Name: fluent-plugin-grok-parser
Owner: Fluentd: Unified Logging Layer
Description: Fluentd's Grok parser
Created: 2014-06-30 02:14:25.0
Updated: 2017-12-25 22:46:11.0
Pushed: 2017-07-03 02:22:04.0
Homepage: null
Size: 102
Language: Ruby
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This is a Fluentd plugin to enable Logstash's Grok-like parsing logic.
| fluent-plugin-grok-parser | fluentd | ruby | |—————————|————|——–| | >= 1.0.0 | >= v0.14.0 | >= 2.1 | | < 1.0.0 | >= v0.12.0 | >= 1.9 |
Grok is a macro to simplify and reuse regexes, originally developed by Jordan Sissel.
This is a partial implementation of Grok's grammer that should meet most of the needs.
You can use it wherever you used the format
parameter to parse texts. In the following example, it
extracts the first IP address that matches in the log.
rce>
ype tail
th /path/to/log
g grokked_log
arse>
@type grok
grok_pattern %{IP:ip_address}
parse>
urce>
For Fluentd v0.12, use following style:
rce>
ype tail
th /path/to/log
g grokked_log
rmat grok
ok_pattern %{IP:ip_address}
urce>
If you want to try multiple grok patterns and use the first matched one, you can use the following syntax:
rce>
ype tail
th /path/to/log
g grokked_log
arse>
@type grok
<grok>
pattern %{COMBINEDAPACHELOG}
time_format "%d/%b/%Y:%H:%M:%S %z"
</grok>
<grok>
pattern %{IP:ip_address}
</grok>
<grok>
pattern %{GREEDYDATA:message}
</grok>
parse>
urce>
For Fluentd v0.12, use following style:
rce>
ype tail
th /path/to/log
g grokked_log
rmat grok
rok>
pattern %{COMBINEDAPACHELOG}
time_format "%d/%b/%Y:%H:%M:%S %z"
grok>
rok>
pattern %{IP:ip_address}
grok>
rok>
pattern %{GREEDYDATA:message}
grok>
urce>
You can parse multiple line text.
rce>
ype tail
th /path/to/log
g grokked_log
arse>
@type multiline_grok
grok_pattern %{IP:ip_address}%{GREEDYDATA:message}
multiline_start_regexp /^[^\s]/
parse>
urce>
For Fluentd v0.12, use following style:
rce>
ype tail
th /path/to/log
rmat multiline_grok
ok_pattern %{IP:ip_address}%{GREEDYDATA:message}
ltiline_start_regexp /^[^\s]/
g grokked_log
urce>
You can use multiple grok patterns to parse your data.
rce>
ype tail
th /path/to/log
g grokked_log
arse>
@type multiline_grok
<grok>
pattern Started %{WORD:verb} "%{URIPATH:pathinfo}" for %{IP:ip} at %{TIMESTAMP_ISO8601:timestamp}\nProcessing by %{WORD:controller}#%{WORD:action} as %{WORD:format}%{DATA:message}Completed %{NUMBER:response} %{WORD} in %{NUMBER:elapsed} (%{DATA:elapsed_details})
</grok>
parse>
urce>
For Fluentd v0.12, use following style:
rce>
ype tail
th /path/to/log
rmat multiline_grok
rok>
pattern Started %{WORD:verb} "%{URIPATH:pathinfo}" for %{IP:ip} at %{TIMESTAMP_ISO8601:timestamp}\nProcessing by %{WORD:controller}#%{WORD:action} as %{WORD:format}%{DATA:message}Completed %{NUMBER:response} %{WORD} in %{NUMBER:elapsed} (%{DATA:elapsed_details})
grok>
g grokked_log
urce>
Fluentd accumulates data in the buffer forever to parse complete data when no pattern matches.
You can use this parser without multiline_start_regexp
when you know your data structure perfectly.
time_format
The format of the time field.
grok_pattern
The pattern of grok. You cannot specify multiple grok pattern with this.
custom_pattern_path
Path to the file that includes custom grok patterns
grok_failure_key
The key has grok failure reason. Default is nil
.
rce>
ype dummy
abel @dummy
mmy [
{ "message1": "no grok pattern matched!", "prog": "foo" },
{ "message1": "/", "prog": "bar" }
g dummy.log
urce>
el @dummy>
ilter>
@type parser
key_name message1
reserve_data true
reserve_time true
<parse>
@type grok
grok_failure_key grokfailure
<grok>
pattern %{PATH:path}
</grok>
</parse>
filter>
atch dummy.log>
@type stdout
match>
bel>
This generates following events:
-11-28 13:07:08.009131727 +0900 dummy.log: {"message1":"no grok pattern matched!","prog":"foo","message":"no grok pattern matched!","grokfailure":"No grok pattern matched"}
-11-28 13:07:09.010400923 +0900 dummy.log: {"message1":"/","prog":"bar","path":"/"}
grok/pattern
Section for grok patterns. You can use multiple grok patterns with
multiple <grok>
sections.
k>
ttern %{IP:ipaddress}
ok>
multiline_start_regexp
The regexp to match beginning of multiline. This is only for “multiline_grok”.
Grok patterns look like %{PATTERN_NAME:name}
where “:name” is optional. If “name” is provided, then it
becomes a named capture. So, for example, if you have the grok pattern
} %{HOST:host}
it matches
0.0.1 foo.example
but only extracts “foo.example” as {“host”: “foo.example”}
Please see patterns/*
for the patterns that are supported out of the box.
You can add your own Grok patterns by creating your own Grok file and telling the plugin to read it.
This is what the custom_pattern_path
parameter is for.
rce>
ype tail
th /path/to/log
arse>
@type grok
grok_pattern %{MY_SUPER_PATTERN}
custom_pattern_path /path/to/my_pattern
parse>
urce>
custom_pattern_path
can be either a directory or file. If it's a directory, it reads all the files in it.
Although every parsed field has type string
by default, you can specify other types. This is useful when filtering particular fields numerically or storing data with sensible type information.
The syntax is
_pattern %{GROK_PATTERN:NAME:TYPE}...
e.g.,
_pattern %{INT:foo:integer}
Unspecified fields are parsed at the default string type.
The list of supported types are shown below:
string
bool
integer
(“int” would NOT work!)float
time
array
For the time
and array
types, there is an optional 4th field after the type name. For the “time” type, you can specify a time format like you would in time_format
.
For the “array” type, the third field specifies the delimiter (the default is “,“). For example, if a field called “item_ids” contains the value “3,4,5”, types item_ids:array
parses it as [“3”, “4”, “5”]. Alternatively, if the value is “Adam|Alice|Bob”, types item_ids:array:|
parses it as [“Adam”, “Alice”, “Bob”].
Here is a sample config using the Grok parser with in_tail
and the types
parameter:
rce>
ype tail
th /path/to/log
rmat grok
ok_pattern %{INT:user_id:integer} paid %{NUMBER:paid_amount:float}
g payment
urce>
If you want to use this plugin with Fluentd v0.12.x or earlier, you can use this plugin version v1.0.0.
See also: Plugin Management | Fluentd
Apache 2.0 License