gentoo-overlay/net-vpn/headscale/files/headscale.service

[Unit]
Description=headscale controller
After=syslog.target
After=network.target

[Service]
Type=simple
User=headscale
Group=headscale
ExecStart=/usr/bin/headscale serve
Restart=always
RestartSec=5

# Optional security enhancements
NoNewPrivileges=yes
PrivateTmp=yes
ProtectSystem=strict
ProtectHome=yes
ReadWritePaths=/var/lib/headscale /run/headscale
AmbientCapabilities=CAP_NET_BIND_SERVICE
RuntimeDirectory=headscale

[Install]
WantedBy=multi-user.target