Author: Ajeet Raina

User Namespace support was introduced as an experimental feature last November under Docker 1.9 version. Docker 1.10 finally brings it as a general availability to the public […]

RHEL 7 comes with MariaDB by default. Don’t get surprised if you don’t see MySQL server specific packages being displayed through YUM search utility. While most of […]

Installing Docker on Linux Kernel 2.6.x is quite unstable. Docker Inc. recommends using Linux Kernel 3.x.x to have smooth Docker functionality. I had OS images, software and […]

Docker Swarm is 1 year old now. Docker Inc. during DockerConEU, December 2014 made the announcement of Docker Swarm. A Docker Swarm is a clustering manager for Docker […]

Parted Magic is a complete hard disk management solution.Parted Magic is a small live CD/USB/PXE with its elemental purpose being to partition hard drives. As per the […]

I am not Microsoft guy but recently I have been asked by my colleague to assist him in automating Hyper-V VM provisioning process. There are various resources […]

This is a tutorial series for understanding how Docker Networking really works. I have tried to put it in very simple language so that laymen can understand […]

Building .DEB package is still a daunting process. It involves a series of compiling, linking and building the source packages. Compiling tuns your source code into object […]

You must be curious about what goes in and out of the running Docker containers. Debugging a normal Linux system processes is very much similar to debugging […]

Docker is an amazing technology and it just simplifies both workflows and communication. Traditionally, the cycle of getting an application from local development to production is a […]

Just like Docker, Amazon and Red Hat too announced the availability of Docker formatted container images. This is purely an effort to enable Docker in production and […]

I had dozens of Docker containers and images running on my host machine. I played around those images for my internal project work. I pushed it to […]

Docker is all about application. It doesn’t need BIOS, NIC and firmware to run any application. But its gives you flexibility to put any kind of application(one […]

Are you planning to setup own Docker private registry in your lab? Are you planning to bring all the in-house developers to work internally with the Docker […]

I still follow the same old traditional mediawiki software to track the roadmap, knowledge base articles, latest and updates for Linux Kernel, released operating systems etc. It […]

Are you a Microsoft enthusiast? Do you want to try running containers on Windows platform? Then you have at the right place. As of now, Docker Engine […]

Last month at San Francisco @ Dockercon15, there were numerous exciting announcement which includes runtime container called runC, Docker network, Docker Notary etc. Docker 1.7.0 was announced. There […]

It is never recommended to install openssh-server on the container for just mere shell access. It is always suggested to keep your container lightweight rather than dumping layer […]

Today we are going to look at an interesting concept of linking containers. In our previous post, we pulled LAMP which is a complete stack of Linux, […]

Yesterday evening I decided to spend time on setting up LAMP( Linux, Apache, MySQL and PHP) stack inside a docker container. I managed to create a CentOS […]

This is step by step guide on how to push Docker Image to Docker Hub registry. To get started with this post, I assume that you are well […]

This blog post describes how to automate the bare metal provisioning of physical and virtual machines through Razor. Razor is an open source tool and works perfectly […]

In my previous blog post we talked about how to pull images, create containers, start and stop the containers, today we are going to talk more about the […]

This is a step by step guide for getting started with Docker. This guide starts with a fresh CentOS 7.0 host machine, talks about how to play around […]

This blog post describes how to run Apache Hadoop over the open source distributed parallel file system like Lustre. Hadoop is a large-scale distributed, open source framework […]

Few months back I tried setting up Puppet on Solaris platform. Puppetlabs provides bits for Puppet Enterprise software for Solaris in their official website. Here is the […]

By default, the Iperf client connects to the Iperf server on the TCP port 5001 and the bandwidth displayed by Iperf is the bandwidth from the client […]

Here is a helpful script which just setup 1 OpenStack Juno controller and 1 compute node in an easy way: File: controller-node-setup #!/bin/bash #get the configuration info […]

Dockers containers are revolutionizing the cloud computing world, spreading everywhere and powering developers world-wide to automate deployment of applications as a portable self-sufficient containers. In this blog […]

Are you running out of space while creating more and more containers? Here is a guide to change the default docker installation directory so that you can […]

Are you getting the below error while starting with the fresh docker installation on CentOS 7.0? /usr/bin/docker: relocation error: /usr/bin/docker: symbol dm_task_get_info_with_deferred_remove, version Base not defined in […]

Want to know the inactive users on your Linux machine who have not been using the machine since long time? The following simple shell script, called not-this-month, […]

Are you working in restricted corporate environment? Are you looking for how to run Docker behind the firewall.You can always specify an HTTP proxy for docker to […]

Want to restrict simultaneous number of logins attempt on Linux machine? Here is the quick way of doing it. 1. Edit the file /etc/security/limits.conf to make the […]

I am very thrilled and excited about Packtpub publisher’s recently published “PowerCLI Cookbook”. I have been part of a reveiwer team and spent couple of months for […]

Welcome Readers !! This is a second series of VMware vSphere Q/A which is emphasized on ESXi internals and related feature Q/A. I hope it will help […]

What is Docker? Docker is a lightweight containerization technology that has gained widespread popularity in recent years. What does Docker uses? It uses a host of the […]

Docker is a new open source tool based on Linux container technology (LXC). LXC is an OS level virtualization method for running multiple isolated Linux operating systems […]

Looking for VMware vSphere High Availability based Interview questions? I have attempted to gather important interview questions which you might find useful for your preparation Here we […]

Setting up Salt Halite is not straightforward process. Its a WebUI for Salt master where you can easily run commands and manage minions. I assume that you […]

SaltStack is an extremely fast and scalable systems and configuration management software for predictive orchestration, cloud and data center automation, server provisioning, application deployment and much more. […]

Are you preparing for Hadoop Interview? Have you spent last several hours to get the collection of Hadoop MapReduce questions? Are you in last minute preparation for […]

In today’s session, we are going to quickstart writing a basic puppet module. A Very simple example could be creating a directory on remote Linux machines. Hence, […]

Puppet is an open source framework and toolset for managing the configuration of computer systems. Puppet can be used to manage configuration on UNIX (including OSX) and […]

Last week I thought of setting up Nagios on my Linux Box.I installed a fresh piece of RHEL on my Virtualbox and everything went fine. I thought […]

While attending RHCE examination, I faced a lot of question related to Apache. While installation and configuration of Apache was the first topic, I found this topic […]

I thought of starting my day today with Open-Xchange. I had Vmware Workstation installed on one of Windows 7 Enterprise machine. I installed a minimal Ubuntu 12.04 […]

Today we are going to learn about Puppet Modules. What is Puppet Modules? Puppetlabs defines it as “Modules are self-contained bundles of code and data. You can […]

Today is the day 1 of Learn Puppet with Me. I am starting this thread for those who want to learn Puppet smoothly. Puppet is an Automation […]

RAID 1 creates a mirror on the second drive. .You will need to create RAID aware partitions on your drives before you can create RAID and you […]

RAID 0 will create striping to increase read/write speeds as the data can be read and written on separate disks at the same time. This level of […]

I read this interesting mailing thread few weeks back. I won’t be late to share this with open source enthusiast like you. Here goes the story: I have […]

Recently one of my colleague called me up with a problem statement where he was finding difficulty configuring JBOSS through puppet. I tried to help him through […]

My friend was running a cybercafe center. He has dozens of ESXi running 100 of VMs. He was using Dell Multi-UPS Management console to handle his small […]

Installing Java Development toolkit on Linux is always matter of difficulty since Oracle provides both RPM and tarballs in their official website. Installing RPM is pretty simple […]

It has been long I was thinking of writing something about DNS(Domain Name Server). DNS is a database of the IP to Name and Name to IP […]

Today morning I started my day testing with Multicast Packet Filtering. I had buntu 12.04.1 and CentOS 6.5 in my VM running over ESX 5.5.I decided to […]

A hyperthreaded processor has the same number of function units as an older, non-hyperthreaded processor. It just has two execution contexts, so it can maybe achieve better […]

FTP refers to File Transfer Protocol. By default, Red Hat supports vsftp. If you do minimal RHEL installation, you mightn’t have vsftp related RPM packages installed. To […]

“Can Linux be installed without swap space?”. This question was asked to me on one of Linux System admin interview. It might confuse anyone who is still […]

I was just hanging around blogs until I cam across one nice piece of setting up centralized Logging setup.I thought to try it out of mine and […]

Sometimes you might need setting up Password-less SSH for running script or for application where you dont want to use password everytime. Here is a quick method […]

SmartFoxServer is a massive multiplayer platform for building games, MMO communities, virtual worlds, realtime multiplayer games. To setup SFS, in short on Linux platform like Debian, one […]

In the previous article we saw the practical implication of setting up a samba share.In this article we will explore more about the Samba with practical approach. […]

Samba is an important component to seamlessly integrate Linux/Unix Servers and Desktops into Active Directory environments using the winbind daemon.In simple words, Samba is the standard Windows […]

If you are a system admin who is still sticking to Clonezilla, you must probably look out to try FOG – a very fast and easy to […]

Puppet is an IT automation tool which has already gained popularity among the system admins, developers and Cloud architects. Whether its operating system resource handling or automating […]

Ansible is an IT automation tool. It can configure systems, deploy software, and orchestrate more advanced IT tasks such as continuous deployments or zero downtime rolling updates. […]

Yesterday I attended Open Source India 2014 event which happened in NIMHANS Convention Center, Bengaluru. If you are new to OSI, let me brief you that the […]

Getting skype working on CentOS 6.5 has been a daunting job for lot of system administrators. Usually I found system administrators posting this query in facebook and […]

Automation always saves your considerable time. Especially when you have to follow the similar step for hundreds of machine, automated scripts and tools have always been a […]

Redmine built through Ruby on Rails has been impressive free and open source web-based project management. I have been Trac quite for some time and find Redmine […]

This is an introductory post on Hadoop for new begineers who want step by step instruction for deploying Hadoop on the latest Ubuntu 14.04 box.Hadoop allows for […]