Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_memcached_module.xml @ 1928:2c14a16c61eb
Added modules section to development guide.
author | Vladimir Homutov <vl@nginx.com> |
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date | Fri, 10 Mar 2017 16:33:09 +0300 |
parents | 6839c258c473 |
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rev | line source |
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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_http_memcached_module" |
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11 link="/en/docs/http/ngx_http_memcached_module.html" |
589 | 12 lang="en" |
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13 rev="15"> |
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14 |
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15 <section id="summary"> |
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16 |
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17 <para> |
966 | 18 The <literal>ngx_http_memcached_module</literal> module is used to obtain |
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19 responses from a memcached server. |
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20 The key is set in the <var>$memcached_key</var> variable. |
966 | 21 A response should be put in memcached in advance by means |
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22 external to nginx. |
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23 </para> |
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24 |
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25 </section> |
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26 |
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27 |
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28 <section id="example" name="Example Configuration"> |
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29 |
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30 <para> |
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31 <example> |
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32 server { |
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33 location / { |
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34 set $memcached_key "$uri?$args"; |
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35 memcached_pass host:11211; |
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36 error_page 404 502 504 = @fallback; |
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37 } |
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38 |
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39 location @fallback { |
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40 proxy_pass http://backend; |
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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="memcached_bind"> |
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52 <syntax> |
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53 <value>address</value> |
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54 [ <literal>transparent </literal>] | |
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55 <literal>off</literal></syntax> |
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56 <default/> |
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57 <context>http</context> |
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58 <context>server</context> |
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59 <context>location</context> |
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60 <appeared-in>0.8.22</appeared-in> |
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61 |
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62 <para> |
966 | 63 Makes outgoing connections to a memcached server originate |
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64 from the specified local IP address with an optional port (1.11.2). |
966 | 65 Parameter value can contain variables (1.3.12). |
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66 The special value <literal>off</literal> (1.3.12) cancels the effect |
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67 of the <literal>memcached_bind</literal> directive |
966 | 68 inherited from the previous configuration level, which allows the |
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69 system to auto-assign the local IP address and port. |
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70 </para> |
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71 |
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72 <para id="memcached_bind_transparent"> |
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73 The <literal>transparent</literal> parameter (1.11.0) allows |
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74 outgoing connections to a memcached server originate |
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75 from a non-local IP address, |
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76 for example, from a real IP address of a client: |
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77 <example> |
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78 memcached_bind $remote_addr transparent; |
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79 </example> |
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80 In order for this parameter to work, |
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81 it is necessary to run nginx worker processes with the |
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82 <link doc="../ngx_core_module.xml" id="user">superuser</link> privileges |
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83 and configure kernel routing table |
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84 to intercept network traffic from the memcached server. |
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85 </para> |
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86 |
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87 </directive> |
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88 |
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89 |
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90 <directive name="memcached_buffer_size"> |
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91 <syntax><value>size</value></syntax> |
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92 <default>4k|8k</default> |
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93 <context>http</context> |
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94 <context>server</context> |
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95 <context>location</context> |
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96 |
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97 <para> |
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98 Sets the <value>size</value> of the buffer used for reading the response |
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99 received from the memcached server. |
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100 The response is passed to the client synchronously, as soon as it is received. |
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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="memcached_connect_timeout"> |
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107 <syntax><value>time</value></syntax> |
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108 <default>60s</default> |
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109 <context>http</context> |
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110 <context>server</context> |
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111 <context>location</context> |
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112 |
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113 <para> |
966 | 114 Defines a timeout for establishing a connection with a memcached server. |
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115 It should be noted that this timeout cannot usually exceed 75 seconds. |
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116 </para> |
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117 |
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118 </directive> |
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119 |
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120 |
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121 <directive name="memcached_force_ranges"> |
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122 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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123 <default>off</default> |
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124 <context>http</context> |
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125 <context>server</context> |
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126 <context>location</context> |
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127 <appeared-in>1.7.7</appeared-in> |
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128 |
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129 <para> |
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130 Enables byte-range support |
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131 for both cached and uncached responses from the memcached server |
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132 regardless of the <header>Accept-Ranges</header> field in these responses. |
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133 </para> |
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134 |
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135 </directive> |
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136 |
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137 |
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138 <directive name="memcached_gzip_flag"> |
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139 <syntax><value>flag</value></syntax> |
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140 <default></default> |
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141 <context>http</context> |
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142 <context>server</context> |
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143 <context>location</context> |
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144 <appeared-in>1.3.6</appeared-in> |
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145 |
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146 <para> |
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147 Enables the test for the <value>flag</value> presence in the memcached |
966 | 148 server response and sets the “<literal>Content-Encoding</literal>” |
149 response header field to “<literal>gzip</literal>” | |
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150 if the flag is set. |
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151 </para> |
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152 |
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153 </directive> |
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154 |
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155 |
363
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156 <directive name="memcached_next_upstream"> |
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157 <syntax> |
364 | 158 <literal>error</literal> | |
159 <literal>timeout</literal> | | |
160 <literal>invalid_response</literal> | | |
161 <literal>not_found</literal> | | |
162 <literal>off</literal> | |
163 ...</syntax> | |
363
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164 <default>error timeout</default> |
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165 <context>http</context> |
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166 <context>server</context> |
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167 <context>location</context> |
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168 |
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169 <para> |
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170 Specifies in which cases a request should be passed to the next server: |
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171 <list type="tag"> |
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172 |
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173 <tag-name><literal>error</literal></tag-name> |
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174 <tag-desc>an error occurred while establishing a connection with the |
966 | 175 server, passing a request to it, or reading the response header;</tag-desc> |
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176 |
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177 <tag-name><literal>timeout</literal></tag-name> |
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178 <tag-desc>a timeout has occurred while establishing a connection with the |
966 | 179 server, passing a request to it, or reading the response header;</tag-desc> |
363
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180 |
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181 <tag-name><literal>invalid_response</literal></tag-name> |
966 | 182 <tag-desc>a server returned an empty or invalid response;</tag-desc> |
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183 |
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184 <tag-name><literal>not_found</literal></tag-name> |
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185 <tag-desc>a response was not found on the server;</tag-desc> |
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186 |
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187 <tag-name><literal>off</literal></tag-name> |
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188 <tag-desc>disables passing a request to the next server.</tag-desc> |
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189 |
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190 </list> |
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191 </para> |
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192 |
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193 <para> |
966 | 194 One should bear in mind that passing a request to the next server is |
195 only possible if nothing has been sent to a client yet. | |
196 That is, if an error or timeout occurs in the middle of the | |
197 transferring of a response, fixing this is impossible. | |
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198 </para> |
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199 |
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200 <para> |
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201 The directive also defines what is considered an |
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202 <link doc="ngx_http_upstream_module.xml" id="max_fails">unsuccessful |
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203 attempt</link> of communication with a server. |
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204 The cases of <literal>error</literal>, <literal>timeout</literal> and |
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205 <literal>invalid_header</literal> are always considered unsuccessful attempts, |
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206 even if they are not specified in the directive. |
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207 The case of <literal>not_found</literal> |
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208 is never considered an unsuccessful attempt. |
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209 </para> |
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210 |
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211 <para> |
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212 Passing a request to the next server can be limited by |
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213 <link id="memcached_next_upstream_tries">the number of tries</link> |
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214 and by <link id="memcached_next_upstream_timeout">time</link>. |
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215 </para> |
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216 |
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217 </directive> |
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218 |
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219 |
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220 <directive name="memcached_next_upstream_timeout"> |
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221 <syntax><value>time</value></syntax> |
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222 <default>0</default> |
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223 <context>http</context> |
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224 <context>server</context> |
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225 <context>location</context> |
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226 <appeared-in>1.7.5</appeared-in> |
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227 |
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228 <para> |
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229 Limits the time during which a request can be passed to the |
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230 <link id="memcached_next_upstream">next server</link>. |
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231 The <literal>0</literal> value turns off this limitation. |
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232 </para> |
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233 |
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234 </directive> |
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235 |
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236 |
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237 <directive name="memcached_next_upstream_tries"> |
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238 <syntax><value>number</value></syntax> |
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239 <default>0</default> |
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240 <context>http</context> |
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241 <context>server</context> |
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242 <context>location</context> |
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243 <appeared-in>1.7.5</appeared-in> |
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244 |
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245 <para> |
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246 Limits the number of possible tries for passing a request to the |
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247 <link id="memcached_next_upstream">next server</link>. |
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248 The <literal>0</literal> value turns off this limitation. |
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249 </para> |
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250 |
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251 </directive> |
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252 |
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253 |
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254 <directive name="memcached_pass"> |
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255 <syntax><value>address</value></syntax> |
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256 <default/> |
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257 <context>location</context> |
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258 <context>if in location</context> |
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259 |
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260 <para> |
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262 The address can be specified as a domain name or IP address, |
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263 and a port: |
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264 <example> |
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265 memcached_pass localhost:11211; |
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266 </example> |
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267 or as a UNIX-domain socket path: |
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268 <example> |
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269 memcached_pass unix:/tmp/memcached.socket; |
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270 </example> |
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271 </para> |
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272 |
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273 <para> |
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274 If a domain name resolves to several addresses, all of them will be |
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275 used in a round-robin fashion. |
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276 In addition, an address can be specified as a |
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277 <link doc="ngx_http_upstream_module.xml">server group</link>. |
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278 </para> |
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279 |
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280 </directive> |
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281 |
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282 |
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283 <directive name="memcached_read_timeout"> |
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284 <syntax><value>time</value></syntax> |
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285 <default>60s</default> |
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286 <context>http</context> |
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287 <context>server</context> |
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288 <context>location</context> |
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289 |
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290 <para> |
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291 Defines a timeout for reading a response from the memcached server. |
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292 The timeout is set only between two successive read operations, |
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293 not for the transmission of the whole response. |
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294 If the memcached server does not transmit anything within this time, |
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296 </para> |
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297 |
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298 </directive> |
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299 |
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300 |
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301 <directive name="memcached_send_timeout"> |
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302 <syntax><value>time</value></syntax> |
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303 <default>60s</default> |
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304 <context>http</context> |
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305 <context>server</context> |
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306 <context>location</context> |
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307 |
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308 <para> |
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309 Sets a timeout for transmitting a request to the memcached server. |
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310 The timeout is set only between two successive write operations, |
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311 not for the transmission of the whole request. |
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312 If the memcached server does not receive anything within this time, |
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313 the connection is closed. |
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314 </para> |
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315 |
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316 </directive> |
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317 |
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318 </section> |
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319 |
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320 |
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321 <section id="variables" name="Embedded Variables"> |
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322 |
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323 <para> |
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324 <list type="tag"> |
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325 |
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326 <tag-name id="var_memcached_key"><var>$memcached_key</var></tag-name> |
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327 <tag-desc> |
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328 Defines a key for obtaining response from a memcached server. |
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329 </tag-desc> |
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330 |
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331 </list> |
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332 </para> |
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333 |
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334 </section> |
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335 |
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336 </module> |