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annotate xml/en/docs/http/ngx_http_memcached_module.xml @ 363:c7fccbe03827

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English translation of ngx_http_memcached_module.
author Ruslan Ermilov <ru@nginx.com>
date Thu, 26 Jan 2012 22:12:55 +0000
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children bb51d3e17dd0
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c7fccbe03827 English translation of ngx_http_memcached_module.
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1 <?xml version="1.0"?>
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2
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3 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd">
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4
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5 <module name="Module ngx_http_memcached_module"
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6 link="/en/docs/http/ngx_http_memcached_module.html"
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7 lang="en">
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8
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9 <section id="summary">
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10
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11 <para>
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12 The <literal>ngx_http_memcached_module</literal> module allows to obtain
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13 responses from a memcached server.
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14 The key is set in the <var>$memcached_key</var> variable.
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15 A response should be put in memcached in advance via means that are
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16 external to nginx.
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17 </para>
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18
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19 </section>
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20
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21
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22 <section id="example" name="Example Configuration">
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23
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24 <para>
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25 <example>
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26 server {
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27 location / {
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28 set $memcached_key "$uri?$args";
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29 memcached_pass host:11211;
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30 error_page 404 502 504 = @fallback;
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31 }
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32
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33 location @fallback {
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34 proxy_pass http://backend;
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35 }
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36 }
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37 </example>
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38 </para>
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39
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40 </section>
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41
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42
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43 <section id="directives" name="Directives">
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44
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45 <directive name="memcached_buffer_size">
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46 <syntax><value>size</value></syntax>
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47 <default>4k|8k</default>
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48 <context>http</context>
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49 <context>server</context>
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50 <context>location</context>
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51
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52 <para>
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53 Sets <value>size</value> of the buffer used for reading a response
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54 received from the memcached server.
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55 A response is passed to a client synchronously, immediately as it is received.
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56 </para>
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57
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58 </directive>
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59
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60
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61 <directive name="memcached_connect_timeout">
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62 <syntax><value>time</value></syntax>
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63 <default>60s</default>
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64 <context>http</context>
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65 <context>server</context>
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66 <context>location</context>
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67
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68 <para>
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69 Defines a timeout for establishing a connection with the memcached server.
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70 It should be noted that this timeout cannot usually exceed 75 seconds.
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71 </para>
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72
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73 </directive>
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74
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75
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76 <directive name="memcached_next_upstream">
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77 <syntax>
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78 <literal>error</literal> |
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79 <literal>timeout</literal> |
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80 <literal>invalid_response</literal> |
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81 <literal>not_found</literal> |
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82 <literal>off</literal>
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83 ...</syntax>
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84 <default>error timeout</default>
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85 <context>http</context>
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86 <context>server</context>
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87 <context>location</context>
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88
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89 <para>
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90 Specifies in which cases a request should be passed to the next server:
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91 <list type="tag">
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92
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93 <tag-name><literal>error</literal></tag-name>
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94 <tag-desc>an error occurred while establishing a connection with the
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95 server, passing it a request, or reading the response header;</tag-desc>
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96
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97 <tag-name><literal>timeout</literal></tag-name>
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98 <tag-desc>a timeout has occurred while establishing a connection with the
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99 server, passing it a request, or reading the response header;</tag-desc>
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100
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101 <tag-name><literal>invalid_response</literal></tag-name>
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102 <tag-desc>a server returned empty or invalid response;</tag-desc>
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103
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104 <tag-name><literal>not_found</literal></tag-name>
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105 <tag-desc>a response was not found on the server;</tag-desc>
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106
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107 <tag-name><literal>off</literal></tag-name>
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108 <tag-desc>disables passing a request to the next server.</tag-desc>
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109
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110 </list>
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111 </para>
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112
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113 <para>
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114 It should be understood that passing a request to the next server is
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115 only possible if a client was not sent anything yet.
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116 That is, if an error or a timeout occurs in the middle of
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117 transferring a response, fixing this is impossible.
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118 </para>
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119
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120 </directive>
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121
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122
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123 <directive name="memcached_pass">
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124 <syntax><value>address</value></syntax>
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125 <default/>
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126 <context>location</context>
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127 <context>if in location</context>
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128
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129 <para>
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130 Sets an address of the memcached server.
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131 An address can be specified as a domain name or an address, and a port,
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132 for example,
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133 <example>
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134 memcached_pass localhost:11211;
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135 </example>
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136 </para>
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137
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138 <para>
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139 If a domain name resolves to several addresses, all of them will be
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140 used in a round-robin fashion.
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141 In addition, an address can be specified as a
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142 <link doc="ngx_http_upstream_module.xml">server group</link>.
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143 </para>
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144
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145 </directive>
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146
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147
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148 <directive name="memcached_read_timeout">
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149 <syntax><value>time</value></syntax>
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150 <default>60s</default>
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151 <context>http</context>
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152 <context>server</context>
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153 <context>location</context>
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154
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155 <para>
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156 Defines a timeout for reading a response from the memcached server.
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157 A timeout is only set between two successive read operations,
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158 not for the transmission of the whole response.
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159 If a memcached server does not transmit anything within this time,
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160 a connection is closed.
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161 </para>
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162
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163 </directive>
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164
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165
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166 <directive name="memcached_send_timeout">
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167 <syntax><value>time</value></syntax>
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168 <default>60s</default>
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169 <context>http</context>
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170 <context>server</context>
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171 <context>location</context>
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172
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173 <para>
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174 Sets a timeout for transmitting a request to the memcached server.
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175 A timeout is only set between two successive write operations,
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176 not for the transmission of the whole request.
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177 If a memcached server does not receive anything within this time,
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178 a connection is closed.
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179 </para>
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180
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181 </directive>
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182
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183 </section>
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184
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185 </module>