systemd-activate — Test socket activation of daemons
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.
-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
to systemd-activate will be passed through to
the dameon, in the original positions. Other sockets specified
--listen will use consecutive descriptors.
Prints a short help text and exits.
Prints a short version string and exits.
Listen on this
Takes a string like "
Launch a separate instance of daemon per connection and pass the connection socket as standard input and standard output.
Add this variable to the environment of the
launched process. If
followed by "
=", assume that it is a
variable–value pair. Otherwise, obtain the value from the
environment of systemd-activate itself.
$ /usr/lib/systemd/systemd-activate -l 2000 -a cat
This runs an echo server on port 2000.
$ /usr/lib/systemd/systemd-activate -l 19531 /usr/lib/systemd/systemd-journal-gatewayd
This runs a socket activated instance of systemd-journal-gatewayd(8).