Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_limit_req_module.xml @ 619:625b592698b6
Updated with Netcraft August 2012 Web Server Survey stats.
author | Vladimir Homutov <vl@nginx.com> |
---|---|
date | Mon, 06 Aug 2012 11:18:39 +0000 |
parents | 764fbac1b8b4 |
children | c711c50bdcf4 |
rev | line source |
---|---|
222
bfe3eff81d04
Removed redundant encoding specification.
Ruslan Ermilov <ru@nginx.com>
parents:
179
diff
changeset
|
1 <?xml version="1.0"?> |
179
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
2 |
580
be54c443235a
Added copyright markers to documentation sources.
Ruslan Ermilov <ru@nginx.com>
parents:
575
diff
changeset
|
3 <!-- |
be54c443235a
Added copyright markers to documentation sources.
Ruslan Ermilov <ru@nginx.com>
parents:
575
diff
changeset
|
4 Copyright (C) Igor Sysoev |
be54c443235a
Added copyright markers to documentation sources.
Ruslan Ermilov <ru@nginx.com>
parents:
575
diff
changeset
|
5 Copyright (C) Nginx, Inc. |
be54c443235a
Added copyright markers to documentation sources.
Ruslan Ermilov <ru@nginx.com>
parents:
575
diff
changeset
|
6 --> |
be54c443235a
Added copyright markers to documentation sources.
Ruslan Ermilov <ru@nginx.com>
parents:
575
diff
changeset
|
7 |
179
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
8 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd"> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
9 |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
10 <module name="Module ngx_http_limit_req_module" |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
11 link="/en/docs/http/ngx_http_limit_req_module.html" |
589 | 12 lang="en" |
13 rev="1"> | |
179
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
14 |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
15 <section id="summary"> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
16 |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
17 <para> |
271 | 18 The <literal>ngx_http_limit_req_module</literal> module (0.7.21) allows |
529
d477ae38c0bd
Clarified on what this module actually limits.
Ruslan Ermilov <ru@nginx.com>
parents:
509
diff
changeset
|
19 to limit the request processing rate per defined key, |
d477ae38c0bd
Clarified on what this module actually limits.
Ruslan Ermilov <ru@nginx.com>
parents:
509
diff
changeset
|
20 in particular, the processing rate of requests coming |
179
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
21 from a single IP address. |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
22 The limitation is done using the “leaky bucket” method. |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
23 </para> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
24 |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
25 </section> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
26 |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
27 |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
28 <section id="example" name="Example Configuration"> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
29 |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
30 <para> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
31 <example> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
32 http { |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
33 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s; |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
34 |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
35 ... |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
36 |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
37 server { |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
38 |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
39 ... |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
40 |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
41 location /search/ { |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
42 limit_req zone=one burst=5; |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
43 } |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
44 </example> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
45 </para> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
46 |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
47 </section> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
48 |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
49 |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
50 <section id="directives" name="Directives"> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
51 |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
52 <directive name="limit_req"> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
53 <syntax> |
271 | 54 <literal>zone</literal>=<value>name</value> |
55 [<literal>burst</literal>=<value>number</value>] | |
56 [<literal>nodelay</literal>]</syntax> | |
179
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
57 <default/> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
58 <context>http</context> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
59 <context>server</context> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
60 <context>location</context> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
61 |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
62 <para> |
575
ebcb351d9eb3
Consistently using the term "shared memory zone".
Ruslan Ermilov <ru@nginx.com>
parents:
529
diff
changeset
|
63 Sets a shared memory zone |
ebcb351d9eb3
Consistently using the term "shared memory zone".
Ruslan Ermilov <ru@nginx.com>
parents:
529
diff
changeset
|
64 and the maximum allowed burst of requests. |
179
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
65 If the rate of requests exceeds the rate configured for a zone, |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
66 request processing is delayed such as that they are processed |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
67 at a defined rate. |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
68 Excessive requests are delayed until their number exceeds the |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
69 defined number of bursts. |
529
d477ae38c0bd
Clarified on what this module actually limits.
Ruslan Ermilov <ru@nginx.com>
parents:
509
diff
changeset
|
70 When exceeded, the request is terminated with an error |
179
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
71 <http-status code="503" text="Service Temporarily Unavailable"/>. |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
72 By default, the number of bursts is equal to zero. |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
73 For example, the directives |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
74 <example> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
75 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s; |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
76 |
351
a4fa80755eab
Consistently strip initial offset in examples.
Ruslan Ermilov <ru@nginx.com>
parents:
288
diff
changeset
|
77 server { |
a4fa80755eab
Consistently strip initial offset in examples.
Ruslan Ermilov <ru@nginx.com>
parents:
288
diff
changeset
|
78 location /search/ { |
a4fa80755eab
Consistently strip initial offset in examples.
Ruslan Ermilov <ru@nginx.com>
parents:
288
diff
changeset
|
79 limit_req zone=one burst=5; |
a4fa80755eab
Consistently strip initial offset in examples.
Ruslan Ermilov <ru@nginx.com>
parents:
288
diff
changeset
|
80 } |
179
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
81 </example> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
82 allow not more than 1 request per second at an average, |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
83 with bursts not exceeding 5 requests. |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
84 </para> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
85 |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
86 <para> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
87 If delaying of excessive requests while requests are being limited is not |
271 | 88 desired, the parameter <literal>nodelay</literal> should be used: |
179
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
89 <example> |
351
a4fa80755eab
Consistently strip initial offset in examples.
Ruslan Ermilov <ru@nginx.com>
parents:
288
diff
changeset
|
90 limit_req zone=one burst=5 nodelay; |
179
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
91 </example> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
92 </para> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
93 |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
94 </directive> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
95 |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
96 |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
97 <directive name="limit_req_log_level"> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
98 <syntax> |
271 | 99 <literal>info</literal> | |
100 <literal>notice</literal> | | |
101 <literal>warn</literal> | | |
102 <literal>error</literal></syntax> | |
179
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
103 <default>error</default> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
104 <context>http</context> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
105 <context>server</context> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
106 <context>location</context> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
107 <appeared-in>0.8.18</appeared-in> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
108 |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
109 <para> |
529
d477ae38c0bd
Clarified on what this module actually limits.
Ruslan Ermilov <ru@nginx.com>
parents:
509
diff
changeset
|
110 Sets the desired logging level |
d477ae38c0bd
Clarified on what this module actually limits.
Ruslan Ermilov <ru@nginx.com>
parents:
509
diff
changeset
|
111 for cases when the server refuses to process requests |
d477ae38c0bd
Clarified on what this module actually limits.
Ruslan Ermilov <ru@nginx.com>
parents:
509
diff
changeset
|
112 due to rate being exceeded, |
d477ae38c0bd
Clarified on what this module actually limits.
Ruslan Ermilov <ru@nginx.com>
parents:
509
diff
changeset
|
113 or delays request processing. |
d477ae38c0bd
Clarified on what this module actually limits.
Ruslan Ermilov <ru@nginx.com>
parents:
509
diff
changeset
|
114 Delays are logged with the level one less than refusals; for example, |
271 | 115 if “<literal>limit_req_log_level notice</literal>” is specified, |
116 delays are logged with the <literal>info</literal> level. | |
179
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
117 </para> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
118 |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
119 </directive> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
120 |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
121 |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
122 <directive name="limit_req_zone"> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
123 <syntax> |
271 | 124 <value>$variable</value> |
125 <literal>zone</literal>=<value>name</value>:<value>size</value> | |
126 <literal>rate</literal>=<value>rate</value></syntax> | |
179
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
127 <default/> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
128 <context>http</context> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
129 |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
130 <para> |
575
ebcb351d9eb3
Consistently using the term "shared memory zone".
Ruslan Ermilov <ru@nginx.com>
parents:
529
diff
changeset
|
131 Sets parameters of a shared memory zone |
ebcb351d9eb3
Consistently using the term "shared memory zone".
Ruslan Ermilov <ru@nginx.com>
parents:
529
diff
changeset
|
132 that keeps states for various keys. |
529
d477ae38c0bd
Clarified on what this module actually limits.
Ruslan Ermilov <ru@nginx.com>
parents:
509
diff
changeset
|
133 The state stores the current number of excessive requests in particular. |
390
bef9e1a2e3c8
Documented the fact that empty values are not accounted in zones.
Ruslan Ermilov <ru@nginx.com>
parents:
351
diff
changeset
|
134 The key is any non-empty value of the specified variable |
509 | 135 (empty values are not accounted). |
288 | 136 Example usage: |
179
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
137 <example> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
138 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s; |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
139 </example> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
140 </para> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
141 |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
142 <para> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
143 Here, the states are kept in a 10 megabyte zone “one”, and an |
529
d477ae38c0bd
Clarified on what this module actually limits.
Ruslan Ermilov <ru@nginx.com>
parents:
509
diff
changeset
|
144 average request processing rate for this zone cannot exceed |
179
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
145 1 request per second. |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
146 </para> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
147 |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
148 <para> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
149 An IP address of the client serves as a key. |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
150 Note that instead of <var>$remote_addr</var>, the |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
151 <var>$binary_remote_addr</var> variable is used here, |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
152 allowing to lower the size of a state down to 64 bytes. |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
153 One megabyte zone can keep about 16 thousand 64-byte states. |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
154 If the storage for a zone is exhausted, the server will return error |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
155 <http-status code="503" text="Service Temporarily Unavailable"/> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
156 to all further requests. |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
157 </para> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
158 |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
159 <para> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
160 The rate is specified in requests per second (r/s). |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
161 If a rate of less than one request per second is desired, |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
162 it is specified in request per minute (r/m). |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
163 For example, half-request per second is 30r/m. |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
164 </para> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
165 |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
166 </directive> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
167 |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
168 </section> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
169 |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
170 </module> |