An operating system (OS) is a piece of software. It manages the computer hardware and provides common services for various applications. With the rise of cloud computing, people may wonder whether the OS is still relevant and what role it will play in the future cloud.
Key Components of OS
There are different flavors of operating systems: from real-time OS, desktop OS, all the way to a mainframe OS. The most recent OS is the Cloud OS.
In general, every OS has these common components:
- The kernel, which manages memory, processes, etc.
- Device drivers, which drive different hardware from different vendors.
- User interfaces, including command line shell and Window system.
- File system, which provides a hierarchical way to persist data.
- Security, which authenticates users and protects information.
Depending on the type of OS, you may miss something here or have something extra. For example, an embedded OS may not have a user interface and everything is controlled remotely. For the desktop OS, you may have extra commonly used applications such as a calculator, a calendar, a browser, and so on.
Squeezed Sandwich Read more...
Categories: Cloud Computing Cloud Computing, desktop, enterprise, hypervisor, IP address, IPv6, JEOS, middleware, operating system, OS, Virtualization
With the right system configuration in place, it’s time to install the applications. So why not use the same tools we used for the OS and middleware? Do we need yet another set of tools?”
It depends. You can use the same set of tools for middleware to install some applications. The middleware appears like an application to the OS as well. The difference is whether your application is stable enough and whether you need to customize per node. The tools like Puppet can be good for stable applications that can be deployed the same way across all nodes. If your application is still a work in progress and you need flexibility to tweak it, you need more specialized application provisioning tools.
The big technical difference between application and middleware provisioning tools is that application tools push the application to the nodes and remotely change anything as needed. The process is procedural.
The middleware provisioning tools normally have agents on the nodes to pull the software based on the prescribed configuration files. The process is declarative.
Beyond the “push” and “pull” difference, the application provisioning tools can also manage the lifecycles of applications (sometimes called services) distributed on different nodes with a single line of command or code. Given the nature of remote command dispatching framework, the application provisioning tool can do almost anything. If there has to be a limitation, it’s your imagination.
So if you develop applications by yourself, you most likely need application provisioning tools.
Let’s see what tools are there. Read more...
Cloud computing is an evolutionary technology because it doesn’t change the computing stack at all. It simply distributes the stacks between the service providers and the users. In some sense, it is not as impactful as virtualization technology which introduced a new hypervisor layer in the computing stack and fundamentally changed people’s perception about computing with virtual machines.
But if you look closely at the latest IaaS clouds, they do leverage virtualization as a way to effectively and efficiently deploy systems. Inside one virtual machine, the computing stacks remain the same as before: from OS to middleware to application.
Keep in mind that the application is the end while the OS and middleware are the means. Customers care about applications more than the underlying infrastructure. As long as the infrastructure can support the applications, whatever the infrastructure might be is fine technically. Then the question would shift to the economic side: whatever is the most cost effective wins in infrastructure. That’s why Linux gains more shares in the cloud than in traditional IT shops.
To get to the end, you have to take a mean. In the IaaS cloud, you have to install the underlying OS and middleware before you can run your application. For the PaaS cloud, you can get away from that by focusing on application provisioning.
Remember, the software stack inside a virtual machine doesn’t change. It needs OS, middleware and application installed and configured before the application can work. Read more...