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Create persistent swap partition on Azure Linux VM

Introduction Swap space is storage on a disk device that is used when the system’s RAM (physcial memory) is full. When a Linux system runs out of RAM, inactive memory pages are moved from the RAM to the swap space. Swap space can take the form of either a dedicated swap partition or a swap […]

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Introduction to the aptitude package manager for Ubuntu

Introduction In our ongoing series of articles covering various software management tools, we have already covered, dpkg,apt-get and apt. In this article, we’ll cover the aptitude tool for package management on our Ubuntu 16.04 system. The aptitude command is a very useful, text-based utility for managing packages on your server.  Some administrators use it as […]

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zypper package management tool examples for managing packages on SUSE Linux

Introduction The zypper package management tool performs the same function for SUSE Linux as yum and apt perform for RedHat and Debian based systems respectively. SUSE (Software and System Entwicklung (Germany) meaning Software and System Development, in English) Linux runs on top of the open-source Linux kernel. The SUSE Linux distribution is available in two […]

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12 DPKG command examples

Introduction The package manager for Debian and distros derived from Debian is called dpkg or Debian package. As users, we can use dpkg directly or use higher level programs like apt(advanced package management tool) which gives us a few more features. Utilities such as dpkg-deb and dpkg-query use dpkg as a front-end to perform some […]

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Monitoring a Remote Centos 6 server with Nagios core

Introduction In our earlier articles on nagios we explained in detail how to install nagios core on the centos 6 system and configure it. In this article we will explain step by step how to monitor a remote machine with nagios core. Prerequisites: We will be installing the packages required for configuring nagios on a […]

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Installing Nagios on Centos 7 part 3 (Nagios configuration)

Introduction In our previous two articles we’ve explained how to install Nagios core on a Centos 7 system and how to install Nagios plugin and the Nagios Remote Plugin Executor. In this article we will explain how to configure Nagios so that we can have the web interface up and running. Note that this needs […]

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Nagios installation on Centos 7 part 2 (installing plugins and NRPE)

Introduction In our previews article we walked you through installing nagios core on a Centos 7 system. In this article we will explain how to install Nagios plugins and the Nagios Remote Plugin Executor (NRPE) package. How does Nagios work? Nagios core runs from a central server which holds the configuration files. It runs active […]

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apt command examples for package management in Ubuntu

Introduction In our earlier articles on package management for Debian bases distributions, we’ve covered dpkg, apt-get, and apt-cache tools. In this article, we will cover the apt tool for managing packages on our Ubuntu 16.04 system. The command line options for apt are very similar to those available with apt-get and apt-cache because apt encompasses […]

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Setting up a local repository on Ubuntu 16.04

Introduction Having packages available locally is helpful in a number of situations. Your organization might be using certain packages which are not available on public repositories. You might also be building your own debian packages and would prefer to have them available locally on the system. In this article, we will show you how to set […]

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Creating namespaces in Linux using unshare

Introduction In a previous post, we talked about how kernel namespaces and cgroups form the building blocks of containerization in Linux. In this article, we will explore namespaces in more depth by demonstrating some examples of creating namespaces using the unshare command.Namespaces use the clone(), unshare() and netns() system calls to allow different process hierarchies […]

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Recovering a missing kernel in Centos 6

Introduction Recently when I restarted a centos 6.8 system, I was greeted with the message “Error 15:  File not found”. In this article, I will systematically describe the steps I used to recover my system. I was using a VMware virtual machine. Step 1: Identify the error My system did not boot beyond the grub […]

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dnf package manager examples

Introduction DNF is considered to become the replacement for yum as the next default package manager for yum. The dnf package manager was introduced with Fedora 18 and had been designated as the default package manager as of Fedora 22. DNF has the following advantages over its predecessor yum: Provides faster dependency resolution for packages […]

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Using Seashells to display terminal output to a web browser

Introduction Having the ability to display your terminal output to a web browser would be a neat feature to have. In this article, we will be discussing a tool named Seashells that does exactly that. Seashells lets you pipe output from command-line programs to the web in real-time, even without installing any new software on […]

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| by Scott Kilroy

Netstat : Master it with these 6 steps

Netstat is a command line utility that can be used to list out all the network connections on a system. It lists out all the tcp, udp socket connections and the unix socket connections. Netstat also displays various network related information such as network connections, routing tables, interface statistics, masquerade connections, multicast memberships etc. In this […]

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npm package manager – install and use on Centos 7

Introduction Node.js is a Javascript platform for server-side programming that allows users to build network applications quickly. JavaScript is a client-side programming language, which means it’s processed within the user’s browser. With the advent of Node.js, JavaScript can also be used as a server-side language. By leveraging Javascript on both the front-end and the back-end, […]

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| by Scott Kilroy

Mtr : Stop using ping and traceroute anymore

In today’s guide, we are going to look at the mtr command and see what it can tells us about network connections.  Mtr is a simple linux command line tool that you can use for network diagnostic and troubleshooting in linux. It comes with the options of both ping and traceroute commands. Just like a […]

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| by Scott Kilroy

Learn how to send emails using Linux in 5 minutes

If I ask you how to send an email, what would you say? You will say go to gmail or yahoo mail and send the email. But, do you know that you can send emails using your Linux command line? Yes! you heard me right. We can do this by using the mail command. In […]

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28 yum command examples for package management in Linux part 1

Introduction For managing software via the command line on our Redhat and Centos systems, we could use rpm directly or use yum which is somewhat of a feature rich front end for rpm. We covered the Linux rpm command and it’s features extensively in an earlier article. Yum is an acronym for yollowdog updater modified. […]

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| by Scott Kilroy

10 Examples of using nslookup in linux

The main use of nslookup is to help with any DNS issues you may have. You can use it to find the IP address of a host, find the domain name of an IP address, or find mail servers on a domain. This tool can be used in an interactive and a noninteractive mode. The Interactive mode […]

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10 Examples of using Iptraf to monitor network traffic in linux

IPTraf is a network monitoring utility in linux that we can use to monitor IP traffic passing over the network. By using this tool, we can we can monitor various connections like TCP, UDP, ICMP, non-IP counts and also Ethernet load information etc. you can install IPtraf using the following command: #apt install iptraf Once it is installed, you can run the […]

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