Holidays...

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Hi,

I'm in holdiays until the end of march, far far away from any computers ;)

Thomas.

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Setting up UPS link with an ubuntu server

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I've bought a new server (build from parts) to replace the old one that has capacitor leak issues and died †

And with it, I bought a new UPS (Uninterruptible Power Supply) to replace the old one that non longer work either...



I've googled internet to setup this UPS with my linux server (ubuntu server 8.0.4.1) and here is the result of my search and work :

When the UPS detect a power outage, it wait some times
(configured depending on the capacity of the UPS and the
power consumption of the server), and then send a mail
with the UPS state just before the shutdown,
and then shutdown the server.

While waiting some time, if the power is back,
the shutdown is cancelled.


The UPS state is useful as it shows you the health of your UPS when it goes on battery.

If the charge is really low when the server is shutdown, you might want to reduce the time it wait on battery before shutting down the server or replace the battery (or the UPS).
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Open ssh connection through proxy with NTML authentication

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Here is the explanation of how to pass a ssh connection through a proxy that use NTLM authentication protocol (cryptographic authentication) instead of a plain login/password authenication.

First follow the steps describes here :
http://blog.mansonthomas.com/2008/01/open-ssh-connection-through-http-proxy.html

Next we have to deal with NTLM authentication.

Putty do not know how to talk with proxy that use NTML authentication, so we need a soft that will handle the authentication and encapsulate the network packet.

To do that we'll use cntlm which is a port of an unix programms using cygwin (no need to make a insall of cygwin though...).

Once you unzip the files, edit the configuration file cntlm.ini

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login: Your Windows login name
domain: Your domain name

You can get theses information by hitting CTRL+ALT+SUPPR, a window display and in the first fieldset you can see something like "Thomas Manson has opened a session as DOMAIN\LOGIN"

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Limit the upload bandwidth of your apache webserver with mod_bw

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I've a server at home on a ADSL connection which has 100kBytes/s of upload and 1.2MBytes/s of download as bandwidth.

If someone download at full speed some large file on my web server, my internet connection become unusable.

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Install & enable (on Ubuntu):
sudo apt-get install libapache2-mod-bw
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Configure (your apache virtualhost conf file like /etc/apache2/sites-available/default) :
<virtualhost *:80>

#... other config stuf for the virtual host

BandWidthModule On
ForceBandWidthModule On
BandWidth 192.168.0.0/24 0
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