systemd-socket-activate - Test socket activation of daemons

       systemd-socket-activate [OPTIONS...] daemon [OPTIONS...]

       systemd-socket-activate may be used to launch a socket-activated
       service program from the command line for testing purposes. It may also
       be used to launch individual instances of the service program per

       The daemon to launch and its options should be specified after options
       intended for systemd-socket-activate.

       If the --inetd option is given, the socket file descriptor will be used
       as the standard input and output of the launched process. Otherwise,
       standard input and output will be inherited, and sockets will be passed
       through file descriptors 3 and higher. Sockets passed through
       $LISTEN_FDS to systemd-socket-activate will be passed through to the
       daemon, in the original positions. Other sockets specified with
       --listen= will use consecutive descriptors. By default,
       systemd-socket-activate listens on a stream socket, use --datagram and
       --seqpacket to listen on datagram or sequential packet sockets instead
       (see below).

       -l address, --listen=address
           Listen on this address. Takes a string like "2000" or

       -a, --accept
           Launch an instance of the service program for each connection and
           pass the connection socket.

       -d, --datagram
           Listen on a datagram socket (SOCK_DGRAM), instead of a stream
           socket (SOCK_STREAM). May not be combined with --seqpacket.

           Listen on a sequential packet socket (SOCK_SEQPACKET), instead of a
           stream socket (SOCK_STREAM). May not be combined with --datagram.

           Use the inetd protocol for passing file descriptors, i.e. as
           standard input and standard output, instead of the new-style
           protocol for passing file descriptors using $LISTEN_FDS (see

       -E VAR[=VALUE], --setenv=VAR[=VALUE]
           Add this variable to the environment of the launched process. If
           VAR is followed by "=", assume that it is a variable-value pair.
           Otherwise, obtain the value from the environment of
           systemd-socket-activate itself.

           Specify names for the file descriptors passed. This is equivalent
           to setting FileDescriptorName= in socket unit files, and enables
           use of sd_listen_fds_with_names(3). Multiple entries may be
           specifies using separate options or by separating names with colons
           (":") in one option. In case more names are given than descriptors,
           superfluous ones will be ignored. In case less names are given than
           descriptors, the remaining file descriptors will be unnamed.

       -h, --help
           Print a short help text and exit.

           Print a short version string and exit.

           See sd_listen_fds(3).

           Same as in systemd(1).

       Example 1. Run an echo server on port 2000

           $ systemd-socket-activate -l 2000 --inetd -a cat

       Example 2. Run a socket-activated instance of systemd-journal-

           $ systemd-socket-activate -l 19531 /lib/systemd/systemd-journal-gatewayd

       systemd(1), systemd.socket(5), systemd.service(5), sd_listen_fds(3),
       sd_listen_fds_with_names(3), cat(1)

systemd 237                                         SYSTEMD-SOCKET-ACTIVATE(1)
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