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plugin/errors: 'consolidate' option (#2192)

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- see more details at https://github.com/infobloxopen/coredns-plugin-errors/pull/3
This commit is contained in:
Ruslan Drozhdzh
2018-10-27 17:37:09 +03:00
committed by Miek Gieben
parent b0a89452ef
commit 7b25d18019
5 changed files with 582 additions and 24 deletions
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34
plugin/errors/README.md
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@@ -6,16 +6,36 @@
## Description
Any errors encountered during the query processing will be printed to standard output.
Any errors encountered during the query processing will be printed to standard output. The errors of particular type can be consolidated and printed once per some period of time.
This plugin can only be used once per Server Block.
## Syntax
The basic syntax is:
~~~
errors
~~~
Extra knobs are available with an expanded syntax:
~~~
errors {
consolidate DURATION REGEXP
}
~~~
Option `consolidate` allows collecting several error messages matching the regular expression **REGEXP** during **DURATION**. After the **DURATION** since receiving the first such message, the consolidated message will be printed to standard output, e.g.
~~~
2 errors like '^read udp .* i/o timeout$' occurred in last 30s
~~~
Multiple `consolidate` options with different **DURATION** and **REGEXP** are allowed. In case if some error message corresponds to several defined regular expressions the message will be associated with the first appropriate **REGEXP**.
For better performance, it's recomended to use the `^` or `$` metacharacters in regular expression when filtering error messages by prefix or suffix, e.g. `^failed to .*`, or `.* timeout$`.
## Examples
Use the *whoami* to respond to queries and Log errors to standard output.
@@ -26,3 +46,15 @@ Use the *whoami* to respond to queries and Log errors to standard output.
errors
}
~~~
Use the *forward* to resolve queries via 8.8.8.8 and print consolidated error messages for errors with suffix " i/o timeout" or with prefix "Failed to ".
~~~ corefile
. {
forward . 8.8.8.8
errors {
consolidate 5m ".* i/o timeout$"
consolidate 30s "^Failed to .+"
}
}
~~~