Graylog
Graylog is a log management platform for collecting, indexing and analysing log data from many sources.
Legal & ethical use. Use this tool only on systems, networks and data that you own or have explicit written permission to test. Unauthorised access or scanning can break computer-misuse laws (for example Pakistan's Prevention of Electronic Crimes Act, 2016, and equivalents elsewhere). Practise in your own lab or in authorised environments such as CTFs.
What it is used for
- Centralise syslog from lab servers
- Create alerts for repeated failed logins
Key features
- Streams and pipelines
- Search and dashboards
- Alerting
Installation
See the Graylog documentation for installation (packages, Docker).
Beginner usage guide
Send syslog from a test machine to a Graylog input and build a search that counts events by source.
Example commands
Run these only against your own lab or authorised targets. Placeholder addresses such as 192.0.2.x are documentation ranges.
Search query example
message:"Failed password"Finds SSH failed-login log lines in a typical Linux auth log input.
References
Source verification
Last reviewed: 2026-10-27
Links checked over HTTP: 2026-10-27 07:51 UTC — official: 200, docs: 200, repo: 200
Commands were written from the official documentation and have not been executed on this site; test them in your lab.