Manual: systemd-socket-activate

SYSTEMD-SOCKET-ACTIVATE(1)			   systemd-socket-activate			  SYSTEMD-SOCKET-ACTIVATE(1)

NAME
       systemd-socket-activate - Test socket activation of daemons

SYNOPSIS

       systemd-socket-activate [OPTIONS...] COMMAND [ARGS...]

DESCRIPTION
       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 connection.

       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).

OPTIONS
       -l address, --listen=address
	   Listen on this address. Takes a string like "2000" or "127.0.0.1:2001".

	   Added in version 230.

       -a, --accept
	   Launch an instance of the service program for each connection and pass the connection socket. May not be combined
	   with --now.

	   Added in version 230.

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

	   Added in version 230.

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

	   Added in version 230.

       --inetd
	   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 above).

	   Added in version 230.

       -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.

	   Added in version 230.

       --fdname=NAME[:NAME...]
	   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.

	   Added in version 230.

       --now
	   Start the service program instantly, instead of waiting for a connection on the socket(s). May not be combined
	   with --accept.

	   Added in version 258.

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

       --version
	   Print a short version string and exit.

ENVIRONMENT VARIABLES
       $LISTEN_FDS, $LISTEN_PID, $LISTEN_PIDFDID, $LISTEN_FDNAMES
	   See sd_listen_fds(3).

	   Added in version 230.

       $SYSTEMD_LOG_TARGET, $SYSTEMD_LOG_LEVEL, $SYSTEMD_LOG_TIME, $SYSTEMD_LOG_COLOR, $SYSTEMD_LOG_LOCATION
	   Same as in systemd(1).

	   Added in version 230.

EXAMPLES
       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-gatewayd(8)

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

SEE ALSO
       systemd(1), systemd.socket(5), systemd.service(5), systemd-run(1), sd_listen_fds(3), sd_listen_fds_with_names(3),
       cat(1)

systemd 259.5											  SYSTEMD-SOCKET-ACTIVATE(1)