Exec Wasi

The exec_wasi input plugin, allows to execute WASM program that is WASI target like as external program and collects event logs from there.

Configuration Parameters

The plugin supports the following configuration parameters:



The place of a WASM program file.


Specify the name of a parser to interpret the entry as a structured message.


Specify the whilelist of paths to be able to access paths from WASM programs.


Polling interval (seconds).


Polling interval (nanosecond).


Size of the buffer (check unit sizes for allowed values)


Only run once at startup. This allows collection of data precedent to fluent-bit's startup (bool, default: false)

Configuration Examples

Here is a configuration example. in_exec_wasi can handle parser. To retrieve from structured data from WASM program, you have to create parser.conf:

Note that Time_Format should be aligned for the format of your using timestamp. In this documents, we assume that WASM program should write JSON style strings into stdout.

    Name        wasi
    Format      json
    Time_Key    time
    Time_Format %Y-%m-%dT%H:%M:%S.%L %z

Then, you can specify the above parsers.conf in the main fluent-bit configuration:

    Flush        1
    Daemon       Off
    Parsers_File parsers.conf
    Log_Level    info
    HTTP_Server  Off
    HTTP_Port    2020

    Name exec_wasi
    Tag  exec.wasi.local
    WASI_Path /path/to/wasi/program.wasm
    Accessible_Paths .,/path/to/accessible
    Parser wasi

    Name  stdout
    Match *

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