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Summary

Nethook is a daemon that runs scripts when network interfaces change state.

Usage

When a network interface goes down, the following locations are checked for scripts. If they exist and are executable, they are run.

  • /etc/nethook/ifup.d/*
  • /etc/nethook/ifup-$DEVICE

Similarly, when a network interface goes up, the following locations are checked for scripts to run.

  • /etc/nethook/ifdown.d/*
  • /etc/nethook/ifdown-$DEVICE

Prior to running the scripts, nethook parses /etc/sysconfig/network-scripts/ifcfg-$DEVICE if it exists and makes the variables set in it available in the scripts' environment.

Requirements

Nethook was tested on Red Hat Enterprise Linux 5, aka RHEL5, but it should work on any similar distributions which

  • Place network interface configuration in /etc/sysconfig/network-scripts/ifcfg-*
  • When NICs change state, signal processes that called netreport

Nethook requires the following Perl modules, which are available in the EPEL repository.

  • perl-App-Daemon
  • perl-IO-Interface
  • perl-Log-Log4perl
  • perl-YAML

Installation

$ git clone git://github.com/sciurus/nethook.git
$ mv nethook/nethook /usr/sbin/nethook
$ mv init/sysv /etc/init.d/nethook
$ chkconfig nethook on
$ service nethook start