Mercurial > hg > nginx-site
annotate xml/en/docs/stream/ngx_stream_limit_conn_module.xml @ 2045:ae16f480c867
Fixed links in yaml script to accept folded block scalars (>).
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Wed, 06 Sep 2017 15:15:40 +0300 |
parents | ab56dcd73af2 |
children | 5d7fd7d9a2b6 |
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1 <?xml version="1.0"?> |
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2 |
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3 <!-- |
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4 Copyright (C) Igor Sysoev |
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5 Copyright (C) Nginx, Inc. |
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6 --> |
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7 |
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8 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd"> |
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9 |
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10 <module name="Module ngx_stream_limit_conn_module" |
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11 link="/en/docs/stream/ngx_stream_limit_conn_module.html" |
589 | 12 lang="en" |
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13 rev="3"> |
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14 |
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15 <section id="summary"> |
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16 |
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17 <para> |
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18 The <literal>ngx_stream_limit_conn_module</literal> module (1.9.3) is used to |
966 | 19 limit the number of connections per the defined key, in |
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20 particular, the number of connections from a single IP address. |
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21 </para> |
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22 |
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23 </section> |
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24 |
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25 |
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26 <section id="example" name="Example Configuration"> |
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27 |
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28 <para> |
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29 <example> |
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30 stream { |
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31 limit_conn_zone $binary_remote_addr zone=addr:10m; |
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32 |
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33 ... |
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34 |
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35 server { |
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36 |
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37 ... |
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38 |
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39 limit_conn addr 1; |
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40 limit_conn_log_level error; |
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41 } |
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42 } |
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43 </example> |
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44 </para> |
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45 |
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46 </section> |
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47 |
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48 |
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49 <section id="directives" name="Directives"> |
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50 |
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51 <directive name="limit_conn"> |
271 | 52 <syntax><value>zone</value> <value>number</value></syntax> |
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53 <default/> |
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54 <context>stream</context> |
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55 <context>server</context> |
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56 |
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57 <para> |
966 | 58 Sets the shared memory zone |
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59 and the maximum allowed number of connections for a given key value. |
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60 When this limit is exceeded, the server will close the connection. |
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61 For example, the directives |
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62 <example> |
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63 limit_conn_zone $binary_remote_addr zone=addr:10m; |
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64 |
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65 server { |
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66 ... |
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67 limit_conn addr 1; |
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68 } |
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69 </example> |
966 | 70 allow only one connection per an IP address at a time. |
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71 </para> |
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72 |
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73 <para> |
271 | 74 When several <literal>limit_conn</literal> directives are specified, |
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75 any configured limit will apply. |
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76 </para> |
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77 |
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78 <para> |
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79 The directives are inherited from the previous level if and |
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80 only if there are no |
271 | 81 <literal>limit_conn</literal> |
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82 directives on the current level. |
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83 </para> |
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84 |
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85 </directive> |
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86 |
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87 |
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88 <directive name="limit_conn_log_level"> |
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89 <syntax> |
271 | 90 <literal>info</literal> | |
91 <literal>notice</literal> | | |
92 <literal>warn</literal> | | |
93 <literal>error</literal></syntax> | |
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94 <default>error</default> |
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95 <context>stream</context> |
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96 <context>server</context> |
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97 |
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98 <para> |
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99 Sets the desired logging level for cases when the server |
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100 limits the number of connections. |
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101 </para> |
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102 |
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103 </directive> |
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104 |
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105 |
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106 <directive name="limit_conn_zone"> |
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107 <syntax> |
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108 <value>key</value> |
271 | 109 <literal>zone</literal>=<value>name</value>:<value>size</value></syntax> |
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110 <default/> |
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111 <context>stream</context> |
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112 |
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113 <para> |
966 | 114 Sets parameters for a shared memory zone |
115 that will keep states for various keys. | |
116 In particular, the state includes the current number of connections. | |
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117 The <value>key</value> can contain text, variables, |
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118 and their combinations (1.11.2). |
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119 Connections with an empty key value are not accounted. |
966 | 120 Usage example: |
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121 <example> |
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122 limit_conn_zone $binary_remote_addr zone=addr:10m; |
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123 </example> |
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124 Here, the key is a client IP address set by the |
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125 <literal>$binary_remote_addr</literal> variable. |
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126 The size of <literal>$binary_remote_addr</literal> |
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127 is 4 bytes for IPv4 addresses or 16 bytes for IPv6 addresses. |
6c96a644b0b3
Corrected description of $binary_remote_addr and saved state.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1517
diff
changeset
|
128 The stored state always occupies 32 or 64 bytes |
966 | 129 on 32-bit platforms and 64 bytes on 64-bit platforms. |
130 One megabyte zone can keep about 32 thousand 32-byte states | |
131 or about 16 thousand 64-byte states. | |
1517
53ae63cb4cfa
Added the limit_conn module for stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1347
diff
changeset
|
132 If the zone storage is exhausted, the server will close the connection. |
179
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
133 </para> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
134 |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
135 </directive> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
136 |
364 | 137 |
179
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
138 </section> |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
139 |
8cc01e2179a9
- Reflected recent changes made to ngx_http_limit_conn_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
140 </module> |