Vsmon is Linux-VServer's monitoring software. It's purpose is to monitor and manage virtual servers.
To use vsmon, you'll need to deploy one backend on each vserver host and one frontend, preferably in its own vserver. But once you have it installed, vsmon can be incredibly useful in giving you valuable insights into your vservers.
Recently, the developers of vsmon released a new update that brings a number of useful features to the table. For example, the frontend has been reworked to display a summary of all hosts, which can help you get a better overall picture of what's going on. Additionally, an owner can now be assigned to each vserver, making it easy to keep track of who is responsible for what.
Other updates include removing the libdnet dependency and the backend being available to hosts even without Linux-VServers. Plus, the tool now supports parsing of /proc/"pid"/stat for kernel 2.6.18, which can help ensure it works properly on the latest versions of various operating systems.
One of the most exciting new features is a Nagios plugin that enables the use of the vsmon backend to monitor a host disk, memory, and swap. The plugin is designed to monitor all mount points using an "intelligent" algorithm that determines warning and critical thresholds as a function of the partition's total size. This feature can be incredibly useful in preventing major issues by giving you early warning signs of potential problems.
Overall, if you're looking for a good monitoring tool for Linux-VServer, vsmon is definitely worth considering. With all of the recent updates, it's only gotten better and more useful.
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