Virtualization and Cloud

Jonathan Gershater

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Amazon Web Services – Disaster Recovery, High Availability and Fault Tolerance Abbreviations used: AWS - Amazon Web Services AMI - Amazon Machine Instance DR - Disaster Recovery FT - Fault Tolerance HA - High Availability Non-technical introduction. High Availability and Fault Tolerance – the requirement that a computer application be seemlessly available to users without interruption, literally “no (or very little) fault will be tolerated”. In simple speak, this means that I am able to use a computer application even though in the background there may be outages, for example hardware failure, network congestion or maximum CPU utilization.  The application is “highly available”, it  is available “(almost) all the time.” Disaster Recovery – what it takes for your organization to recover from a computer disaster and be operational again. Simple example: suppose a har... (more)

Cloud Computing Easily Understood - IaaS

Infrastructure as a Service is one of the three delivery methods of cloud computing (the other two are Platform as a Service and Software as a Service). Users of IaaS have the expertise to maintain operating systems and applications, but don't wish to purchase server, storage and networking hardware and a datacenter to house the hardware. The cloud provider provides these services from a shared pool. The cloud user will then use the virtual machines to fulfill their computing requirements and may install their own operating system and will install their own applications on the v... (more)

Brief Summary of IaaS, PaaS, SaaS

In this posting, I summarize my prior three posts on the three cloud computing offerings: Infrastructure as a Service (IaaS), Platform as a Service (PaaS) and Software as a Service (SaaS). I concentrate how the three offerings differ with respect to flexibility, maintenance and portability. One of the greatest challenges companies face when moving to the cloud is security. Thus I will devote an entire blog post in the future, to security concerns. Flexibility How much flexibility do you have with each offering? What can you change or modify within each cloud offering to suit you... (more)

Examining Excellent Eucalyptus

Eucalyptus is an open source Infrastructure as a Service cloud offering. What is unique about Eucalyptus is that it is compatible with Amazon AWS APIs. This means that you can: Use Eucalyptus commands to manage Amazon or Eucalyptus instances. Freely move instances between a Eucalyptus private cloud and the Amazon Public cloud to create a hybrid cloud. Eucalyptus leverages operating system virtualization, such as KVM or XEN, to achieve isolation between applications and stacks. Operating system virtualization dedicates CPU and RAM to systems and applications such that they don't ... (more)

Three Node Install of RDO OpenStack Using PackStack

Following my single server installation of RDO OpenStack using PackStack, here is my install of OpenStack across three nodes. What's key here is the answer files used with packstack. For a single node its trivial since you just accept nearly all the defaults. A distributed install requires a bit of planning. First I installed on two nodes, using packstack from one node (sudo packstack --answer-file=/root/grizzly_openstack.cfg) The answer file for this installation is here, it specifies the location of each component: cinder on one server (.110) with this line: # The IP address of ... (more)