Node Assassin - Original

Node Assassin :: Node Assassin - Original

-=] Paradise by the node assassin light [=-

The AN!Cluster unnamed assassin.

Node Assassin is an open-source, open-hardware project to create a network-attached cluster fence device.

Of course, you must proceed at your own risk. :)

First Version

The first version of Node Assassin is operational!

It still needs to be tied into Red Hat's 'ricci' and 'luci' programs to function as a fence device though. This fence device resides on the cluster's private network channel (or some other common intranet).

Software

This is the initial release of the fence control software; Node Assassin Operating System.

Source Code and notes:

• Naos v1.x

Version Control

All software related to this product is hosted on GitHub.

Naos v1.x Protocol

It works by listening for a connection on TCP port 238 on IP 192.168.1.66 (both port and IP are configurable). Once connected, it uses a very simple protocol.

Commands are:

Get the state of all nodes:

00:0

This will generate a message like:

Node states: 
- Max Node: 05
- Node 01: Running
- Node 02: Running
- Node 03: Running
- Node 04: Running
- Node 05: Running
End Message.

Any node that is currently fenced will read 'Fenced!'.

Fence node '02' (Supports nodes from 01 to 05):

02:0

This will generate a message like:

Node 02:0: Now Fenced!

Release '02':

02:1

This will generate a message like:

Node 02:1: Now running.

Fencing or releasing other nodes is a simple as replacing '02' above with the node number. The design allows for the expansion of ports up to 99 devices. It should be trivial to go beyond that, but it's a sufficiently high number for now.

Once a node is fenced, the caller can release and the state will be held until either another call releases the fence or the Node Assassin is reset.

Fence Agent

This is (will be...) the cman fence agent for Node Assassin.

#!/usr/bin/perl
#
# Node Assassin - Fence Agent
# Digimer; digimer@alteeve.com
# Feb. 12, 2010.
# Version: 0.1.001
#
# Bugs;
# - None known.
# 

# Play safe!
use strict;
use warnings;
use IO::Handle;

# Log file for output.
my $log_file="/tmp/fence_na.log";
my $log=IO::Handle->new();
open ($log, ">$log_file") || die "Failed to open: [$log_file] for writing; Error: $!\n";

# Let's see what we were asked to do.
print $log "Got args:\n";
print "Got args:\n";
foreach my $arg (@ARGV)
{
	print $log "- $arg\n";
	print "- $arg\n";
}
print $log "Done.\n";
print "Done.\n";
$log->close();

exit(0);

Hardware

This is v1.1 of the Node Assassin hardware.

Feb. 08, 2010: New version design has been updated to use discreet status LEDs instead of the bi-colour LEDs because there was some leakage causing the isolators to momentarily trip when the controller (re)booted.

This device is based on the Arduino Duemilanove using the Ethernet Shield for communication.

It uses the LTV-846 opto-isolators to isolate the node's power supplies. I use, though it's optional, SN74LS04 inverters to toggle between two status LEDs per port.

v1.1.2 Notes

• Look for 0805 or 1206 resistors to save space.
• Switch out the 2x SN74LS04 for 1x 74ABT540.
• Swap out the 220ohm resistors for 330ohm and add resistors to the inverter-fed status LEDs.
• Add diodes to the isolated side of the circuits to protect against incorrectly connected reset switches.
• Use 511-1334-ND bi-color LEDs with Mark's updated circuit design.

Old Designs

• NA Hardware v1.0

Pictures

This will be updated as the build comes along. Once I am done I will post a diagram. No sense sharing my bugs at this point.

The optoisolator-version of the board.

The optoisolator-version of the board, with example output in the background.

 

Input, advice, complaints and meanderings all welcome!
Digimer	digimer@alteeve.ca	https://alteeve.ca/w	legal stuff:
All info is provided "As-Is". Do not use anything here unless you are willing and able to take resposibility for your own actions. © 1997-2013
Naming credits go to Christopher Olah!
In memory of Kettle, Tonia, Josh, Leah and Harvey. In special memory of Hannah, Jack and Riley.