<?xml version="1.0"?>

<!--
  Copyright (C) Nginx, Inc.
  -->

<!DOCTYPE module SYSTEM "../../../../dtd/module.dtd">

<module name="Module ngx_stream_proxy_module"
        link="/en/docs/stream/ngx_stream_proxy_module.html"
        lang="en"
        rev="3">

<section id="summary">

<para>
The <literal>ngx_stream_proxy_module</literal> module (1.7.7) allows passing
connections to another server over TCP and UNIX-domain sockets.
</para>

<para>
<note>
This module is available as part of our
<commercial_version>commercial subscription</commercial_version>.
</note>
</para>

</section>


<section id="example" name="Example Configuration">

<para>
<example>
server {
    listen 127.0.0.1:12345;
    proxy_pass 127.0.0.1:8080;
}

server {
    listen 12345;
    proxy_connect_timeout 1s;
    proxy_timeout 3s;
    proxy_pass example.com:12345;
}

server {
    listen [::1]:12345;
    proxy_pass unix:/tmp/stream.socket;
}
</example>
</para>

</section>


<section id="directives" name="Directives">

<directive name="proxy_connect_timeout">
<syntax><value>time</value></syntax>
<default>60s</default>
<context>stream</context>
<context>server</context>

<para>
Defines a timeout for establishing a connection with a proxied server.
</para>

</directive>


<directive name="proxy_downstream_buffer">
<syntax><value>size</value></syntax>
<default>16k</default>
<context>stream</context>
<context>server</context>

<para>
Sets the <value>size</value> of the
buffer used for reading data from the client.
</para>

</directive>


<directive name="proxy_next_upstream">
<syntax><literal>on</literal> | <literal>off</literal></syntax>
<default>on</default>
<context>stream</context>
<context>server</context>
<appeared-in>1.7.10</appeared-in>

<para>
When a connection to the proxied server cannot be established, determines
whether a client connection will be passed to the next server.
</para>

<para>
Passing a connection to the next server can be limited by
<link id="proxy_next_upstream_tries">the number of tries</link>
and by <link id="proxy_next_upstream_timeout">time</link>.
</para>

</directive>


<directive name="proxy_next_upstream_timeout">
<syntax><value>time</value></syntax>
<default>0</default>
<context>stream</context>
<context>server</context>
<appeared-in>1.7.10</appeared-in>

<para>
Limits the time allowed to pass a connection to the
<link id="proxy_next_upstream">next server</link>.
The <literal>0</literal> value turns off this limitation.
</para>

</directive>


<directive name="proxy_next_upstream_tries">
<syntax><value>number</value></syntax>
<default>0</default>
<context>stream</context>
<context>server</context>
<appeared-in>1.7.10</appeared-in>

<para>
Limits the number of possible tries for passing a connection to the
<link id="proxy_next_upstream">next server</link>.
The <literal>0</literal> value turns off this limitation.
</para>

</directive>


<directive name="proxy_pass">
<syntax><value>address</value></syntax>
<default/>
<context>server</context>

<para>
Sets the address of a proxied server.
The address can be specified as a domain name or IP address,
and an obligatory port:
<example>
proxy_pass localhost:12345;
</example>
or as a UNIX-domain socket path:
<example>
proxy_pass unix:/tmp/stream.socket;
</example>
</para>

<para>
If a domain name resolves to several addresses, all of them will be
used in a round-robin fashion.
In addition, an address can be specified as a
<link doc="ngx_stream_upstream_module.xml">server group</link>.
</para>

</directive>


<directive name="proxy_ssl">
<syntax><literal>on</literal> | <literal>off</literal></syntax>
<default>off</default>
<context>stream</context>
<context>server</context>
<appeared-in>1.7.10</appeared-in>

<para>
Enables the SSL/TLS protocol for connections to a proxied server.
</para>

</directive>


<directive name="proxy_ssl_certificate">
<syntax><value>file</value></syntax>
<default/>
<context>stream</context>
<context>server</context>
<appeared-in>1.7.10</appeared-in>

<para>
Specifies a <value>file</value> with the certificate in the PEM format
used for authentication to a proxied server.
</para>

</directive>


<directive name="proxy_ssl_certificate_key">
<syntax><value>file</value></syntax>
<default/>
<context>stream</context>
<context>server</context>
<appeared-in>1.7.10</appeared-in>

<para>
Specifies a <value>file</value> with the secret key in the PEM format
used for authentication to a proxied server.
</para>

</directive>


<directive name="proxy_ssl_ciphers">
<syntax><value>ciphers</value></syntax>
<default>DEFAULT</default>
<context>stream</context>
<context>server</context>
<appeared-in>1.7.10</appeared-in>

<para>
Specifies the enabled ciphers for connections to a proxied server.
The ciphers are specified in the format understood by the OpenSSL library.
</para>

<para>
The full list can be viewed using the
“<command>openssl ciphers</command>” command.
</para>

</directive>


<directive name="proxy_ssl_crl">
<syntax><value>file</value></syntax>
<default/>
<context>stream</context>
<context>server</context>
<appeared-in>1.7.10</appeared-in>

<para>
Specifies a <value>file</value> with revoked certificates (CRL)
in the PEM format used to <link id="proxy_ssl_verify">verify</link>
the certificate of the proxied server.
</para>

</directive>


<directive name="proxy_ssl_name">
<syntax><value>name</value></syntax>
<default>host from proxy_pass</default>
<context>stream</context>
<context>server</context>
<appeared-in>1.7.10</appeared-in>

<para>
Allows to override the server name used to
<link id="proxy_ssl_verify">verify</link>
the certificate of the proxied server and to be
<link id="proxy_ssl_server_name">passed through SNI</link>
when establishing a connection with the proxied server.
</para>

<para>
By default, the host part of the <link id="proxy_pass"/> address is used.
</para>

</directive>


<directive name="proxy_ssl_password_file">
<syntax><value>file</value></syntax>
<default/>
<context>stream</context>
<context>server</context>
<appeared-in>1.7.10</appeared-in>

<para>
Specifies a <value>file</value> with passphrases for
<link id="proxy_ssl_certificate_key">secret keys</link>
where each passphrase is specified on a separate line.
Passphrases are tried in turn when loading the key.
</para>

</directive>


<directive name="proxy_ssl_server_name">
<syntax><literal>on</literal> | <literal>off</literal></syntax>
<default>off</default>
<context>stream</context>
<context>server</context>
<appeared-in>1.7.10</appeared-in>

<para>
Enables or disables passing of the server name through
<link url="http://en.wikipedia.org/wiki/Server_Name_Indication">TLS
Server Name Indication extension</link> (SNI, RFC 6066)
when establishing a connection with the proxied server.
</para>

</directive>


<directive name="proxy_ssl_session_reuse">
<syntax><literal>on</literal> | <literal>off</literal></syntax>
<default>on</default>
<context>stream</context>
<context>server</context>
<appeared-in>1.7.10</appeared-in>

<para>
Determines whether SSL sessions can be reused when working with
the proxied server.
If the errors
“<literal>SSL3_GET_FINISHED:digest check failed</literal>”
appear in the logs, try disabling session reuse.
</para>

</directive>


<directive name="proxy_ssl_protocols">
<syntax>
    [<literal>SSLv2</literal>]
    [<literal>SSLv3</literal>]
    [<literal>TLSv1</literal>]
    [<literal>TLSv1.1</literal>]
    [<literal>TLSv1.2</literal>]</syntax>
<default>SSLv3 TLSv1 TLSv1.1 TLSv1.2</default>
<context>stream</context>
<context>server</context>
<appeared-in>1.7.10</appeared-in>

<para>
Enables the specified protocols for connections to a proxied server.
</para>

</directive>


<directive name="proxy_ssl_trusted_certificate">
<syntax><value>file</value></syntax>
<default/>
<context>stream</context>
<context>server</context>
<appeared-in>1.7.10</appeared-in>

<para>
Specifies a <value>file</value> with trusted CA certificates in the PEM format
used to <link id="proxy_ssl_verify">verify</link>
the certificate of the proxied server.
</para>

</directive>


<directive name="proxy_ssl_verify">
<syntax><literal>on</literal> | <literal>off</literal></syntax>
<default>off</default>
<context>stream</context>
<context>server</context>
<appeared-in>1.7.10</appeared-in>

<para>
Enables or disables verification of the proxied server certificate.
</para>

</directive>


<directive name="proxy_ssl_verify_depth">
<syntax><value>number</value></syntax>
<default>1</default>
<context>stream</context>
<context>server</context>
<appeared-in>1.7.10</appeared-in>

<para>
Sets the verification depth in the proxied server certificates chain.
</para>

</directive>


<directive name="proxy_timeout">
<syntax><value>timeout</value></syntax>
<default>10m</default>
<context>stream</context>
<context>server</context>

<para>
Defines a timeout used after the proxying to the backend had started.
</para>

</directive>


<directive name="proxy_upstream_buffer">
<syntax><value>size</value></syntax>
<default>16k</default>
<context>stream</context>
<context>server</context>

<para>
Sets the <value>size</value> of the
buffer used for reading data from the upstream server.
</para>

</directive>

</section>

</module>