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Copyright 2026 mukul975
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@@ -0,0 +1,40 @@
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---
|
||||
name: implementing-log-forwarding-with-fluentd
|
||||
description: Configure Fluentd and Fluent Bit for centralized log aggregation, routing, filtering, and enrichment across distributed infrastructure
|
||||
domain: cybersecurity
|
||||
subdomain: security-operations
|
||||
tags: [fluentd, fluent-bit, log-aggregation, log-forwarding, siem, centralized-logging, observability]
|
||||
version: "1.0"
|
||||
author: mahipal
|
||||
license: Apache-2.0
|
||||
---
|
||||
|
||||
# Implementing Log Forwarding with Fluentd
|
||||
|
||||
## Overview
|
||||
|
||||
This skill covers configuring Fluentd and Fluent Bit for centralized log collection, routing, and enrichment. Fluent Bit acts as a lightweight log forwarder on endpoints, while Fluentd serves as the central aggregator and processor. The configuration covers input plugins for syslog, file tailing, and application logs, with output routing to Elasticsearch, S3, and Splunk.
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|
||||
## Prerequisites
|
||||
|
||||
- Fluentd (td-agent) v1.16+ or Fluent Bit v3.0+
|
||||
- Python 3.8+ with fluent-logger library
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||||
- Elasticsearch or Splunk for log destination
|
||||
- Network access on port 24224 (Fluentd forward protocol)
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||||
- Ruby 2.7+ (for Fluentd plugin development)
|
||||
|
||||
## Steps
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||||
|
||||
1. **Generate Fluent Bit Configuration** — Create input, filter, and output configuration for endpoint log collection
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||||
2. **Generate Fluentd Aggregator Configuration** — Configure the central Fluentd instance with forward input, parsing, and multi-output routing
|
||||
3. **Configure Log Filtering and Enrichment** — Add record_transformer and grep filters for log enrichment and noise reduction
|
||||
4. **Validate Configuration Syntax** — Parse and validate Fluentd/Fluent Bit configuration files for syntax errors
|
||||
5. **Test Log Forwarding** — Send test events via fluent-logger Python library and verify delivery
|
||||
6. **Generate Deployment Report** — Produce configuration summary with routing topology and health metrics
|
||||
|
||||
## Expected Output
|
||||
|
||||
- Fluent Bit and Fluentd configuration files (INI/YAML format)
|
||||
- Configuration validation report
|
||||
- Log routing topology diagram (text-based)
|
||||
- Test event delivery confirmation
|
||||
@@ -0,0 +1,111 @@
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# Fluentd / Fluent Bit Log Forwarding API Reference
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## Fluent Bit CLI
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```bash
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||||
# Run Fluent Bit with config file
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fluent-bit -c /etc/fluent-bit/fluent-bit.conf
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|
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# Validate configuration syntax
|
||||
fluent-bit -c /etc/fluent-bit/fluent-bit.conf --dry-run
|
||||
|
||||
# Run with specific input and output (no config file)
|
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fluent-bit -i cpu -o stdout -f 1
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|
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# Tail a log file and forward to Fluentd
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fluent-bit -i tail -p path=/var/log/syslog -o forward -p host=fluentd.local -p port=24224
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```
|
||||
|
||||
## Fluentd CLI
|
||||
|
||||
```bash
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# Start Fluentd with config
|
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fluentd -c /etc/fluentd/fluent.conf
|
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|
||||
# Validate config file
|
||||
fluentd --dry-run -c /etc/fluentd/fluent.conf
|
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|
||||
# Install output plugin
|
||||
fluent-gem install fluent-plugin-elasticsearch
|
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fluent-gem install fluent-plugin-s3
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fluent-gem install fluent-plugin-splunk-hec
|
||||
```
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||||
|
||||
## Fluent Bit Configuration Sections
|
||||
|
||||
```ini
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[SERVICE]
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Flush 5
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Daemon Off
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Log_Level info
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[INPUT]
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Name tail
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Tag app.logs
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Path /var/log/app/*.log
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||||
Parser json
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||||
DB /var/log/flb_app.db
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|
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[FILTER]
|
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Name record_modifier
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Match *
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Record hostname ${HOSTNAME}
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[OUTPUT]
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Name forward
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Match *
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Host aggregator.local
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Port 24224
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```
|
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|
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## Fluentd Configuration Directives
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||||
|
||||
```xml
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<source>
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@type forward
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port 24224
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bind 0.0.0.0
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</source>
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||||
|
||||
<filter **>
|
||||
@type record_transformer
|
||||
<record>
|
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hostname "#{Socket.gethostname}"
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</record>
|
||||
</filter>
|
||||
|
||||
<match **>
|
||||
@type elasticsearch
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||||
host es.local
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||||
port 9200
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logstash_format true
|
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</match>
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```
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|
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## Python fluent-logger
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||||
|
||||
```python
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from fluent import sender
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from fluent import event
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# Create sender (default: localhost:24224)
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sender.setup('app', host='fluentd.local', port=24224)
|
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event.Event('access', {'user': 'admin', 'action': 'login'})
|
||||
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||||
# Direct sender usage
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||||
logger = sender.FluentSender('myapp', host='fluentd.local', port=24224)
|
||||
logger.emit('follow', {'from': 'userA', 'to': 'userB'})
|
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logger.close()
|
||||
```
|
||||
|
||||
## Forward Protocol (TCP Port 24224)
|
||||
|
||||
Messages use MessagePack encoding: `[tag, timestamp, record]`
|
||||
|
||||
```bash
|
||||
# Test connectivity
|
||||
nc -zv fluentd.local 24224
|
||||
|
||||
# Monitor Fluentd buffer status
|
||||
curl http://localhost:24220/api/plugins.json
|
||||
```
|
||||
@@ -0,0 +1,249 @@
|
||||
#!/usr/bin/env python3
|
||||
"""Fluentd/Fluent Bit log forwarding configuration generator and tester."""
|
||||
|
||||
import json
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||||
import argparse
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||||
import socket
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||||
import struct
|
||||
import time
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||||
from datetime import datetime
|
||||
|
||||
try:
|
||||
from fluent import sender, event
|
||||
HAS_FLUENT = True
|
||||
except ImportError:
|
||||
HAS_FLUENT = False
|
||||
|
||||
|
||||
def generate_fluentbit_config(inputs, output_host="127.0.0.1", output_port=24224):
|
||||
"""Generate Fluent Bit configuration for log collection and forwarding."""
|
||||
sections = ["[SERVICE]\n Flush 5\n Daemon Off\n Log_Level info\n Parsers_File parsers.conf\n"]
|
||||
|
||||
input_configs = {
|
||||
"syslog": "[INPUT]\n Name syslog\n Tag syslog.*\n Listen 0.0.0.0\n Port 5140\n Mode udp\n Parser syslog-rfc3164\n",
|
||||
"tail": "[INPUT]\n Name tail\n Tag file.*\n Path /var/log/*.log\n DB /var/log/flb_tail.db\n Read_from_Head True\n Refresh_Interval 10\n",
|
||||
"systemd": "[INPUT]\n Name systemd\n Tag systemd.*\n Systemd_Filter _SYSTEMD_UNIT=sshd.service\n Read_From_Tail On\n",
|
||||
"tcp": "[INPUT]\n Name tcp\n Tag tcp.*\n Listen 0.0.0.0\n Port 5170\n Format json\n",
|
||||
}
|
||||
|
||||
for inp in inputs:
|
||||
if inp in input_configs:
|
||||
sections.append(input_configs[inp])
|
||||
|
||||
sections.append(
|
||||
"[FILTER]\n"
|
||||
" Name record_modifier\n"
|
||||
" Match *\n"
|
||||
" Record hostname ${HOSTNAME}\n"
|
||||
" Record environment production\n"
|
||||
)
|
||||
sections.append(
|
||||
"[FILTER]\n"
|
||||
" Name grep\n"
|
||||
" Match syslog.*\n"
|
||||
" Exclude message ^healthcheck\n"
|
||||
)
|
||||
sections.append(
|
||||
f"[OUTPUT]\n"
|
||||
f" Name forward\n"
|
||||
f" Match *\n"
|
||||
f" Host {output_host}\n"
|
||||
f" Port {output_port}\n"
|
||||
f" Retry_Limit 5\n"
|
||||
)
|
||||
return "\n".join(sections)
|
||||
|
||||
|
||||
def generate_fluentd_config(outputs, bind_port=24224):
|
||||
"""Generate Fluentd aggregator configuration."""
|
||||
sections = [
|
||||
f"<source>\n"
|
||||
f" @type forward\n"
|
||||
f" port {bind_port}\n"
|
||||
f" bind 0.0.0.0\n"
|
||||
f" <security>\n"
|
||||
f" shared_key fluentd_secure_key_change_me\n"
|
||||
f" self_hostname aggregator.local\n"
|
||||
f" </security>\n"
|
||||
f"</source>\n",
|
||||
]
|
||||
|
||||
sections.append(
|
||||
"<filter **>\n"
|
||||
" @type record_transformer\n"
|
||||
" <record>\n"
|
||||
" received_at ${time}\n"
|
||||
" aggregator_host \"#{Socket.gethostname}\"\n"
|
||||
" </record>\n"
|
||||
"</filter>\n"
|
||||
)
|
||||
|
||||
output_configs = {
|
||||
"elasticsearch": (
|
||||
'<match **>\n'
|
||||
' @type elasticsearch\n'
|
||||
' host elasticsearch.local\n'
|
||||
' port 9200\n'
|
||||
' logstash_format true\n'
|
||||
' logstash_prefix fluentd\n'
|
||||
' include_tag_key true\n'
|
||||
' <buffer>\n'
|
||||
' @type file\n'
|
||||
' path /var/log/fluentd/buffer/es\n'
|
||||
' flush_interval 10s\n'
|
||||
' chunk_limit_size 8MB\n'
|
||||
' retry_max_interval 30\n'
|
||||
' retry_forever true\n'
|
||||
' </buffer>\n'
|
||||
'</match>\n'
|
||||
),
|
||||
"s3": (
|
||||
'<match **>\n'
|
||||
' @type s3\n'
|
||||
' s3_bucket security-logs-bucket\n'
|
||||
' s3_region us-east-1\n'
|
||||
' path logs/\n'
|
||||
' time_slice_format %Y%m%d%H\n'
|
||||
' <buffer time>\n'
|
||||
' @type file\n'
|
||||
' path /var/log/fluentd/buffer/s3\n'
|
||||
' timekey 3600\n'
|
||||
' timekey_wait 10m\n'
|
||||
' </buffer>\n'
|
||||
'</match>\n'
|
||||
),
|
||||
"splunk": (
|
||||
'<match **>\n'
|
||||
' @type splunk_hec\n'
|
||||
' hec_host splunk.local\n'
|
||||
' hec_port 8088\n'
|
||||
' hec_token YOUR_HEC_TOKEN\n'
|
||||
' index main\n'
|
||||
' source fluentd\n'
|
||||
' <buffer>\n'
|
||||
' @type memory\n'
|
||||
' flush_interval 5s\n'
|
||||
' </buffer>\n'
|
||||
'</match>\n'
|
||||
),
|
||||
}
|
||||
|
||||
for out in outputs:
|
||||
if out in output_configs:
|
||||
sections.append(output_configs[out])
|
||||
|
||||
return "\n".join(sections)
|
||||
|
||||
|
||||
def validate_config(config_text, config_type="fluentbit"):
|
||||
"""Validate configuration syntax for common issues."""
|
||||
errors = []
|
||||
lines = config_text.split("\n")
|
||||
open_sections = 0
|
||||
for i, line in enumerate(lines, 1):
|
||||
stripped = line.strip()
|
||||
if stripped.startswith("[") and stripped.endswith("]"):
|
||||
if config_type == "fluentbit":
|
||||
valid_sections = {"[SERVICE]", "[INPUT]", "[FILTER]", "[OUTPUT]", "[PARSER]"}
|
||||
if stripped not in valid_sections:
|
||||
errors.append(f"Line {i}: Unknown section '{stripped}'")
|
||||
if stripped.startswith("<") and not stripped.startswith("</"):
|
||||
open_sections += 1
|
||||
if stripped.startswith("</"):
|
||||
open_sections -= 1
|
||||
if open_sections < 0:
|
||||
errors.append(f"Line {i}: Unexpected closing tag")
|
||||
|
||||
if config_type == "fluentd" and open_sections != 0:
|
||||
errors.append(f"Unclosed XML-style tags: {open_sections} still open")
|
||||
|
||||
return {"valid": len(errors) == 0, "errors": errors}
|
||||
|
||||
|
||||
def send_test_event(host="127.0.0.1", port=24224, tag="test.event"):
|
||||
"""Send a test log event to Fluentd/Fluent Bit via forward protocol."""
|
||||
if HAS_FLUENT:
|
||||
fluentd_sender = sender.FluentSender(tag, host=host, port=port)
|
||||
test_data = {
|
||||
"message": "Log forwarding test event",
|
||||
"level": "info",
|
||||
"source": "fluentd-agent",
|
||||
"timestamp": datetime.utcnow().isoformat(),
|
||||
}
|
||||
result = fluentd_sender.emit("test", test_data)
|
||||
fluentd_sender.close()
|
||||
return {"sent": result, "tag": f"{tag}.test", "data": test_data}
|
||||
|
||||
try:
|
||||
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
|
||||
sock.settimeout(5)
|
||||
sock.connect((host, port))
|
||||
import msgpack
|
||||
timestamp = int(time.time())
|
||||
record = {"message": "test event", "source": "agent"}
|
||||
packed = msgpack.packb([tag, timestamp, record])
|
||||
sock.sendall(packed)
|
||||
sock.close()
|
||||
return {"sent": True, "method": "raw_msgpack"}
|
||||
except Exception as e:
|
||||
return {"sent": False, "error": str(e)}
|
||||
|
||||
|
||||
def generate_report(fb_config, fd_config, fb_valid, fd_valid, test_result):
|
||||
"""Generate deployment report."""
|
||||
return {
|
||||
"report_time": datetime.utcnow().isoformat(),
|
||||
"fluent_bit_config_lines": len(fb_config.split("\n")),
|
||||
"fluentd_config_lines": len(fd_config.split("\n")),
|
||||
"fluent_bit_validation": fb_valid,
|
||||
"fluentd_validation": fd_valid,
|
||||
"test_event_result": test_result,
|
||||
"topology": {
|
||||
"forwarders": "Fluent Bit (endpoints)",
|
||||
"aggregator": "Fluentd (central)",
|
||||
"protocol": "Forward (TCP:24224)",
|
||||
},
|
||||
}
|
||||
|
||||
|
||||
def main():
|
||||
parser = argparse.ArgumentParser(description="Fluentd/Fluent Bit Log Forwarding Agent")
|
||||
parser.add_argument("--inputs", nargs="+", default=["syslog", "tail"],
|
||||
choices=["syslog", "tail", "systemd", "tcp"],
|
||||
help="Fluent Bit input plugins to enable")
|
||||
parser.add_argument("--outputs", nargs="+", default=["elasticsearch"],
|
||||
choices=["elasticsearch", "s3", "splunk"],
|
||||
help="Fluentd output destinations")
|
||||
parser.add_argument("--aggregator-host", default="127.0.0.1")
|
||||
parser.add_argument("--aggregator-port", type=int, default=24224)
|
||||
parser.add_argument("--test-send", action="store_true", help="Send a test event")
|
||||
parser.add_argument("--output", default="fluentd_report.json")
|
||||
parser.add_argument("--write-configs", action="store_true", help="Write config files to disk")
|
||||
args = parser.parse_args()
|
||||
|
||||
fb_config = generate_fluentbit_config(args.inputs, args.aggregator_host, args.aggregator_port)
|
||||
fd_config = generate_fluentd_config(args.outputs, args.aggregator_port)
|
||||
fb_valid = validate_config(fb_config, "fluentbit")
|
||||
fd_valid = validate_config(fd_config, "fluentd")
|
||||
|
||||
test_result = {}
|
||||
if args.test_send:
|
||||
test_result = send_test_event(args.aggregator_host, args.aggregator_port)
|
||||
|
||||
if args.write_configs:
|
||||
with open("fluent-bit.conf", "w") as f:
|
||||
f.write(fb_config)
|
||||
with open("fluentd.conf", "w") as f:
|
||||
f.write(fd_config)
|
||||
print("[+] Written fluent-bit.conf and fluentd.conf")
|
||||
|
||||
report = generate_report(fb_config, fd_config, fb_valid, fd_valid, test_result)
|
||||
with open(args.output, "w") as f:
|
||||
json.dump(report, f, indent=2, default=str)
|
||||
print(f"[+] Fluent Bit: {len(args.inputs)} inputs, validation={'PASS' if fb_valid['valid'] else 'FAIL'}")
|
||||
print(f"[+] Fluentd: {len(args.outputs)} outputs, validation={'PASS' if fd_valid['valid'] else 'FAIL'}")
|
||||
print(f"[+] Report saved to {args.output}")
|
||||
|
||||
|
||||
if __name__ == "__main__":
|
||||
main()
|
||||
Reference in New Issue
Block a user