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Virtualization and Cloud

Jonathan Gershater

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Overview OpenStack is an Infrastructure as a Service offering. (see my prior post for an explanation of IaaS). OpenStack is an OpenSource project, founded by RackSpace, NASA and others. OpenStack can be deployed as a public or private cloud. The OpenStack projects are: CINDER, GLANCE, KEYSTONE, NOVA, QUANTUM, SWIFT. OpenStack Compute: (NOVA) Project NOVA, or OpenStack Compute, provisions and manages on-demand virtual machines and associated resources: CPU, Memory, Disk and Network. Virtual machines can be started, stopped, suspended, created and deleted, while network options for a virtual machine are static, DHCP, or IPv6. The virtual machines run on hypervisors such as XEN or KVM, but others are supported too - even VMware ESXi! Users and administrators use the GUI to request virtual machines, while developers may typically use an API. Security? Of course there are se... (more)

Installing RDO Grizzly on Centos Using Packstack

OpenStack is easily installed using a package called Packstack. Redhat is one of the primary contributors to packstack and my install experience is similar to the installation of RDO, described here The procedure is quite simple: Install Redhat, Fedora or Centos on one or more x86 servers. I installed the minimal Centos installation on a Dell 1950 Install and configure NTP - network time protocol # yum install ntp # chkconfig ntpd on # ntpdate pool.ntp.org # /etc/init.d/ntpd start Install the Fedora repo for grizzly # yum install -y http://rdo.fedorapeople.org/openstack/opensta... (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)

Cloud Computing Easily Understood - SaaS

In prior blog posts, I described Infrastructure as a Service (IaaS) and Platform as a Service (PaaS). To recap: If I use IaaS I get servers onto which I can load software and applications which I then maintain, though I don't need to maintain the hardware. I can customize the applications and software running on the servers, at will. If I use PaaS, I get a platform of ready to use web servers, application servers, databases etc. I write my own software application and host it at the PaaS provider. I maintain the software I write, but not the application servers, databases or ha... (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)