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annotate xml/ru/docs/debugging_log.xml @ 1479:64ed0ce8ac5e

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Fixed the gdb script for dumping in-memory debug log.
author Valentin Bartenev <vbart@nginx.com>
date Fri, 15 May 2015 22:21:29 +0300
parents c79501e16e26
children 0108c6525d2a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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
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6 <!DOCTYPE article SYSTEM "../../../dtd/article.dtd">
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7
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8 <article name="Отладочный лог"
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9 link="/ru/docs/debugging_log.html"
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10 lang="ru"
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11 rev="4">
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13
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14 <section>
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15
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16 <para>
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17 Чтобы включить отладочный лог, при сборке следует сконфигурировать nginx с
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18 поддержкой отладки:
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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
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24 Затем нужно задать уровень <literal>debug</literal> с помощью
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25 директивы <link doc="ngx_core_module.xml" id="error_log"/>:
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26
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27 <programlisting>
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28 error_log /path/to/log debug;
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29 </programlisting>
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30
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31 Бинарная версия nginx для Windows всегда собирается с поддержкой отладочного
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32 лога, поэтому понадобится лишь задать уровень <literal>debug</literal>.
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33 </para>
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34
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35 <para>
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36 Обратите внимание, что переопределение лога без одновременного указания
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37 уровня <literal>debug</literal> отключит отладочный лог.
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38 В примере ниже, переопределение лога на уровне
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39 <link doc="http/ngx_http_core_module.xml" id="server"/>
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40 отключает отладочный лог для этого сервера:
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41 <programlisting>
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42 error_log /path/to/log debug;
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43
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44 http {
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45 server {
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46 error_log /path/to/log;
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47 ...
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48 </programlisting>
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49 Чтобы избежать этого, следует либо закомментировать строку, переопределяющую
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50 лог, либо добавить определение уровня <literal>debug</literal>:
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51 <programlisting>
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52 error_log /path/to/log debug;
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53
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54 http {
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55 server {
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56 error_log /path/to/log debug;
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57 ...
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58 </programlisting>
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59 </para>
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60
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61 </section>
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62
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63
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64 <section id="clients" name="Отладочный лог для определённых клиентов">
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65
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66 <para>
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67 Можно включить отладочный лог только для
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68 <link doc="ngx_core_module.xml" id="debug_connection">определённых
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69 клиентских адресов</link>:
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70
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71 <programlisting>
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72 error_log /path/to/log;
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73
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74 events {
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75 debug_connection 192.168.1.1;
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76 debug_connection 192.168.10.0/24;
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77 }
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78 </programlisting>
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79 </para>
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80
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81 </section>
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82
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83
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84 <section id="memory" name="Запись в кольцевой буфер в памяти">
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85
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86 <para>
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87 Отладочный лог можно записывать в кольцевой буфер в памяти:
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88 <programlisting>
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89 error_log memory:32m debug;
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90 </programlisting>
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91 Запись в буфер в памяти на уровне <literal>debug</literal>
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92 не оказывает существенного влияния на производительность
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93 даже при высоких нагрузках.
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94 В этом случае лог может быть извлечён при помощи
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95 <command>gdb</command>-скрипта, подобного следующему:
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96 <example>
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97 set $log = ngx_cycle->log
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98
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99 while $log->writer != ngx_log_memory_writer
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100 set $log = $log->next
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101 end
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102
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103 set $buf = (ngx_log_memory_buf_t *) $log->wdata
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104 dump binary memory debug_log.txt $buf->start $buf->end
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105 </example>
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106 </para>
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107
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108 </section>
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109
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110 </article>