Node Assassin - Original

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 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:

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: 08
- Node 01: Running
- Node 02: Running
- Node 03: Running
- Node 04: Running
- Node 05: Running
- Node 06: Running
- Node 07: Running
- Node 08: 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

Feb. 27, 2010: With the na_v1.1.3 prototype complete, I will now be turning my attention to this fence agent. Progress should be noticeable from here on in.

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

Feb. 20, 2010: Current version:

This is the final revision of the Node Assassin hardware for the first release of the hardware.

v1.1.3

Availability of parts forced a slight change from v1.1.2 to this version:

  • Based on the Arduino Duemilanove using the Ethernet Shield for communication.
  • Arduino's digital pins #2-9 set to output through 330Ω resistors to 2x LTV-846 opto-isolators which opens and closes a given node's reset switch. Supports up to 8 nodes at the moment.
  • 74HC540E 8-Input Inverter for the status LEDs.
  • 1N4148 diodes prevent improper connection of the reset connectors by providing a closed circuit when the reset switch's +5vcc is connected to the ground pin.
  • 8x green and 8x red low-power LEDs are are paired up per circuit to show the status of each port.
  • 16x 330Ω resistors. Each Open/Fenced status LED pair's grounds are tied together and connected to ground via a resistor and the Arduino pins going through the optoisolators are tied to ground through a resistor.
  • An Arduino Proto Shield v.4 is used to assemble the components onto an Arduino-compatible shield. Given the size restrictions, wire-wrap wire is used to provide connections. It's messy, but it works.

Feb. 27, 2010: The initial proto-board is done!

It's alive! Here ports #02 and #05 are fenced.
Same picture, different angle.
The horrible looking, but functioning, underside!

I still need to do up proper schematics. I will do that shortly.

Per circuit design:

This is the schematic for a given circuit in this design. Credit's to Mark Loit.

Old Versions


 

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.
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