AN!Wiki :: Kronosnet

Locate

Home page
git clone git://github.com/fabbione/kronosnet

Install

cd ~
yum -y groupinstall "Development Tools"
yum -y install pam-devel
git clone git://github.com/fabbione/kronosnet
cd ~/kronosnet
./autogen.sh
./configure
make
make install

Create a user and group for kronosnet to run as.

groupadd -r kronosnetadm 
groupmems -g kronosnetadm -a root
### This doesn't add the user to the group for some reason...
useradd kronosnet -b /etc -M -r -s /bin/bash -g kronosnetadm
groupmems -g kronosnetadm -a kronosnet

Set a password for the new kronosnet.

passwd kronosnet

New password: 
Retype new password: 
passwd: all authentication tokens updated successfully.

For the sake of this tutorial, we'll use the password justatest.

Configure

There are two files to create. The first is a pam.d file to control access to kronosnet. The second is the actual kronosnet configuration file.

an-node03

configure
 interface knet0 0
  baseport 50000
  mtu 9000
  ip 192.168.4.73
  peer an-node04 1
   link 192.168.1.74
    exit
   link 192.168.2.74
    exit
   link 192.168.3.74
    exit
   exit
  start
  exit
 exit
exit

an-node04

configure
 interface knet0 1
  baseport 50000
  mtu 9000
  ip 192.168.4.74
  peer an-node03 0
   link 192.168.1.73
    exit
   link 192.168.2.73
    exit
   link 192.168.3.73
    exit
   exit
  start
  exit
 exit
exit

Create The pam.d Access File

ln -s /etc/pam.d/system-auth /etc/pam.d/kronosnet
ls -lah /etc/pam.d/kronosnet

lrwxrwxrwx 1 root root 22 Dec 13 15:27 /etc/pam.d/kronosnet -> /etc/pam.d/system-auth

Create The kronosnet.conf Configuation File

THIS IS ALL WRONG

The core of kronosnet is configured using the kronosnet.conf configuration file. To understand the example better, we need to define the nodes used.

There are found nodes, each with three network interfaces. These will be used to create the knet interface.

an-node03
- eth0 - 192.168.1.73
- eth1 - 192.168.2.73
- eth2 - 192.168.3.73
- knet0 - 192.168.4.73
an-node04
- eth0 - 192.168.1.74
- eth1 - 192.168.2.74
- eth2 - 192.168.3.74
- knet0 - 192.168.4.74
an-node05
- eth0 - 192.168.1.75
- eth1 - 192.168.2.75
- eth2 - 192.168.3.75
- knet0 - 192.168.4.75
an-node06
- eth0 - 192.168.1.76
- eth1 - 192.168.2.76
- eth2 - 192.168.3.76
- knet0 - 192.168.4.76

Old config deleted.

Questions:
- Confirm: nodename has no need to match any hostname. It is purely a reference withing knet.
- nodeid: Does this need to be sequential? Must it be a real number?
- knet_ips: can you have an arbitrary number?
- knet_mtu: Is 9000 the maximum? What is the default, if any?
- nodeips: These must match the IPs assigned to existing NICs, I assume?
- inet: What is this for? Over-ridding the TAP name?
- preup, up, down and postdown: Are these hooks to trigger scripts when <event> happens to the knet interface?
- When this config file changes, how is best to load in the new config?

Run the Daemon

There is currently no init.d script for kronosnetd, so it will need to be started manually.

Must run os 'root'.

kronosnetd

There is no output from that command, and it will daemonized and return you to the shell. You can check that it is running with ps.

Network Setup

In this tutorial, we'll use four nodes, each with three network cards.

an-node03
an-node04
an-node05
an-node06

To log in for the first time, use telnet to connect to the localhost on TCP port 50000.

telnet localhost 50000

Trying ::1...
Connected to localhost.
Escape character is '^]'.
Welcome to kronosnetd 0.1 (built Nov 28 2010 13:32:00)

login:

At this point, you can login using the kronostnet user name and justatest password. Once logged in successfully, you should see the knet prompt.

login:kronosnet
Password: 

Welcome kronosnet (::1) on vty(0)

knet#

To quit at any time, simply enter the telnet escape code. This is usually ^] (<ctrl> + ])

Notes

Stuff here is random

8 links per node
2^16 (64,000) nodes
git checkout 10a377ff02f98b1858009cc9bde55b75e4e5d21e
conf -> write will save the config and load it when the daemon starts
- /etc/kronosnet/kronosnet.conf
it will be possible to define it manually, for testing is set to 60 seconds, default will be 600

Any questions, feedback, advice, complaints or meanderings are welcome.
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Kronosnet

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