Authentication Monitor for Debian and Ubuntu

What is Authentication Monitor?

If you have a Linux server running Debian or Ubuntu and want to be notified when certain users gain access to one or more of your critical services (e.g. “ssh/sshd” and “proftpd”), then Authentication Monitor might be just what you’re looking for.

Authentication Monitor runs silently in the background as a system service and monitors a user-defined list of services running on you server. Whenever a user successfully authenticates with one of these services from an unknown IP-address, you will receive an e-mail notifying you of the incident.

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Linux 2.6.38 and VIA Chromotion HD 2.0 combination results in blank/black terminal

screen_shot_2011_12_06_at_8_36_20_.46vahpriunmsks84444c0g88g.17ldmg3f9ou8088wk04c40sgo.thAt work, we use HP Thin Clients with a Debian distribution on top. We sometimes buy new hardware and when faced with discontinued models, we of course have to find new ones. Last time we decided on the HP t5550 Thin Client, which were to prove a bit of a challenge when we had to upgrade our Debian installation with a newer kernel.

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How I Got “lm-sensors” Working on my Via Epia SN1800 Motherboard

via.8azvymjas0kc0s4k4s8wg8kk4.17ldmg3f9ou8088wk04c40sgo.thI’ve been the owner of a Via Epia SN1800 motherboard for quite some time now, and ever since I got it, I’ve always wanted to be able to monitor the CPU temperature from inside the operating system.

Since I’m using Linux, this means using the “lm-sensors” program, which in my experience never seems to work “out of the box” without a lot of Google searching and configuration tweaking.

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The sleeping Debian console

debian1.4j6cqlamocu8kok8wgw84c4k.17ldmg3f9ou8088wk04c40sgo.thHere’s a way of altering, or completely disabling, a feature in Debian, causing the console-monitor to black out after 15 minutes with no user inputs.

This is an old feature meant to prevent an image from being frozen solid into CRT monitors, leaving it somewhat obsolete to people using TFT monitors.

The following line completely disables this feature:

setterm -blank 0

How to avoid fsck prompts during the boot sequence

debian1.4j6cqlamocu8kok8wgw84c4k.17ldmg3f9ou8088wk04c40sgo.thI just found this wonderful word of advice, on a subject that has been bugging me for quite some time now, regarding the system disc on my Debian server.

Write FSCKFIX=yes in /etc/default/rcS. You will not face the fsck problem from the next reboot onwards. However, if the disk is corrupted very badly, your presence may be required. I had done some kernel tweaks also for that. I will write about in subsequent tips.