двунаправленное проксирование локальных сокетов на другой (возможно, удаленный) сокет (Bidirectionally proxy local sockets to another (possibly remote) socket)
Имя (Name)
systemd-socket-proxyd - Bidirectionally proxy local sockets to
another (possibly remote) socket
Синопсис (Synopsis)
systemd-socket-proxyd [OPTIONS...] HOST:PORT
systemd-socket-proxyd [OPTIONS...] UNIX-DOMAIN-SOCKET-PATH
Описание (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=no" and an event-driven design that
scales better with the number of connections.
Параметры (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-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".
Статус выхода (Exit)
On success, 0 is returned, a non-zero failure code otherwise.
Примеры (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=/usr/lib/systemd/systemd-socket-proxyd /run/nginx/socket
PrivateTmp=yes
PrivateNetwork=yes
Example 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 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=/usr/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/
Смотри также (See also)
systemd(1), systemd.socket(5), systemd.service(5), systemctl(1),
socat(1), nginx(1), curl(1)
