[Unit]
Description=smart dns server
After=network.target 

[Service]
PIDFile=/var/run/smartdns.pid
EnvironmentFile=/etc/default/smartdns
ExecStart=/usr/sbin/smartdns $SMART_DNS_OPTS
KillMode=process
Restart=always
RestartSec=0

[Install]
WantedBy=multi-user.target
Alias=smartdns.service