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in_ebpf Input Plugin for Fluent Bit (Experimental)

Note: This plugin is experimental and may be unstable. Use it in development or testing environments only, as its features and behavior are subject to change.

The in_ebpf input plugin is an experimental plugin for Fluent Bit that uses eBPF (extended Berkeley Packet Filter) to capture low-level system events. This plugin allows Fluent Bit to monitor kernel-level activities such as process executions, file accesses, memory allocations, network connections, and signal handling. It provides valuable insights into system behavior for debugging, monitoring, and security analysis.

Overview

The in_ebpf plugin leverages eBPF to trace kernel events in real-time. By specifying trace points, users can collect targeted system-level metrics and events, which can be particularly useful for gaining visibility into operating system interactions and performance characteristics.

System Dependencies

To enable in_ebpf, ensure the following dependencies are installed on your system:

  • Kernel Version: 4.18 or higher with eBPF support enabled.
  • Required Packages:
    • bpftool: Used to manage and debug eBPF programs.
    • libbpf-dev: Provides the libbpf library for loading and interacting with eBPF programs.
    • CMake 3.13 or higher: Required for building the plugin.

Installing Dependencies on Ubuntu

sudo apt update
sudo apt install libbpf-dev linux-tools-common cmake

Building Fluent Bit with in_ebpf

To enable the in_ebpf plugin, follow these steps to build Fluent Bit from source:

  1. Clone the Fluent Bit Repository
git clone https://github.com/fluent/fluent-bit.git
cd fluent-bit
  1. Configure the Build with in_ebpf

Create a build directory and run cmake with the -DFLB_IN_EBPF=On flag to enable the in_ebpf plugin:

mkdir build
cd build
cmake .. -DFLB_IN_EBPF=On
  1. Compile the Source
make
  1. Run Fluent Bit

Run Fluent Bit with elevated permissions (e.g., sudo), as loading eBPF programs requires root access or appropriate privileges:

sudo ./bin/fluent-bit -c path/to/your_config.conf

Configuration Example

Here's a basic example of how to configure the plugin:

[INPUT]
    Name          ebpf
    Trace         trace_signal
    Trace         trace_malloc
    Trace         trace_bind

The configuration above enables tracing for:

  • Signal handling events (trace_signal)
  • Memory allocation events (trace_malloc)
  • Network bind operations (trace_bind)

You can enable multiple traces by adding multiple Trace directives in your configuration. Full list of existing traces can be seen here: Fluent Bit eBPF Traces