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Hackery setting up RDO Kilo on CentOS 7.2 with Mongodb && Nagios up and running

I have noticed several questions (, )
regarding mentioned ongoing issue with mongodb-server and nagios when
installing RDO Kilo 2015.1.1 on CentOS 7.2 via packstack. At the moment
I see a hack provided bellow which might be applied as pre-installation step
or a fix after initial packstack crash. Bug submitted to

Complete text may seen here


Thinking Outside The (Linux) Box

My washing machine has a leaky valve, it has had this problem for a while now. It comes and goes. Sometimes I hear it dripping water into the tank, sometimes I don’t. Now, some folks would run to call a service technician, or the more “DIY-minded” might attempt to replace the offending valve themselves. I, on the other hand, am content to let it drip until it finally fails completely which could be next week or five years from now. The drips of water are caught by the tank and are not being wasted or turning into an annoying puddle on the floor, so why worry myself about it? Every time I start a new load of clothes, which is quite frequently because I am doing laundry for three kids and two adults around here, the little bit of collected leak water is mixed with fresh and does its intended duty washing the clothes. I’m fine with that.

So, what does this have to do with Linux or computers in general? It illustrates an important truth about technology and that is that it is not and never will be perfect. Anyone who wants to use any technology to make life easier or to accomplish a task must be prepared to live with imperfection and learn how to work around it. If you can’t handle that concept then you will find yourself very frustrated. Sometimes a little analytical thinking and judicious application of pragmatic logic are necessary to get the most from a complex system.  Anyone not prepared to roll with the changes is doomed to failure.  The Linux ecosystem is vast and developers are constantly working to find new ways to get things done, deprecating the old and embracing the new. It will never be perfect, it will never be one-size-fits-all. The number of choices are dizzying and that is a good thing because it gives you options to deal with these little imperfections and stumbling blocks as the present themselves. (Read the rest at Freedom Penguin)


How to use the Photo Raw Software Darktable 2.0 on Ubuntu

Darktable is an open source RAW photo developing software that has just recently released its second major version, bringing new features, and a renovated GTK+ 3.0 user interface. On this quick guide, we will take a look on how we can use Darktable to perform basic image editing, advanced editing,...

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Server Monitoring with Munin and Monit on Ubuntu 14.04 LTS

This tutorial will show you how to monitor an Ubuntu 14.04 server with Munin and Monit. Munin produces nice graphs about nearly every aspect of your server, whereas Monit checks the availability of services like Apache, MySQL, Postfix and takes the appropriate action such as a restart if it finds...

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Getting Started with WP-CLI on Ubuntu 15.10

WP-CLI is a tool to provide a command line interface to install and manage a WordPress site. This tutorial explains the installation of Wordpress on a LEMP (Linux + Nginx + MySQL + PHP) server with WP-CLI and shows how to install plugins and themes with WP-CLI on the command...

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How to delete a single command from history on a Linux bash shell

I'm working in Ubuntu bash terminal application and remotely on a RHEL server in cloud platform. I typed the wrong and dangerous command. I no longer wish to remember dangerous command in the history file. How can I remove or delete a single command from bash history file?

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Storage Node (LVMiSCSI) deployment for RDO Kilo on CentOS 7.2

RDO deployment bellow has been done via straightforward RDO Kilo packstack run demonstrates that Storage Node might work as traditional iSCSI Target Server and each Compute Node is actually iSCSI initiator client. This functionality is provided by tuning Cinder && Glance Services running on Storage Node.

Notice that Glance,Cinder,Swift Services are not running on Controller. Connection to http://StorageNode-IP:8776/v1/xxxxxx/types will be satisfied as soon as dependencies introduced by will be satisfied on Storage Node.

Complete text may seen here


Supercharge Your Command Line With Fish Shell

Linux has no lack of command-line shells. There’s ‘sh’, ‘bash’, ‘ksh’, ‘zsh’ and more. To get the most out of them, however, requires a bit of learning, time and work; something many of us don’t have time for. For those of us who want the power and pretty without the pain, there’s one shell that might be just what the doctor ordered.

At one time or another most Linux users will—either out of need or curiosity—venture onto the command-line. Unless their distribution has changed or modified the defaults, for most users it will mean being confronted with a pretty stark Bash prompt. Bash has been the de facto default shell for the majority of Linux distros for good reason. It’s extremely stable, powerful and flexible, while also being almost %100 POSIX standards-compliant. Some distros go the extra step and try to make bash a bit more user friendly, with coloring and things like tab completions to make finding commands and files easier. For the most casual of users, that alone might be enough. For those who would like a little more usability and friendliness from their terminal but aren’t command-line enthusiasts, trying to modify or enhance bash can be akin to trying to learn Cuneiform. There are other shells as mentioned above, like the very popular zsh. However, just like bash, getting  some ease-of-use and friendliness out of them is going to require a fair amount of tinkering. Fortunately, for those of us who want some of those cool features without having to get intimate with configuration files, there’s fish. (Read the rest at Freedom Penguin)


How to Install Magento with Nginx on Ubuntu 15.10

Magento is an open source e-commerce software and content management system for e-commerce websites based on the PHP Zend Framework. It uses MySQL or MariaDB as database backend. The Magento development has been started in 2008 by Varien. Inc. In this tutorial, I will show you how to install Magento...

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How to use KVM from the command line on Debian or Ubuntu

There are different ways to manage virtual machines (VMs) running on KVM hypervisor. For example, virt-manager is a popular GUI-based front-end for VM management. However, if you would like to use KVM on a headless server, GUI-based solutions will not be ideal. In fact, you can create and manage KVM...

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What are good web server benchmarking tools for Linux

As far as web server performance is concerned, there are many different factors at play, e.g., front-end application design, network latency/bandwidth, web server configuration, backend caching, raw hardware capability, server load of shared hosting, etc. To compare and optimize web server performance under such a wide array of factors, we...

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