gentoo-overlay/net-dialup/freeradius/files/freeradius.service

[Unit]
Description=FreeRADIUS high performance RADIUS server.
After=syslog.target network.target

[Service]
Type=simple
PIDFile=/run/radiusd/radiusd.pid
ExecStartPre=-/bin/chown -R radius.radius /run/radiusd
ExecStartPre=/usr/sbin/radiusd -C
ExecStart=/usr/sbin/radiusd -d /etc/raddb -f
ExecReload=/usr/sbin/radiusd -C
ExecReload=/bin/kill -HUP $MAINPID

[Install]
WantedBy=multi-user.target