LVSmon

Description

LVSmon is a cluster monitoring daemon written originally with the intention of replacing tools like ldirectord and mon with regards to maintaining LVS tables. LVSMon is secure, reliable and scalable. LVSmon will never run away. It will never give you false output. It will not allow people to take over system. It uses very little CPU time, has a small footprint and scales better than most even considering the fact that it runs in a single thread.

Contact

You can address any bug reports, patches, questions etc.. to Gianni Tedesco <gianni at scaramanga dot co dot uk>

Copyleft - All rights reversed

LVSmon is free software released under the GNU GPL version 2.
LVSmon is Copyright © 2002 Gianni Tedesco.

Platforms

Although this software was intended to run on Linux Virtual Servers, it will actually run on any POSIX compliant platform which has an ANSI C compiler.

Download

The latest version is 0.0.2
Version 0.0.2 Source code
Version 0.0.1 Source code

Current Features

Edge triggered status notificiation
Runs in a single non-blocking thread
Does not need to run as root
Does no dynamic allocation after entering main loop
Uses very little memory (about 60 bytes per service monitored)
Scales reasonably well (poll driven)
Provably correct design, LVSmon will never run away with resources
Pauses 500ms before exiting with errors, stops runaway interactions
Portable (ANSI C/POSIX)
Timeouts enforced on connection and recieve events
Reports nature of failures (eg: conection refused)
HTTP plugin, checks response according to RFC 1945
Banner checker plugin - will work for SSH, SMTP, POP3, etc...

TODO

Better event reporting mechanism
Allow failure timeouts (eg: 3 strikes and you're out)
Allow failure timeouts (eg: no success for 5 minutes)
Support plugins that don't use TCP
Make timing more accurate
Support complex transactions
Make plugins plugins
http: Use getopt in plugins for option passing
Drop root privileges and chroot if started as root