systemd service:

```

[Unit] Description=Caddy HTTP/2 web server Documentation=https://caddyserver.com/docs After=network-online.target Wants=network-online.target systemd-networkd-wait-online.service

[Service] Restart=on-abnormal

; User and group the process will run as. User=root Group=root

; Letsencrypt-issued certificates will be written to this directory. Environment=CADDYPATH=/etc/ssl/caddy

; Always set “-root” to something safe in case it gets forgotten in the Caddyfile. ExecStart=/usr/local/bin/caddy -log stdout -agree=true -conf=/etc/caddy/Caddyfile -root=/var/tmp ExecReload=/bin/kill -USR1 $MAINPID

; Use graceful shutdown with a reasonable timeout KillMode=mixed KillSignal=SIGQUIT TimeoutStopSec=5s

; Limit the number of file descriptors; see `man systemd.exec` for more limit settings. LimitNOFILE=1048576 ; Unmodified caddy is not expected to use more than that. LimitNPROC=512

; Use private /tmp and /var/tmp, which are discarded after caddy stops. #PrivateTmp=true ; Use a minimal /dev #PrivateDevices=true ; Hide /home, /root, and /run/user. Nobody will steal your SSH-keys. #ProtectHome=true ; Make /usr, /boot, /etc and possibly some more folders read-only. ProtectSystem=full ; except /etc/ssl/caddy, because we want Letsencrypt-certificates there. ; This merely retains r/w access rights, it does not add any new. Must still be writable on the host! ReadWriteDirectories=/etc/ssl/caddy

; The following additional security directives only work with systemd v229 or later. ; They further restrict privileges that can be gained by caddy. Uncomment if you like. ; Note that you may have to add capabilities required by any plugins in use. ;CapabilityBoundingSet=CAP_NET_BIND_SERVICE ;AmbientCapabilities=CAP_NET_BIND_SERVICE ;NoNewPrivileges=true

[Install] WantedBy=multi-user.target

```