File - Fluent Bit: Official Manual

The file output plugin allows to write the data received through the input plugin to file.
Configuration Parameters
The plugin supports the following configuration parameters:
Key
Description
Path
Directory path to store files. If not set, Fluent Bit will write the files on it's own positioned directory. note: this option was added on Fluent Bit v1.4.6
File
Set file name to store the records. If not set, the file name will be the tag associated with the records.
Format
The format of the file content. See also Format section. Default: out_file.
Format
out_file format
Output time, tag and json records. There is no configuration parameters for out_file.
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tag: [time, {"key1":"value1", "key2":"value2", "key3":"value3"}]
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plain format
Output the records as JSON (without additional tag and timestamp attributes). There is no configuration parameters for plain format.
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{"key1":"value1", "key2":"value2", "key3":"value3"}
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csv format
Output the records as csv. Csv supports an additional configuration parameter.
Key
Description
Delimiter
The character to separate each data. Default: ','
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time[delimiter]"value1"[delimiter]"value2"[delimiter]"value3"
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ltsv format
Output the records as LTSV. LTSV supports an additional configuration parameter.
Key
Description
Delimiter
The character to separate each pair. Default: '\t'(TAB)
Label_Delimiter
The character to separate label and the value. Default: ':'
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field1[label_delimiter]value1[delimiter]field2[label_delimiter]value2\n
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template format
Output the records using a custom format template.
Key
Description
Template
The format string. Default: '{time} {message}'
This accepts a formatting template and fills placeholders using corresponding values in a record.
For example, if you set up the configuration as below:
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[INPUT]
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  Name mem
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​
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[OUTPUT]
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  Name file
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  Format template
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  Template {time} used={Mem.used} free={Mem.free} total={Mem.total}
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You will get the following output:
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1564462620.000254 used=1045448 free=31760160 total=32805608
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Getting Started
You can run the plugin from the command line or through the configuration file:
Command Line
From the command line you can let Fluent Bit count up a data with the following options:
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$ fluent-bit -i cpu -o file -p path=output.txt
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Configuration File
In your main configuration file append the following Input & Output sections:
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[INPUT]
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    Name cpu
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    Tag  cpu
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​
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[OUTPUT]
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    Name file
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    Match *
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    Path output_dir
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Contents

Configuration Parameters