Fluentd

Unified log collector — route logs to Elasticsearch, S3, Kafka, and more

🐧 Linux🍎 Mac🪟 Windows

Reviewed: 2026-06|Tested on: Kubernetes 1.29 · Terraform 1.8 · Ubuntu 22.04

What is this?

Fluentd collects logs from servers and apps and forwards them to Elasticsearch, S3, or Kafka.

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Step 01

Install Fluentd

(01)Install Fluentd

Linux

1curl -fsSL https://toolbelt.treasuredata.com/sh/install-ubuntu-focal-td-agent4.sh | sudo sh

⚙️

Step 02

Configure Fluentd

(01)Configure Fluentd

Linux

1sudo tee /etc/td-agent/td-agent.conf << 'EOF'
2<source>
3  @type tail
4  path /var/log/syslog
5  pos_file /var/log/td-agent/syslog.pos
6  tag system.syslog
7  format none
8</source>
9<match system.**>
10  @type stdout
11</match>
12EOF
13sudo systemctl restart td-agent

✅

Step 03

Verify

(01)Verify installation

Linux

1sudo systemctl status td-agent
2sudo tail -f /var/log/td-agent/td-agent.log

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Step 04

Common Problems

#1Fluentd not collecting logs

Linux

1sudo systemctl status td-agent
2sudo tail -f /var/log/td-agent/td-agent.log
3sudo td-agent --config-test -c /etc/td-agent/td-agent.conf