Data Networking Blog
Blog for Admins
Category Archives: Linux

According to the rpm man page description: “rpm  is  a  powerful Package Manager, which can be used to build, install, query, verify, update, and erase individual software packages.  A package consists of an archive of files and meta-data used to install and erase the archive files. The meta-data includes helper scripts,  file  attributes, and  descriptive  information about […]

Standard
July 5, 2017 Linux, RHCSA
Jd

In the previous two posts we looked at the basic permissions for Linux File System and the umask concept and how that works. In this post, we will look at special permissions for Linux File System. The basic permissions are great and we can do a lot with them but then there are times when […]

Standard
June 29, 2017 Linux, RHCSA
Jd

In the previous post Linux File System Permissions – Basics we learned about the basic permissions on files and folders. How does the system know what are the default permissions when you create a file/folder? Let’s create a new file as an ordinary user.

So, I added a file called examplefile as user anna. The […]

Standard
June 29, 2017 Linux, RHCSA, Uncategorised
Jd

I have always admired the way Linux handles permissions and I feel it’s a fool proof system. I was well aware of the User, Group and Other permissions set on files and folders and I had also read about umask, special permissions and ACLs but I never bothered looking too much into details for these […]

Standard
June 23, 2017 Linux, RHCSA
Jd

.Net and Powershell are now available for Linux as open source packages. This is a good move as i think this will make a lot of people really comfortable with using Linux. Before we can install Powershell core we need the .Net core installed as Powershell is built on top of .Net sudo yum install […]

Standard
August 19, 2016 Linux, PowerShell, Script, Windows
Jd

In a previous article I showed you how to use rsync to backup your files. This works fine for most of situations but I was still unable to backup my mySql databases without first manually exporting them to a .sql format. So I decided to write a small shell script to do this for me. […]

Standard
February 19, 2015 Linux, Script, Systems, Unix
Jd

In this blog we will look at how we can find the originating country for a given IP address. I do this to quickly check this information for all IP addresses logged in my Apache logs. I will only use the command line but you can put all this in a script and do a lot […]

Standard
February 17, 2015 Linux, Systems, Unix
Jd

There are multiple ways to backup your systems and data and the one you choose to implement depends on many different factors such as the OS. Today we are looking at rsync utility to backup important data. I am not going to perform a full backup of my system as it is easier for me […]

Standard
February 6, 2015 Backup, Linux, Systems, Unix
Jd

If you are an administrator for a company or just looking after some personal servers, you will soon realise that it is important to properly manage your log files. Log files give you important information about the health and security of your system. If you have not planned for log management then chances are you […]

Standard
February 6, 2015 Linux, Systems
Jd

Updating systems is an important part of day to day administration. Normally you plan your updates and check compatibility with a lot of other software running on your server before applying updates so if you are thinking about auto updating a critical server then I would advise against it. Why? There are a lot of reasons. […]

Standard
February 5, 2015 Linux, Systems
Jd
Font Size
Decrease Size Default Size Increase Size
Select Skin
Select Underlay Background
Select Overlay Background
Scheme Switcher Toggle