Clarity – provides a very nice web interface for the two staple tools of log analysis: grep and tail -f.

At Shopify we use syslog-ng to have a centralized logging server which collects all the logs from the various machines in our cluster and combines the log files together. We used to give everyone access to this box for log analysis but as we grew this became a bit impractical. To solve this, we created Clarity, which provides a very nice web interface for the two staple tools of log analysis: grep and tail -f.

Clarity is very lightweight and only requires a few dependencies such as eventmachine and json. It’s completely evented which means that you can have many different greps and tails running at the same time on a single instance (as much as the server can handle). It even stops the grep utility on the server when you hit stop in your browser.
(Link: Clarity – provides a very nice web interface for the two staple tools of log analysis: grep and tail -f.)