/usr/lib/systemd/system/caddy.service

[Unit]
Description=Caddy 1.0 by enoch
After=network-online.target

[Service]
TimeoutStopSec=5s
LimitNOFILE=1048576
LimitNPROC=512
Type=simple
PIDFile=/run/caddy.pid
ExecStart=/root/caddy -conf=/root/caddyfile -quic -agree=true -email=ywnsya@126.com -http2 -pidfile=/run/caddy.pid
ExecReload=/bin/kill -10 $MAINPID

[Install]
WantedBy=multi-user.target