Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_memcached_module.xml @ 614:0526cac4637e
Removed intimate details of the "debug_connection" directive's
behavior that is soon to be changed again.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Tue, 31 Jul 2012 13:24:43 +0000 |
parents | 764fbac1b8b4 |
children | 08140f6b7964 |
rev | line source |
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363
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1 <?xml version="1.0"?> |
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2 |
580
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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 |
363
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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" |
13 rev="1"> | |
363
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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_http_memcached_module</literal> module allows 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. |
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21 A response should be put in memcached in advance via means that are |
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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_buffer_size"> |
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52 <syntax><value>size</value></syntax> |
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53 <default>4k|8k</default> |
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54 <context>http</context> |
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55 <context>server</context> |
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56 <context>location</context> |
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57 |
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58 <para> |
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59 Sets <value>size</value> of the buffer used for reading a response |
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60 received from the memcached server. |
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61 A response is passed to a client synchronously, immediately as it is received. |
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62 </para> |
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63 |
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64 </directive> |
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65 |
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66 |
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67 <directive name="memcached_connect_timeout"> |
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68 <syntax><value>time</value></syntax> |
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69 <default>60s</default> |
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70 <context>http</context> |
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71 <context>server</context> |
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72 <context>location</context> |
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73 |
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74 <para> |
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75 Defines a timeout for establishing a connection with the memcached server. |
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76 It should be noted that this timeout cannot usually exceed 75 seconds. |
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77 </para> |
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78 |
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79 </directive> |
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80 |
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81 |
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82 <directive name="memcached_next_upstream"> |
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83 <syntax> |
364 | 84 <literal>error</literal> | |
85 <literal>timeout</literal> | | |
86 <literal>invalid_response</literal> | | |
87 <literal>not_found</literal> | | |
88 <literal>off</literal> | |
89 ...</syntax> | |
363
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90 <default>error timeout</default> |
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91 <context>http</context> |
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92 <context>server</context> |
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93 <context>location</context> |
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94 |
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95 <para> |
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96 Specifies in which cases a request should be passed to the next server: |
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97 <list type="tag"> |
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98 |
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99 <tag-name><literal>error</literal></tag-name> |
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100 <tag-desc>an error occurred while establishing a connection with the |
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101 server, passing it a request, or reading the response header;</tag-desc> |
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102 |
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103 <tag-name><literal>timeout</literal></tag-name> |
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104 <tag-desc>a timeout has occurred while establishing a connection with the |
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105 server, passing it a request, or reading the response header;</tag-desc> |
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106 |
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107 <tag-name><literal>invalid_response</literal></tag-name> |
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108 <tag-desc>a server returned empty or invalid response;</tag-desc> |
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109 |
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110 <tag-name><literal>not_found</literal></tag-name> |
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111 <tag-desc>a response was not found on the server;</tag-desc> |
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112 |
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113 <tag-name><literal>off</literal></tag-name> |
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114 <tag-desc>disables passing a request to the next server.</tag-desc> |
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115 |
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116 </list> |
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117 </para> |
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118 |
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119 <para> |
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120 It should be understood that passing a request to the next server is |
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121 only possible if a client was not sent anything yet. |
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122 That is, if an error or a timeout occurs in the middle of |
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123 transferring a response, fixing this is impossible. |
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124 </para> |
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125 |
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126 </directive> |
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127 |
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128 |
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129 <directive name="memcached_pass"> |
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130 <syntax><value>address</value></syntax> |
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131 <default/> |
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132 <context>location</context> |
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133 <context>if in location</context> |
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134 |
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135 <para> |
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136 Sets an address of the memcached server. |
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137 An address can be specified as a domain name or an address, and a port, |
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138 for example, |
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139 <example> |
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140 memcached_pass localhost:11211; |
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141 </example> |
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142 </para> |
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143 |
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144 <para> |
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145 If a domain name resolves to several addresses, all of them will be |
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146 used in a round-robin fashion. |
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147 In addition, an address can be specified as a |
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148 <link doc="ngx_http_upstream_module.xml">server group</link>. |
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149 </para> |
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150 |
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151 </directive> |
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152 |
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153 |
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154 <directive name="memcached_read_timeout"> |
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155 <syntax><value>time</value></syntax> |
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156 <default>60s</default> |
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157 <context>http</context> |
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158 <context>server</context> |
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159 <context>location</context> |
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160 |
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161 <para> |
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162 Defines a timeout for reading a response from the memcached server. |
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163 A timeout is only set between two successive read operations, |
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164 not for the transmission of the whole response. |
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165 If a memcached server does not transmit anything within this time, |
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166 a connection is closed. |
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167 </para> |
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168 |
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169 </directive> |
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170 |
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171 |
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172 <directive name="memcached_send_timeout"> |
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173 <syntax><value>time</value></syntax> |
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174 <default>60s</default> |
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175 <context>http</context> |
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176 <context>server</context> |
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177 <context>location</context> |
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178 |
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179 <para> |
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180 Sets a timeout for transmitting a request to the memcached server. |
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181 A timeout is only set between two successive write operations, |
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182 not for the transmission of the whole request. |
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183 If a memcached server does not receive anything within this time, |
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184 a connection is closed. |
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185 </para> |
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186 |
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187 </directive> |
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188 |
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189 </section> |
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190 |
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191 </module> |