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systemd-socket-proxyd

SYSTEMD-SOCKET-PROXYD(8)				       systemd-socket-proxyd					  SYSTEMD-SOCKET-PROXYD(8)

NAME

       systemd-socket-proxyd - Bidirectionally proxy local sockets to another (possibly remote) socket.

SYNOPSIS

       systemd-socket-proxyd [OPTIONS...] HOST:PORT

       systemd-socket-proxyd [OPTIONS...] UNIX-DOMAIN-SOCKET-PATH

DESCRIPTION

       systemd-socket-proxyd is a generic socket-activated network socket forwarder proxy daemon for IPv4, IPv6 and UNIX stream sockets. It may be
       used to bi-directionally forward traffic from a local listening socket to a local or remote destination socket.

       One use of this tool is to provide socket activation support for services that do not natively support socket activation. On behalf of the
       service to activate, the proxy inherits the socket from systemd, accepts each client connection, opens a connection to a configured server
       for each client, and then bidirectionally forwards data between the two.

       This utility's behavior is similar to socat(1). The main differences for systemd-socket-proxyd are support for socket activation with
       "Accept=false" and an event-driven design that scales better with the number of connections.

OPTIONS

       The following options are understood:

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

       --version
	   Print a short version string and exit.

       --connections-max=, -c
	   Sets the maximum number of simultaneous connections, defaults to 256. If the limit of concurrent connections is reached further
	   connections will be refused.

EXIT STATUS

       On success, 0 is returned, a non-zero failure code otherwise.

EXAMPLES

   Simple Example
       Use two services with a dependency and no namespace isolation.

       Example 1. proxy-to-nginx.socket

	   [Socket]
	   ListenStream=80

	   [Install]
	   WantedBy=sockets.target

       Example 2. proxy-to-nginx.service

	   [Unit]
	   Requires=nginx.service
	   After=nginx.service
	   Requires=proxy-to-nginx.socket
	   After=proxy-to-nginx.socket

	   [Service]
	   ExecStart=/lib/systemd/systemd-socket-proxyd /tmp/nginx.sock
	   PrivateTmp=yes
	   PrivateNetwork=yes

       Example 3. nginx.conf

	   [...]
	   server {
	       listen	    unix:/tmp/nginx.sock;
	       [...]

       Example 4. Enabling the proxy

	   # systemctl enable --now proxy-to-nginx.socket
	   $ curl http://localhost:80/

   Namespace Example
       Similar as above, but runs the socket proxy and the main service in the same private namespace, assuming that nginx.service has PrivateTmp=
       and PrivateNetwork= set, too.

       Example 5. proxy-to-nginx.socket

	   [Socket]
	   ListenStream=80

	   [Install]
	   WantedBy=sockets.target

       Example 6. proxy-to-nginx.service

	   [Unit]
	   Requires=nginx.service
	   After=nginx.service
	   Requires=proxy-to-nginx.socket
	   After=proxy-to-nginx.socket
	   JoinsNamespaceOf=nginx.service

	   [Service]
	   ExecStart=/lib/systemd/systemd-socket-proxyd 127.0.0.1:8080
	   PrivateTmp=yes
	   PrivateNetwork=yes

       Example 7. nginx.conf

	   [...]
	   server {
	       listen	    8080;
	       [...]

       Example 8. Enabling the proxy

	   # systemctl enable --now proxy-to-nginx.socket
	   $ curl http://localhost:80/

SEE ALSO

       systemd(1), systemd.socket(5), systemd.service(5), systemctl(1), socat(1), nginx(1), curl(1)

systemd 237														  SYSTEMD-SOCKET-PROXYD(8)

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