Проблемы обновления

Экранирование и связанные с ним аспекты

Превышен лимит символов для параметров функций после обновления

В Zabbix 7.0 в строковые параметры функций истории было добавлено корректное экранирование обратных слешей.

Поскольку при обновлении с версий Zabbix до 7.0 добавляются дополнительные обратные слеши, это приводит к увеличению длины параметров, что может вызвать нарушение работы функций триггеров, если длина параметра превышает максимальный размер данных в 255 символов.

Чтобы показать, какие проблемы могут возникнуть при обновлении базы данных, каково их влияние, как их распознать и исправить, рассмотрим пример конфигурации с 3 элементами данных и 2 триггерами.

Настройка

1. Версия Zabbix 6.0.

2. Файл /tmp/ONE, содержащий 114 обратных слэшей с символом 'a' в конце:

\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\a

3. Элемент данных vfs.file.contents[/tmp/ONE] для чтения /tmp/ONE.

4. Два вычисляемых элемента данных:

Calc_228 — его параметр содержит 228 обратных слэшей, которые экранированы, поэтому они совпадают со 114 обратными слэшами из файла /tmp/ONE:

find(/Zabbix server/vfs.file.contents[/tmp/ONE],1m:now,"regexp","\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\a")

Calc_232 — его параметр содержит 232 обратных слэша, которые экранированы, поэтому они не совпадают со 114 обратными слэшами из файла /tmp/ONE, так как для совпадения требуется как минимум 116 реальных обратных слэшей:

find(/Zabbix server/vfs.file.contents[/tmp/ONE],1m:now,"regexp","\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\a")

5. Два триггера:

Trig_228 — аналогично Calc_228, его параметр содержит 228 обратных слэшей для совпадения со 114 реальными обратными слэшами из файла /tmp/ONE:

find(/Zabbix server/vfs.file.contents[/tmp/ONE],1m:now,"regexp","\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\a")

Trig_232 — аналогично Calc_232, его параметр содержит 232 обратных слэша для совпадения со 116 реальными обратными слэшами, поэтому он не совпадает со 114 обратными слэшами из файла /tmp/ONE:

find(/Zabbix server/vfs.file.contents[/tmp/ONE],1h:now,"regexp","\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\a")

6. Calc_228 возвращает 1, и Trig_228 срабатывает.

7. Calc_232 возвращает 0, и Trig_232 не срабатывает.

Обновление

1. Выполните обновление до 8.0.0 и проверьте журналы на наличие предупреждения:

2485502:20250228:115442.236 DBpatch_6050165(): cannot save in DB function parameter: resulting size 477 is longer than the maximum 255.
functionid:33792 function:'find'
used on host: 'Zabbix server'
  in trigger: 'TRIG_228'.
Current parameter value:
'$,1m:now,"regexp","\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\a"'
Resulting escaped value would be:
'$,1m:now,"regexp","\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\a"
DB upgrade and Zabbix server can continue to run, but to make sure this function works correctly
MANUAL INTERVENTION IS REQUIRED !
Need to manually reduce the size of this parameter with macro as a workaround.

2485502:20250228:115442.237 DBpatch_6050165(): cannot save in DB function parameter: resulting size 485 is longer than the maximum 255.
functionid:33795 function:'find'
used on host: 'Zabbix server'
  in trigger: 'TRIG_232'.
Current parameter value:
'$,1m:now,"regexp","\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\a"'
Resulting escaped value would be:
'$,1m:now,"regexp","\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\a"
DB upgrade and Zabbix server can continue to run, but to make sure this function works correctly
MANUAL INTERVENTION IS REQUIRED !
Need to manually reduce the size of this parameter with macro as a workaround.

2. Обновление базы данных завершается, и сервер Zabbix продолжает работать.

3. Calc_228 по-прежнему возвращает 1, тогда как Calc_232 возвращает 0.

4. Триггеры были обновлены следующим образом:

Trig_228:

find(/Zabbix server/vfs.file.contents[/tmp/ONE],1m:now,"regexp","\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\a")

Trig_232:

find(/Zabbix server/vfs.file.contents[/tmp/ONE],1m:now,"regexp","\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\a")

Оба триггера — Trig_228 и Trig_232 — теперь срабатывают! Это неожиданно, поэтому требуется ручное вмешательство.

Ручное вмешательство

Выражения триггеров необходимо обновить так, чтобы их обратные слеши были экранированы, однако это невозможно сделать, потому что итоговые параметры будут слишком длинными.

Поэтому необходимо добавить макросы:

{$228_BACKSLASHES_A}:

\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\a

{$232_BACKSLASHES_A}:

\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\a

и обновить выражения триггеров, чтобы использовать их:

Trig_228:

find(/Zabbix server/vfs.file.contents[/tmp/ONE],1m:now,"regexp",{$228_BACKSLASHES_A})

Trig_232:

find(/Zabbix server/vfs.file.contents[/tmp/ONE],1m:now,"regexp",{$232_BACKSLASHES_A})

Теперь оба триггера работают так же, как и раньше, — только Trig_228 срабатывает.

С вычисляемыми элементами данных проблем нет, однако их также можно обновить для единообразия:

Calc_228:

find(/Zabbix server/vfs.file.contents[/tmp/ONE],1m:now,"regexp",{$228_BACKSLASHES_A})

Calc_232:

find(/Zabbix server/vfs.file.contents[/tmp/ONE],1m:now,"regexp",{$232_BACKSLASHES_A})