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 specified 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
daemon, in the original positions. Other sockets specified with
--listen will use consecutive descriptors.
-l address, --listen=address
Listen on this address. Takes a string like "2000" or
Launch a separate instance of daemon per connection and pass the
connection socket as standard input and standard output.
-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
Specify a name for the activation file descriptors. This is
equivalent to setting FileDescriptorName= in socket unit files,
and enables use of sd_listen_fds_with_names(3).
Print a short help text and exit.
Print a short version string and exit.
Example 1. Run an echo server on port 2000
$ /usr/lib/systemd/systemd-activate -l 2000 -a cat
Example 2. Run a socket-activated instance of systemd-journal-gatewayd(8)
$ /usr/lib/systemd/systemd-activate -l 19531 /usr/lib/systemd/systemd-journal-gatewayd
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report for this manual page, see
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systemd 228 SYSTEMD-ACTIVATE(8)