When you host applications in the public cloud, you assume partial
responsibility for securing the application. The cloud provider, for example
Amazon Web Services (AWS), secures the physical data center (with locked
badge entry doors, fences, guards etc) in addition to securing the physical
network with perimeter firewalls. This is no significant change from how you
secure your corporate datacenter.
Just like you enhance the security of physical and virtual servers in your
datacenter with host-based firewalls (ip tables, Windows firewall),
anti-virus and intrusion detection, so you must protect your public cloud
servers (in AWS parlance - "instances") with similar security measures. This
is the joint or shared security responsibility - AWS secures the physical
datacenter and firewalls the network; you the AWS customer secures each
instance and its application with... (more)
A first-degree direct LinkedIn connection implies that the two parties know
Using this assumption, two unconnected LinkedIn users attempt to connect via
an intermediary. What often happens is that the first degree connections are
in fact very weak connections, and thus of no use to the third party
attempting to connect via the intermediary.
I log into LinkedIn and would like an introduction to Brent.
I view Brent's profile and notice that his first degree connection, Brian, is
also a first degree connection with me.
So I ask Brian for an int... (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)
I previously wrote a review of the Microsoft Azure public cloud and
included a comparison between Azure and AWS (Amazon Web Services) and will
now compare OpenStack and VMware vCloud. For a review of IaaS (Infrastructure
as a Service) see my blog post and video.
This table provides a simple and high level comparison of OpenStack and
Feature OpenStack VMware vCloud Virtualization layer Type 2 virtualization -
Libvirt layered on top of Linux. Supports various hypervisors: XEN, KVM,
HyperV... Type 1 virtualization - bare metal; vSphere hypervisor only.
Management Open API... (more)
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)