Deploying Openstack using Packstack

OpenStack is a set of software tools for building and managing cloud computing platforms for public and private clouds. Mostly deployed as an infrastructure-as-a-service (IaaS). Deploy virtual machines and other instances that handle different tasks for managing a cloud environment on the fly. It makes horizontal scaling easy, which means that tasks that benefit from running concurrently can easily serve more or fewer users on the fly by just spinning up more instances. So we can say OpenStack is the future of cloud computing.

OpenStack began in 2010 as a joint project of Rackspace Hosting and NASA. As of 2016, it is managed by the OpenStack Foundation, a non-profit corporate entity established in September 2012. Backed by some of the biggest companies in software development and hosting like Intel, Redhat, Cisco, Ubuntu etc, as well as thousands of individual community members.

        Packstack is a utility that uses Puppet modules to deploy various parts of OpenStack on multiple pre-installed servers over SSH automatically. Currently only Fedora, Red Hat Enterprise Linux (RHEL) and Centos are supported. Continue reading…

How to fix Dirty Cow vulnerability – CVE-2016-5195

A serious vulnerability named Dirty COW has been discovered recently which has put the Linux kernel under risk. Its said that this vulnerability was noticed nine years ago (since version 2.6.22 in 2007) and remained unnoticed throughout this time. A researcher named Phil Oester was the man behind the detection of this serious threat.

According to him, the vulnerability is described as a race condition where the Linux kernel’s memory subsystem handles the copy-on-write (COW) breakage of private read-only memory mappings. In this way, the attackers gain write access to read-only memory updates and this paves way to their increased privileges on the system. Continue reading…

SmartHost :- Forwarding mails through Postfix server (From Exim)

A “Smart Host” (also known as a relay host) is a type of mail relay server which allows an SMTP server to route e-mail to an intermediate mail server rather than directly to the recipient’s server. This improves the performance of your server and the reliability of your e-mail delivery.

Exim Server (Forwarding Server)

This server will be forwarding all emails to the SmartHost for relay for final delivery. If you are not using cPanel / WHM, then you will simply edit ‘/etc/exim.conf’ instead of using cPanel / WHM’s interface. However, if the server is running cPanel / WHM you must edit the configuration file through the GUI as cPanel / WHM will revert your changes automatically over time.
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Monitor Real time resource usage in CloudLinux :: lvetop

CloudLinux is one of the widely used Operating System now-a-days due to the high level stability and advanced server security it provides, which makes it the first preference to hosting providers, especially in shared hosting environment.

LVE (Lightweight Virtual Environment) is a kernel level technology developed by the CloudLinux team. It is lightweight and transparent. The goal of LVE is to make sure that no single website can bring down your web server.

The kernel makes sure that all LVEs get fair share of the server’s resources, and that no customer can use more than the limits set for that customer.
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