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annotate xml/ru/docs/debugging_log.xml @ 3051:8a61d0ed67fa

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Free nginx: no packages are provided for now.
author Maxim Dounin <mdounin@mdounin.ru>
date Wed, 14 Feb 2024 20:06:25 +0300
parents b274d289798d
children
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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="7">
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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>
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17 Для работы отладочного лога nginx должен быть сконфигурирован с поддержкой
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18 отладки на этапе сборки:
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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 Чтобы убедиться, что поддержка отладки сконфигурирована,
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32 необходимо выполнить команду <command>nginx -V</command>:
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33
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34 <programlisting>
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35 configure arguments: --with-debug ...
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36 </programlisting>
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37
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38 Бинарная версия nginx для Windows всегда собирается с поддержкой отладочного
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39 лога, поэтому понадобится лишь задать уровень <literal>debug</literal>.
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40 </para>
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41
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42 <para>
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43 Обратите внимание, что переопределение лога без одновременного указания
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44 уровня <literal>debug</literal> отключит отладочный лог.
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45 В примере ниже, переопределение лога на уровне
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46 <link doc="http/ngx_http_core_module.xml" id="server"/>
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47 отключает отладочный лог для этого сервера:
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48 <programlisting>
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49 error_log /path/to/log debug;
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50
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51 http {
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52 server {
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53 error_log /path/to/log;
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54 ...
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55 </programlisting>
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56 Чтобы избежать этого, следует либо закомментировать строку, переопределяющую
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57 лог, либо добавить определение уровня <literal>debug</literal>:
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58 <programlisting>
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59 error_log /path/to/log debug;
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60
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61 http {
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62 server {
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63 error_log /path/to/log debug;
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64 ...
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65 </programlisting>
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66 </para>
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67
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68 </section>
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69
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70
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71 <section id="clients" name="Отладочный лог для определённых клиентов">
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72
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73 <para>
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74 Можно включить отладочный лог только для
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75 <link doc="ngx_core_module.xml" id="debug_connection">определённых
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76 клиентских адресов</link>:
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77
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78 <programlisting>
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79 error_log /path/to/log;
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80
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81 events {
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82 debug_connection 192.168.1.1;
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83 debug_connection 192.168.10.0/24;
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84 }
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85 </programlisting>
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86 </para>
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87
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88 </section>
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89
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90
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91 <section id="memory" name="Запись в кольцевой буфер в памяти">
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92
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93 <para>
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94 Отладочный лог можно записывать в кольцевой буфер в памяти:
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95 <programlisting>
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96 error_log memory:32m debug;
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97 </programlisting>
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98 Запись в буфер в памяти на уровне <literal>debug</literal>
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99 не оказывает существенного влияния на производительность
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100 даже при высоких нагрузках.
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101 В этом случае лог может быть извлечён при помощи
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102 <command>gdb</command>-скрипта, подобного следующему:
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103 <example>
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104 set $log = ngx_cycle->log
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105
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106 while $log->writer != ngx_log_memory_writer
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107 set $log = $log->next
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108 end
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109
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110 set $buf = (ngx_log_memory_buf_t *) $log->wdata
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111 dump binary memory debug_log.txt $buf->start $buf->end
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112 </example>
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113 Или при помощи такого <command>lldb</command>-скрипта:
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114 <example>
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115 expr ngx_log_t *$log = ngx_cycle->log
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116 expr while ($log->writer != ngx_log_memory_writer) { $log = $log->next; }
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117 expr ngx_log_memory_buf_t *$buf = (ngx_log_memory_buf_t *) $log->wdata
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118 memory read --force --outfile debug_log.txt --binary $buf->start $buf->end
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119 </example>
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120 </para>
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121
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122 </section>
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123
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124 </article>