Mercurial > hg > nginx-site
annotate xml/en/docs/ngx_core_module.xml @ 535:f8652d663b62
Revised description of "proxy_pass".
author | Ruslan Ermilov <ru@nginx.com> |
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date | Thu, 14 Jun 2012 13:08:13 +0000 |
parents | a8daad8e83bb |
children | e97b46d1842d |
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="Core functionality" |
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6 link="/en/docs/ngx_core_module.html" |
98 | 7 lang="en"> |
63
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8 |
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9 <section id="example" name="Example Configuration"> |
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10 |
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11 <para> |
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12 <example> |
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13 user www www; |
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14 worker_processes 2; |
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15 |
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16 error_log /var/log/nginx-error.log info; |
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17 |
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18 events { |
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19 use kqueue; |
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20 worker_connections 2048; |
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21 } |
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22 |
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23 ... |
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24 </example> |
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25 </para> |
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26 |
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27 </section> |
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28 |
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29 |
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30 <section id="directives" name="Directives"> |
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31 |
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32 <directive name="daemon"> |
271 | 33 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
102
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34 <default>on</default> |
63
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35 <context>main</context> |
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36 |
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37 <para> |
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38 Determines whether nginx should become a daemon. |
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39 Mainly used during development. |
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40 </para> |
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41 |
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42 </directive> |
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43 |
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44 |
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45 <directive name="debug_connection"> |
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46 <syntax> |
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47 <value>address</value> | |
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48 <value>CIDR</value> | |
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49 <literal>unix:</literal></syntax> |
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50 <default/> |
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51 <context>events</context> |
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52 |
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53 <para> |
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54 Enables debugging log for selected client connections. |
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55 Other connections will use logging level set by the |
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56 <link id="error_log"/> directive. |
523 | 57 Debugged connections are specified by IPv4 or IPv6 (1.3.0, 1.2.1) |
58 address or network. | |
516
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59 A connection may also be specified using a hostname, in which case the |
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60 first IPv4 address corresponding to a name is used. |
523 | 61 For connections using UNIX-domain sockets (1.3.0, 1.2.1), |
62 debugging log is enabled by the “<literal>unix:</literal>” parameter. | |
516
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63 <example> |
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64 events { |
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65 debug_connection 127.0.0.1; |
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66 debug_connection localhost; |
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67 debug_connection 192.0.2.0/24; |
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68 debug_connection ::1; |
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69 debug_connection 2001:0db8::/32; |
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70 debug_connection unix:; |
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71 ... |
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72 } |
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73 </example> |
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74 <note> |
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75 For this directive to work, nginx needs to |
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76 be built with <literal>--with-debug</literal>. |
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77 </note> |
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78 </para> |
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79 |
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80 </directive> |
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81 |
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82 |
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83 <directive name="error_log"> |
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84 <syntax> |
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85 <value>file</value> | <literal>stderr</literal> |
271 | 86 [<literal>debug</literal> | |
87 <literal>info</literal> | | |
88 <literal>notice</literal> | | |
89 <literal>warn</literal> | | |
90 <literal>error</literal> | | |
91 <literal>crit</literal> | | |
92 <literal>alert</literal> | | |
93 <literal>emerg</literal>]</syntax> | |
158
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94 <default>logs/error.log error</default> |
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95 <context>main</context> |
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96 <context>http</context> |
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97 <context>server</context> |
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98 <context>location</context> |
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99 |
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100 <para> |
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101 Configures logging. |
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102 </para> |
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103 |
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104 <para> |
271 | 105 The first parameter defines a file that will store the log. |
158
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106 <!-- |
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107 If filename is not absolute, it is prefixed with the prefix path. |
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108 --> |
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109 The special value <literal>stderr</literal> selects the standard error file. |
158
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110 </para> |
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111 |
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112 <para> |
271 | 113 The second parameter determines the level of logging. |
158
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114 Log levels above are listed in the order of increasing severity. |
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115 Setting a certain log level will cause all messages of |
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116 the specified and more severe log levels to be logged. |
271 | 117 For example, the default level <literal>error</literal> will |
118 cause <literal>error</literal>, <literal>crit</literal>, | |
119 <literal>alert</literal>, and <literal>emerg</literal> messages | |
158
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120 to be logged. |
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121 If this parameter is omitted then <literal>error</literal> is used. |
158
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122 <note> |
271 | 123 For <literal>debug</literal> logging to work, nginx needs to |
124 be built with <literal>--with-debug</literal>. | |
158
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125 </note> |
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126 </para> |
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127 |
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128 </directive> |
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129 |
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130 |
63
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131 <directive name="env"> |
271 | 132 <syntax><value>variable</value>[=<value>value</value>]</syntax> |
102
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133 <default>TZ</default> |
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134 <context>main</context> |
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135 |
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136 <para> |
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137 Allows to limit a set of environment variables, change their values, |
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138 or create new environment variables, for the following cases: |
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139 <list type="bullet"> |
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140 |
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141 <listitem> |
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142 variable inheritance during a |
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143 <link doc="control.xml" id="upgrade">live upgrade</link> |
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144 of an executable file; |
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145 </listitem> |
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146 |
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147 <listitem> |
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148 use of variables by the module |
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149 <link doc="http/ngx_http_perl_module.xml">ngx_http_perl_module</link>; |
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150 </listitem> |
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151 |
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152 <listitem> |
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153 use of variables by worker processes. |
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154 Please bear in mind that controlling system libraries in this way |
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155 is not always possible as it is not uncommon for libraries to check |
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156 variables only during initialization, well before they can be set |
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157 using this directive. |
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158 An exception from this is an above mentioned |
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159 <link doc="control.xml" id="upgrade">live upgrade</link> |
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160 of an executable file. |
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161 </listitem> |
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162 |
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163 </list> |
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164 </para> |
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165 |
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166 <para> |
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167 The TZ variable is always inherited and made available to the module |
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168 <link doc="http/ngx_http_perl_module.xml">ngx_http_perl_module</link>, |
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169 unless configured explicitly. |
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170 </para> |
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171 |
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172 <para> |
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173 Usage example: |
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174 <example> |
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175 env MALLOC_OPTIONS; |
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176 env PERL5LIB=/data/site/modules; |
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177 env OPENSSL_ALLOW_PROXY_CERTS=1; |
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178 </example> |
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179 </para> |
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180 |
444
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181 <para> |
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182 <note> |
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183 The NGINX environment variable is used internally by nginx |
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184 and should not be set directly by the user. |
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185 </note> |
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186 </para> |
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187 |
63
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188 </directive> |
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189 |
249 | 190 |
63
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191 <directive name="include"> |
271 | 192 <syntax><value>file</value> | <value>mask</value></syntax> |
63
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193 <default/> |
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194 <context/> |
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195 |
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196 <para> |
271 | 197 Includes another <value>file</value>, or files matching the |
198 specified <value>mask</value>, into configuration. | |
63
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199 Included files should consist of |
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200 syntactically correct directives and blocks. |
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201 </para> |
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202 |
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203 <para> |
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204 Usage example: |
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205 <example> |
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206 include mime.types; |
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207 include vhosts/*.conf; |
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208 </example> |
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209 </para> |
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210 |
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211 </directive> |
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212 |
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213 |
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214 <directive name="master_process"> |
271 | 215 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
102
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216 <default>on</default> |
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217 <context>main</context> |
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218 |
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219 <para> |
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220 Determines whether worker processes are started. |
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221 This directive is intended for nginx developers. |
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222 </para> |
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223 |
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224 </directive> |
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225 |
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226 |
289
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227 <directive name="pcre_jit"> |
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228 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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229 <default>off</default> |
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230 <context>main</context> |
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231 <appeared-in>1.1.12</appeared-in> |
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232 |
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233 <para> |
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234 Enables or disables the use of “just-in-time compilation” (PCRE JIT) |
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235 for regular expressions known at configuration parse time. |
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236 </para> |
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237 |
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238 <para> |
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239 PCRE JIT can speed up processing of regular expressions significantly. |
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240 <note> |
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241 The JIT is available in PCRE libraries starting from version 8.20 |
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242 built with the <literal>--enable-jit</literal> configuration parameter. |
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243 When building the PCRE library with nginx (<literal>--with-pcre=</literal>), |
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244 the JIT support should be enabled with the |
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245 <literal>--with-pcre-jit</literal> configuration parameter. |
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246 </note> |
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247 </para> |
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248 |
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249 </directive> |
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250 |
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251 |
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252 <directive name="pid"> |
271 | 253 <syntax><value>file</value></syntax> |
102
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254 <default>nginx.pid</default> |
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255 <context>main</context> |
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256 |
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257 <para> |
271 | 258 Defines a <value>file</value> that will store the process ID of the main process. |
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259 </para> |
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260 |
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261 </directive> |
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262 |
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263 |
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264 <directive name="ssl_engine"> |
271 | 265 <syntax><value>device</value></syntax> |
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266 <default/> |
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267 <context>main</context> |
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268 |
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269 <para> |
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270 Defines the name of the hardware SSL accelerator. |
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271 </para> |
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272 |
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273 </directive> |
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274 |
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275 |
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276 <directive name="timer_resolution"> |
271 | 277 <syntax><value>interval</value></syntax> |
63
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278 <default/> |
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279 <context>main</context> |
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280 |
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281 <para> |
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282 Reduces timer resolution in worker processes, thus reducing the |
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283 number of <c-func>gettimeofday</c-func> system calls made. |
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284 By default, <c-func>gettimeofday</c-func> is called each time |
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285 on receiving a kernel event. |
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286 With reduced resolution, <c-func>gettimeofday</c-func> is only |
271 | 287 called once per specified <value>interval</value>. |
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288 </para> |
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289 |
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290 <para> |
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291 Example: |
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292 <example> |
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293 timer_resolution 100ms; |
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294 </example> |
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295 </para> |
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296 |
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297 <para> |
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298 An internal implementation of interval depends on the method used: |
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299 <list type="bullet"> |
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300 |
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301 <listitem> |
271 | 302 an <c-def>EVFILT_TIMER</c-def> filter if <literal>kqueue</literal> is used; |
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303 </listitem> |
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304 |
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305 <listitem> |
271 | 306 <c-func>timer_create</c-func> if <literal>eventport</literal> is used; |
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307 </listitem> |
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308 |
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309 <listitem> |
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310 <c-func>setitimer</c-func> otherwise. |
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311 </listitem> |
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312 |
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313 </list> |
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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 |
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319 <directive name="user"> |
271 | 320 <syntax><value>user</value> [<value>group</value>]</syntax> |
102
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321 <default>nobody nobody</default> |
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322 <context>main</context> |
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323 |
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324 <para> |
271 | 325 Defines <value>user</value> and <value>group</value> |
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326 credentials used by worker processes. |
271 | 327 If <value>group</value> is omitted, a group whose name equals |
328 that of <value>user</value> is used. | |
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329 </para> |
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330 |
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331 </directive> |
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332 |
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333 |
469
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334 <directive name="worker_cpu_affinity"> |
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335 <syntax><value>cpumask</value> ...</syntax> |
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336 <default/> |
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337 <context>main</context> |
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338 |
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339 <para> |
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340 Binds worker processes to the sets of CPUs. |
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341 Each CPU set is represented by a bitmask of allowed to use CPUs. |
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342 There should be a separate set defined for each of the worker processes. |
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343 By default, worker processes are not bound to any specific CPUs. |
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344 </para> |
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345 |
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346 <para> |
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347 For example, |
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348 <example> |
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349 worker_processes 4; |
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350 worker_cpu_affinity 0001 0010 0100 1000; |
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351 </example> |
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352 binds each worker process to a separate CPU, while |
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353 <example> |
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354 worker_processes 2; |
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355 worker_cpu_affinity 0101 1010; |
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356 </example> |
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357 binds the first worker process to CPU0/CPU2, |
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358 and the second worker process to CPU1/CPU3. |
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359 The second example is suitable for hyper-threading. |
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360 </para> |
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361 |
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362 <para> |
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363 <note> |
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364 The directive is only available on FreeBSD and Linux. |
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365 </note> |
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366 </para> |
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367 |
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368 </directive> |
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369 |
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370 |
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371 <directive name="worker_priority"> |
271 | 372 <syntax><value>number</value></syntax> |
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373 <default>0</default> |
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374 <context>main</context> |
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375 |
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376 <para> |
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377 Defines a scheduling priority for worker processes like is |
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378 done by the <command>nice</command> command: a negative |
271 | 379 <value>number</value> |
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380 means higher priority. |
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381 Allowed range normally varies from -20 to 20. |
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382 </para> |
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383 |
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384 <para> |
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385 Example: |
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386 <example> |
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387 worker_priority -10; |
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388 </example> |
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389 </para> |
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390 |
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391 </directive> |
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392 |
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393 |
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394 <directive name="worker_processes"> |
271 | 395 <syntax><value>number</value></syntax> |
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396 <default>1</default> |
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397 <context>main</context> |
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398 |
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399 <para> |
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400 Defines the number of worker processes. |
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401 </para> |
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402 |
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403 <para> |
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404 The optimal value depends on many factors including (but not |
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405 limited to) the number of CPU cores, the number of hard disk |
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406 drives that store data, and load pattern. |
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407 When in doubt, setting it to the number of available CPU cores |
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408 would be a good start. |
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409 </para> |
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410 |
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411 </directive> |
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412 |
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413 |
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414 <directive name="worker_rlimit_core"> |
271 | 415 <syntax><value>size</value></syntax> |
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416 <default/> |
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417 <context>main</context> |
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418 |
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419 <para> |
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420 Changes the limit on the largest size of a core file |
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421 (<c-def>RLIMIT_CORE</c-def>) for worker processes. |
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422 Used to increase the limit without restarting the main process. |
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423 </para> |
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424 |
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425 </directive> |
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426 |
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427 |
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428 <directive name="worker_rlimit_nofile"> |
271 | 429 <syntax><value>number</value></syntax> |
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430 <default/> |
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431 <context>main</context> |
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432 |
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433 <para> |
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434 Changes the limit on the maximum number of open files |
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435 (<c-def>RLIMIT_NOFILE</c-def>) for worker processes. |
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436 Used to increase the limit without restarting the main process. |
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437 </para> |
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438 |
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439 </directive> |
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440 |
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441 |
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442 <directive name="working_directory"> |
271 | 443 <syntax><value>directory</value></syntax> |
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444 <default/> |
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445 <context>main</context> |
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446 |
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447 <para> |
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448 Defines a current working directory for a worker process. |
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449 It is primarily used when writing a core-file, in which case |
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450 a worker process should have write permission for the |
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451 specified directory. |
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452 </para> |
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453 |
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454 </directive> |
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455 |
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456 </section> |
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457 |
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458 </module> |