File

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	File path to output. If not set, the filename will be tag name.
Format	The format of the file content. See also Format section. Default: out_file.

Output time, tag and json records. There is no configuration parameters for out_file.

tag: [time, {"key1":"value1", "key2":"value2", "key3":"value3"}]

Output the records as JSON (without additional tag and timestamp attributes). There is no configuration parameters for plain format.

{"key1":"value1", "key2":"value2", "key3":"value3"}

Output the records as csv. Csv supports an additional configuration parameter.

Key	Description
Delimiter	The character to separate each data. Default: ‘,’

time[delimiter]"value1"[delimiter]"value2"[delimiter]"value3"

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: ‘:’

field1[label_delimiter]value1[delimiter]field2[label_delimiter]value2\n

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:

[INPUT]
  Name mem
[OUTPUT]
  Name file
  Format template
  Template {time} used={Mem.used} free={Mem.free} total={Mem.total}

You will get the following output:

1564462620.000254 used=1045448 free=31760160 total=32805608

You can run the plugin from the command line or through the configuration file:

From the command line you can let Fluent Bit count up a data with the following options:

$ fluent-bit -i cpu -o file -p path=output.txt

In your main configuration file append the following Input & Output sections:

[INPUT]
    Name cpu
    Tag  cpu
[OUTPUT]
    Name file
    Match *
    Path output.txt