centos man page for systemd-activate

SYSTEMD-ACTIVATE(8)						 systemd-activate					       SYSTEMD-ACTIVATE(8)

NAME
       systemd-activate - Test socket activation of daemons

SYNOPSIS
       /usr/lib/systemd/systemd-activate [OPTIONS...] daemon [OPTIONS...]

DESCRIPTION
       systemd-activate can be used to launch a socket activated daemon from the command-line for testing purposes. It can also be used to launch
       single instances of the daemon per connection (inetd-style).

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

       If the -a option is given, file descriptor of the connection 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-activate will be passed through to the dameon, in the original positions. Other sockets specified with
       --listen will use consecutive descriptors.

OPTIONS
       --help, -h
	   Prints a short help text and exits.

       --version
	   Prints a short version string and exits.

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

       -a, --accept
	   Launch a separate instance of daemon per connection and pass the connection socket as standard input and standard output.

       -E VAR[=VALUE], --environment=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-activate itself.

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

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

EXAMPLE 1
	   $ /usr/lib/systemd/systemd-activate -l 2000 -a cat

       This runs an echo server on port 2000.

EXAMPLE 2
	   $ /usr/lib/systemd/systemd-activate -l 19531 /usr/lib/systemd/systemd-journal-gatewayd

       This runs a socket activated instance of systemd-journal-gatewayd(8).

SEE ALSO
       systemd(1), systemd.socket(5), systemd.service(5), cat(1)

systemd 208														       SYSTEMD-ACTIVATE(8)