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.
If you own a Mac and have recently tried advertising a Samba-service/share (most likely from a computer running Linux or a NAS-server), you properly also ran into the same problems that I were having, when trying to connect to it from the OSX Finder.
At 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.
I’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.
The contents of this article is only available/relevant in Danish.
Jeg har netop skiftet fra Stofanet til Telenor Bredbånd.
Jeg har egen mail-server kørende på min Internet forbindelse. Opsætningen på Stofanet’s netværk var lige til at gå til, da de har en fin vejledning på deres hjemmeside, som beskriver hvordan man gør.
Men efter mit nylige skift til Telenor fandt jeg, til min store forbavselse, at Telenor ikke har oplysninger liggende på deres hjemmeside, som beskriver hvorledes du skal konfigurere din mail-server, så den kan sende og modtage mails på deres netværk.
Ubuntu is, out of the box, pretty good at handling mobile Internet connections via bluetooth from various mobile devices. It even supports the iPhone to some extent.
I’ve been using Ubuntu’s built in functions to access the Internet from my netbook via my iPhone for quite a while now, but I have never been completely satisfied with the reliability, when connecting/disconnecting to the iPhone.
I take the train to work just about every day, and usually I would have to do some tinkering with both my iPhone and my netbook, every time I wanted to connect to the Internet.
I recently tried installing the latest version of Ubuntu on my Via EPIA 10000 M board, to use it as a Media Center. But I experienced some strange behavior.
After about 30 to 60 minutes of use, my system completely locked up.
All I could do to get the system back up, was perform a hard reboot.
I’ve always felt frustrated when using the ‘dd’ program to clone harddisks. It does it’s job beautifully and I’ve come to use it somewhat regularly at work lately, but it’s a pain to have to sit around waiting for it to finish. You simply have no clue how long it’s going to take.
If you’ve ever used ‘dd’ before, you properly know that it produces absolutely no output at all while running. Just like the ‘mv’ and ‘cp’ programs.
To my relief, I finally found a solution to make ‘dd’ display some active output. It requires a second terminal window, though.
Here’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
There are certain things I always forget.
This is one of the things that has kept me starring at a blank UNIX terminal, a few times to many. So I decided to finally document the solution I always end up searching for.
I 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.
/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.