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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.

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

           [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 proxy-to-nginx.socket
           # systemctl start 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
           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 proxy-to-nginx.socket
           # systemctl start 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 229                                                              SYSTEMD-SOCKET-PROXYD(8)

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