# systemd-socket-activate > Socket activation for systemd services. > More information: . - Activate a service when a specific socket is connected: `systemd-socket-activate {{path/to/socket.service}}` - Activate multiple sockets for a service: `systemd-socket-activate {{path/to/socket1.service}} {{path/to/socket2.service}}` - Pass environment variables to the service being activated: `{{SYSTEMD_SOCKET_ACTIVATION=1}} systemd-socket-activate {{path/to/socket.service}}` - Activate a service along with a notification socket: `systemd-socket-activate {{path/to/socket.socket}} {{path/to/service.service}}` - Activate a service with a specified port: `systemd-socket-activate {{path/to/socket.service}} -l {{8080}}`