如何在 grok/logstash 中匹配換行符？

Question

我有一台遠程機器，它結合了多行事件並通過伐木工人協議發送它們。

進來的東西看起來像這樣：

{
     "message" => "2014-10-20T20:52:56.133+0000 host 2014-10-20 15:52:56,036 [ERROR   ][app.logic     ] Failed to turn message into JSON\nTraceback (most recent call last):\n  File \"somefile.py", line 249, in _get_values\n    return r.json()\n  File \"/path/to/env/lib/python3.4/site-packages/requests/models.py\", line 793, in json\n    return json.loads(self.text, **kwargs)\n  File \"/usr/local/lib/python3.4/json/__init__.py\", line 318, in loads\n    return _default_decoder.decode(s)\n  File \"/usr/local/lib/python3.4/json/decoder.py\", line 343, in decode\n    obj, end = self.raw_decode(s, idx=_w(s, 0).end())\n  File \"/usr/local/lib/python3.4/json/decoder.py\", line 361, in raw_decode\n    raise ValueError(errmsg(\"Expecting value\", s, err.value)) from None\nValueError: Expecting value: line 1 column 1 (char 0), Failed to turn message into JSON"
}

當我嘗試將消息與

grok {         
    match => [ "message", "%{TIMESTAMP_ISO8601:timestamp} \[%LOGLEVEL:loglevel}%{    SPACE}\]\[%{NOTSPACE:module}%{SPACE}\]%{GREEDYDATA:message}" ]
}

GREEDYDATA並不像我希望的那樣貪婪。

然后我嘗試使用 gsub：

mutate {
    gsub => ["message", "\n", "LINE_BREAK"]
}
# Grok goes here
mutate {
    gsub => ["message", "LINE_BREAK", "\n"]
}

但那個沒有用，而不是

The Quick brown fox
jumps over the lazy
groks

我有

The Quick brown fox\njumps over the lazy\ngroks

所以...

我如何將換行符添加回我的數據，使GREEDYDATA匹配我的換行符，或者以其他方式獲取我的消息的相關部分？

Answer 1

所有GREEDYDATA都是.* ，但是. 不匹配換行符，所以你可以用(?<message>(.|\\r|\\n)*)替換%{GREEDYDATA:message}並讓它變得真正貪婪。

Answer 2

將正則表達式標志添加到開頭允許匹配換行符：

match => [ "message", "(?m)%{TIMESTA...

Answer 3

我使用 (?m) 和 [^\\n]+ 對 Vertica 日志的最后理解

match => ["message","(?m)%{TIMESTAMP_ISO8601:ClientTimestamp}%{SPACE}(%{DATA:Action}:)?(%{DATA:ThreadID} )?(\[%{DATA:Module}\] )?(\<%{DATA:Level}\> )?(\[%{DATA:SubAction}\] )?(@%{DATA:Nodename}:)?( (?<Session>(\{.*?\} )?.*?/.*?): )?(?<message>[^\n]+)((\n)?(\t)?(?<StackTrace>[^\n]+))?"]

感謝 asperla

https://github.com/elastic/logstash/issues/2282