[Unit] 
Description=Promtail service 
After=network.target 
 
[Service] 
Type=simple 
User=root 
ExecStart=/usr/local/bin/promtail -config.file /etc/promtail/config.yml --client.external-labels=hostname=%H
Restart=on-failure 
RestartSec=20 
 
[Install] 
WantedBy=multi-user.target