Yong

Yong is a powerful system/service uptime monitor that operates independently of server side software. If you're responsible for managing numerous remote servers, Yong can prove to be an invaluable tool. What sets Yong apart from other system monitoring/remote administration applications is its ability to keep you informed when remote services or servers go down.

One of the key features of Yong is its hotplugable prober, which lets you define custom protocol-based "send message", "expect message" tests to ensure that remote services are functioning as expected. For instance, when querying a remote web server for "GET /", you expect the server to respond with certain HTML codes (like ). With Yong's main configuration file - yong.conf - it's easy to set up this functionality.

Configuring Yong is simple. Within yong.conf, you can define various checks for remote servers and services including DNS server checks, NTP server time checks, and ICMP echo requests. Additionally, the hotplugable prober allows you to create protocol-based checks that can monitor TCP ports, send specific messages, and expect certain responses within a designated timeout period.

In the latest release, Yong now supports logging to the file system and includes several improvements to its sending and expecting features. If you're managing multiple remote servers and need an application to help keep them all running smoothly, Yong is definitely worth a closer look.