Here's a systemd file that will restart a caddy server when the server restarts.
Place this file in /etc/systemd/system/caddy.service
on
an ubuntu server.
[Unit]
Description=Caddy
Documentation=https://caddyserver.com/docs/
After=network.target
[Service]
User=caddy
Group=caddy
ExecStart=/usr/bin/caddy run --environ --config /etc/caddy/Caddyfile
ExecReload=/usr/bin/caddy reload --config /etc/caddy/Caddyfile
TimeoutStopSec=5s
LimitNOFILE=1048576
LimitNPROC=512
PrivateTmp=true
ProtectSystem=full
AmbientCapabilities=CAP_NET_BIND_SERVICE
[Install]
WantedBy=multi-user.target