Mercurial > hg > nginx-site
annotate xml/en/docs/debugging_log.xml @ 1521:e3d3e2ed4275
Added example configuration to mail and stream ssl modules.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Tue, 30 Jun 2015 17:08:34 +0300 |
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1 <!-- |
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2 Copyright (C) Igor Sysoev |
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3 Copyright (C) Nginx, Inc. |
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4 --> |
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5 |
50 | 6 <!DOCTYPE article SYSTEM "../../../dtd/article.dtd"> |
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8 <article name="A debugging log" |
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9 link="/en/docs/debugging_log.html" |
589 | 10 lang="en" |
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11 rev="4"> |
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12 |
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13 |
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14 <section> |
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15 |
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16 <para> |
213 | 17 To enable a debugging log, nginx needs to be configured to support |
18 debugging during the build: | |
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19 |
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20 <programlisting> |
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21 ./configure --with-debug ... |
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22 </programlisting> |
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23 |
271 | 24 Then the <literal>debug</literal> level should be set with the |
213 | 25 <link doc="ngx_core_module.xml" id="error_log"/> directive: |
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26 |
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27 <programlisting> |
213 | 28 error_log /path/to/log debug; |
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29 </programlisting> |
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30 |
213 | 31 The nginx binary version for Windows is always built with the debugging log |
271 | 32 support, so only setting the <literal>debug</literal> level will suffice. |
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33 </para> |
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34 |
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35 <para> |
271 | 36 Note that redefining the log without also specifying the |
37 <literal>debug</literal> | |
213 | 38 level will disable the debugging log. |
39 In the example below, redefining the log on the | |
40 <link doc="http/ngx_http_core_module.xml" id="server"/> | |
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41 level disables the debugging log for this server: |
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42 <programlisting> |
213 | 43 error_log /path/to/log debug; |
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44 |
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45 http { |
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46 server { |
213 | 47 error_log /path/to/log; |
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48 ... |
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49 </programlisting> |
213 | 50 To avoid this, either the line redefining the log should be |
271 | 51 commented out, or the <literal>debug</literal> level specification should |
213 | 52 also be added: |
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53 <programlisting> |
213 | 54 error_log /path/to/log debug; |
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55 |
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56 http { |
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57 server { |
213 | 58 error_log /path/to/log debug; |
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59 ... |
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60 </programlisting> |
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61 </para> |
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62 |
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63 </section> |
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64 |
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65 |
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66 <section id="clients" name="Debugging log for selected clients"> |
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67 |
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68 <para> |
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69 It is also possible to enable the debugging log for |
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70 <link doc="ngx_core_module.xml" id="debug_connection">selected |
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71 client addresses</link> only: |
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72 |
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73 <programlisting> |
213 | 74 error_log /path/to/log; |
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75 |
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76 events { |
213 | 77 debug_connection 192.168.1.1; |
78 debug_connection 192.168.10.0/24; | |
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79 } |
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80 </programlisting> |
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81 </para> |
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82 |
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83 </section> |
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84 |
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85 |
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86 <section id="memory" name="Logging to a cyclic memory buffer"> |
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87 |
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88 <para> |
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89 The debugging log can be written to a cyclic memory buffer: |
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90 <programlisting> |
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91 error_log memory:32m debug; |
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92 </programlisting> |
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93 Logging to the memory buffer on the <literal>debug</literal> level |
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94 does not have significant impact on performance even under high load. |
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95 In this case, the log can be extracted using |
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96 a <command>gdb</command> script like the following one: |
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97 <example> |
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98 set $log = ngx_cycle->log |
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99 |
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100 while $log->writer != ngx_log_memory_writer |
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101 set $log = $log->next |
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102 end |
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103 |
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104 set $buf = (ngx_log_memory_buf_t *) $log->wdata |
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105 dump binary memory debug_log.txt $buf->start $buf->end |
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106 </example> |
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107 </para> |
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108 |
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109 </section> |
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110 |
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111 </article> |