The Walk of Death Camino del Rey
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Table of Contents
Andy's Wiki
Welcome, I'm Andy and this is my wiki.
I've published a collection of short original Debian HOWTOs. These are derived from notes I've taken during my professional life as a linux systems admin and are server orientated.
I'm also in the process of documenting several years work developing Debian Clusters for high-availability, load-balanced networks, and my experiences deploying these in a professional environment.
I have three blogs: Andy's Daily Blog, Andy's Daily Videos, Andy's Science Notes.
For friends and family I have a Photo Album and you can find contact details on Profile.
Fuchsia, from Marvin Peake's Gormenghast
Less formidable, yet sullen as her mother and as incalculable, is Titus' sister. Sensitive as was her father without his intellect, Fuschia tosses her black flag of hair, bites at her childish underlip, scowls, laughs, broods, is tender, is intemperate, suspicious and credulous all in a day. Her crimson dress inflames grey corridors, or flaring in a sunshaft through high branches makes of the deep green shadows a greeness darker yet, and a darkness greener.
How to load-balance and fail-over with LVS
Disable ARP on nodes
ARP broadcasts are special packets which are recognised by your network's switches and used to associate MAC addresses with IP address. The LVS directors will share a common IP address with each of our nodes, and so in order to avoid confusing the switch we need to disable ARP on the nodes.
To disable ARP place the following lines in /etc/sysctl.conf:
/etc/sysctl.conf
net.ipv4.conf.eth0.arp_ignore=3 net.ipv4.conf.eth0.arp_announce=2
And then reboot, or run the following command to make the change take effect immediately:
sysctl -p /etc/sysctl.conf
You can then check the settings just by outputting the appropriate files in /proc:
cat /proc/sys/net/ipv4/conf/eth0/arp_announce cat /proc/sys/net/ipv4/conf/eth0/arp_ignore
If your using Shorewall then you will also need to add arp_ignore=3 to its configuration:
/etc/shorewall/interfaces
net eth0 detect dhcp,arp_ignore=3
Article from Andy's Debian HOWTOs (http://www.besy.co.uk/debian/debian)
Notes on Fundamental Interactions
There are four fundamental interactions, as summarised below:
| Interaction | Associated Charge | Mediating Particle | Relative Strength | Range(m) |
|---|---|---|---|---|
| Gravitation | (universal) | Graviton | 1 | infinite |
| Electromagnetism | Electric | Photon | 1036 | infinite |
| Weak Nuclear Force | Flavour | W & Z bosons | 1025 | 10-18 |
| Strong Nuclear Force | Colour | Gluon | 1038 | 10-15 |
Note: The electromagnetic and weak nuclear forces have been unified.
home.txt · Last modified: 2008/03/28 23:24 by andy · [Old revisions]
