Monthly Archives: August 2013

Convert multiple JPG or PNG to PDF in Linux

Convert multiple JPG or PNG to PDF in Linux
3.33 (66.67%) 3 votes

I think we all have been in the situation before, you have some scanned documents in JPG or PNG format that you need to convert into a PDF file.
There are many solutions for this on the internet, including free sites that just does it for you if you upload your images, but they almost always put some kind of watermark on the pages if you don’t pay them.
There are also a bunch of Windows applications that do this, but they are often complicated or full of ads.
This guide show you a free solution on Linux, that just works, is fast, and does not add any crap to the PDF.
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TEMPer v1.4 USB Thermometer Temperature Recorder review

TEMPer v1.4 USB Thermometer Temperature Recorder review
4 (80%) 7 votes

TEMPer v1.4 is a great little gadget.
I bought this of dx.com for under $10 with free shipping all the way to Denmark!

Here is a quick review of what i think about the device.

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Temperature measuring using Linux and Raspberry Pi

Temperature measuring using Linux and Raspberry Pi
3.65 (73%) 20 votes

The story

I have a small server room, with some rack servers, NAS’s, VMware ESXi’s and other fun stuff, but I had one problems.. in the summer it got really hot, and I had to open the window to let fresh air in, and the old out to lower the temperature again, but I never knew when it was too hot, so i had to drive by the server room once or twice a day to manually feel if it was too hot..

This was a problem, because sometimes I was not home, or sometimes I forgot, or just had no time to drive by to check the temp.
Having a temperature sensor in the room, from a freezer or something like that didn’t help me much, since I still had to drive by to check it manually.

So I had to make something I was able to get the room temperature from, over the internet/lan, and thats when I decided to make my network thermometer.

I looked for weeks on the internet for a good guide about this, but none of them worked. so I decided to write my own to help others with the same problem out.

This post will be about

How to make your own network thermometer, using open source software and a cheap USB temperature sensor!

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Mail Admin Tool (MAT) a management interface for ISPmail

Mail Admin Tool (MAT) a management interface for ISPmail
5 (100%) 2 votes

ISPmail, what is that?

ISPmail is a really good guide made by Christoph Haas that you can find at Workaround.org. A short description of what it is:

A guide to help you setup an email server, with virus and spam scanning + pop3, IMAP and smtp support for mobile devices or emails clients like Thunderbird.
It also allows for multiple domain names on the same email server!

I followed the guide and made my own email server, but the lack of a management interface for administering the email accountance, domains and aliases was making me crazy, there was no easy way to do it so i decided to make my own tool for it.

Mail Admin Tool (MAT), what can it do?

It is designed to do one thing and one thing only. Simply making it easy to manage your domains, email account and aliases when running postfix with MySQL backend that you have made when following the ISPmail guide from workaround.org

It was made with the ISPmail guide in mind, and it should work right out of the box if you followed the guide. If not, then this tool is not for you.

You can even reset mail account passwords if your users lost them with just a few clicks, easy and painless!

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MySQL data on secondary hard disk

MySQL data on secondary hard disk
3.88 (77.5%) 8 votes

Having your MySQL data on a separate partition is important, why?

Having your MySQL data on a separate partition is important because when your root partition fills up and no space is left, your system won’t be able to boot and might crash when running, you then have to boot from a recovery disk to remove files before you can boot on your normal system again.
This is critical for servers that you can’t allow to be down for an hour or two!

The solution

The solution is easy, you just move your MySQL data to a separate partition, and this problem won’t occur any longer, the only thing that happens when you run out of space, is that the MySQL can’t write any new data to the database, which is better than the entire system crashing and being unable to boot.
In this guide i will show you how to make the changes needed to get this problem resolved.

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Debian Linux server (wheezy 7.1) installation

Debian Linux server (wheezy 7.1) installation
3.67 (73.33%) 6 votes

Debian Linux (Wheezy) server is easy to install. It takes about half an hour, or two depending on what you need it for and how “special” your installation has to be. A standard installation with only one hard drive will take about 0,5-2 hours depending on your knowledge on Linux servers.

On this page I will guide you through how to do it, with screenshots and explanations on every single one.

I have choosen Debian Linux as my favorite Linux server distribution for the following reasons:

  1. It’s light. It only got the stuff you need and nothing more, which gives you a really small footprint (Debian can run on a computer with less than 200 Megabytes of memory easily!
  2. It’s reliable
  3. Updates are stable, no crossing fingers when updating the system hoping it will not break
  4. If you ever have problems with Debian, it’s really easy to find a solutions just by Googling the problem.
  5. It’s easy to use
  6. It’s fast.

I will in this guide install Debian server without any Desktop environment (no icons, no mouse. only a keyboard and a console screen) since this saves a LOT of resources (about 100-200 megabytes of memory) and the time it takes for the server to boot/startup.
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Installing VMware ESXi on a haswell and Z87 (4th generation) CPU

Installing VMware ESXi on a haswell and Z87 (4th generation) CPU
5 (100%) 2 votes

The problem

A couple of days ago, I got a package containing a new motherboard, a CPU and some RAM.
It was supposed to be used for an upgrade on one of my VMware ESXi servers, since I was running low on resources.
The package contained:

So, everything looked fine, and I was excited since this was actually my first build with a haswell (4th generation i5) CPU!
Before I ordered the hardware, I googled around to find some answers on Z87 ESXi compatibility, but was not able to find anything, so I was at the same time kind of nervous..

I took out the old parts from the server, and put in the new motherboard, CPU and memory and booted it up into bios.

i then set some settings i wanted (boot order, fan control and so on) and rebooted the server onto the VMware ESXi 5.1-update1 installer I just had burned to a CD only to discover that something was horribly wrong.

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Why did i choose the name /dev/random for this blog? And other info

Why did i choose the name /dev/random for this blog? And other info
1 (20%) 1 vote

Why did i choose that name?

There are only two main reasons why I chose /dev/random as the name for this blog:
Because it’s Linux related and the domain was not already taken – Simple as that 🙂

What will I post on this blog?

later on I will be making guides, and how-to’s on this blog.
Everything computer, hardware or linux related.
Everything that I post on this blog is something I think you might enjoy reading about as a fellow Linux user, so make sure to visit this blog every other day or subscribe to newsletters on the right!


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