Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_memcached_module.xml @ 436:3a9f39341c7c
- Documented the "from" parameter of the "disable_symlinks" directive,
and that read permissions on intermediate directories are no longer
required on OSes that support opening directories for searching.
- Improved documentation of $document_root and $realpath_root.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Wed, 29 Feb 2012 13:25:22 +0000 |
parents | bb51d3e17dd0 |
children | be54c443235a |
rev | line source |
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1 <?xml version="1.0"?> |
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2 |
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3 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd"> |
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4 |
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5 <module name="Module ngx_http_memcached_module" |
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6 link="/en/docs/http/ngx_http_memcached_module.html" |
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7 lang="en"> |
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8 |
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9 <section id="summary"> |
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10 |
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11 <para> |
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12 The <literal>ngx_http_memcached_module</literal> module allows to obtain |
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13 responses from a memcached server. |
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14 The key is set in the <var>$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> |
364 | 78 <literal>error</literal> | |
79 <literal>timeout</literal> | | |
80 <literal>invalid_response</literal> | | |
81 <literal>not_found</literal> | | |
82 <literal>off</literal> | |
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> |