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:

Format

out_file format

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

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

plain format

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"}

csv format

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

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

ltsv format

Output the records as LTSV. LTSV supports an additional configuration parameter.

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

template format

Output the records using a custom format template.

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

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:

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

Configuration File

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

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