Amazon Web Services – Disaster Recovery, High Availability and Fault
AWS - Amazon Web Services AMI - Amazon Machine Instance DR - Disaster
Recovery FT - Fault Tolerance HA - High Availability
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
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
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)
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.
How much flexibility do you have with each offering? What can you change or
modify within each cloud offering to suit you... (more)
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)
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
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)