SYSTEMD−SOCKET−PROXYD - Online Linux Manual PageSection : 8
Updated :
Source : systemd 253
Note : systemd-socket-proxyd

NAMEsystemd-socket-proxyd − Bidirectionally proxy local sockets to another (possibly remote) socket

SYNOPSISsystemd−socket−proxyd [OPTIONS...] HOST:PORT systemd−socket−proxyd [OPTIONS...] UNIX−DOMAIN−SOCKET−PATH

DESCRIPTIONsystemd−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=no" and an event−driven design that scales better with the number of connections​.

OPTIONSThe 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−idle−time= Sets the time before exiting when there are no connections, defaults to infinity​. Takes a unit−less value in seconds, or a time span value such as "5min 20s"​.

EXIT STATUSOn success, 0 is returned, a non−zero failure code otherwise​.

EXAMPLES

Simple ExampleUse two services with a dependency and no namespace isolation​. Example ​1. ​proxy−to−nginx​.socket [Socket] ListenStream=80 [Install] WantedBy=sockets​.targetExample ​2. ​proxy−to−nginx​.service [Unit] Requires=nginx​.service After=nginx​.service Requires=proxy−to−nginx​.socket After=proxy−to−nginx​.socket [Service] ExecStart=/usr/lib/systemd/systemd−socket−proxyd /run/nginx/socket PrivateTmp=yes PrivateNetwork=yesExample ​3. ​nginx​.conf [​...] server { listen unix:/run/nginx/socket; [​...]Example ​4. ​Enabling the proxy # systemctl enable −−now proxy−to−nginx​.socket $ curl http://localhost:80/If nginx​.service has StopWhenUnneeded= set, then passing −−exit−idle−time= to systemd−socket−proxyd allows both services to stop during idle periods​.

Namespace ExampleSimilar 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​.targetExample ​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=/usr/lib/systemd/systemd−socket−proxyd 127​.0​.0​.1:8080 PrivateTmp=yes PrivateNetwork=yesExample ​7. ​nginx​.conf [​...] server { listen 8080; [​...]Example ​8. ​Enabling the proxy # systemctl enable −−now proxy−to−nginx​.socket $ curl http://localhost:80/

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