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Fluentd vs Logstash: What are the differences?
Fluentd: Unified logging layer. Fluentd collects events from various data sources and writes them to files, RDBMS, NoSQL, IaaS, SaaS, Hadoop and so on. Fluentd helps you unify your logging infrastructure; Logstash: Collect, Parse, & Enrich Data. Logstash is a tool for managing events and logs. You can use it to collect logs, parse them, and store them for later use (like, for searching). If you store them in Elasticsearch, you can view and analyze them with Kibana.
Fluentd and Logstash can be primarily classified as "Log Management" tools.
Some of the features offered by Fluentd are:
- Open source
- Flexible
- Minimum resources
On the other hand, Logstash provides the following key features:
- Centralize data processing of all types
- Normalize varying schema and formats
- Quickly extend to custom log formats
Fluentd and Logstash are both open source tools. Logstash with 10.3K GitHub stars and 2.76K forks on GitHub appears to be more popular than Fluentd with 7.98K GitHub stars and 930 GitHub forks.
reddit, Docplanner, and Harvest are some of the popular companies that use Logstash, whereas Fluentd is used by Repro, Geocodio, and 9GAG. Logstash has a broader approval, being mentioned in 550 company stacks & 270 developers stacks; compared to Fluentd, which is listed in 64 company stacks and 18 developer stacks.
Pros of Fluentd
- Open-source11
- Great for Kubernetes node container log forwarding9
- Lightweight9
- Easy8
Pros of Logstash
- Free68
- Easy but powerful filtering18
- Scalable12
- Kibana provides machine learning based analytics to log2
- Great to meet GDPR goals1
- Well Documented1
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Cons of Fluentd
Cons of Logstash
- Memory-intensive4
- Documentation difficult to use1