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Dave Jilk

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Top Stories by Dave Jilk

A leading cloud analyst recently told me that there are exactly two ways to operate software: Software-as-a-Service (SaaS) and on-premises. He said, "Either they run in the cloud and someone else takes full responsibility for the underlying physical infrastructure and system management (SaaS); or they run on your own equipment and you operate it yourself (on-prem)." I said, "Not so fast." To be sure, there are models where some of the administration is outsourced, such as shared hosting or managed services. But these approaches still leave the financial and management burden with the customer, so they are merely variants of on-premises application deployment. The public Infrastructure-as-a-Service (IaaS) model blurs the distinction between SaaS and on-premises. With IaaS, a company can remove itself completely from the financial and management aspects of operating t... (more)

The Transition from Virtual Appliances to Model-Driven Deployment

Virtual appliances are binary files representing the complete and fully configured state of a server. They are a popular approach to the deployment of application software in virtualized data centers as well as in public or private clouds, because once the "golden master" is created, deployment of that server state is fast, easy, and repeatable. However, there are significant disadvantages to the use of virtual appliances. Model-driven deployment is a new approach that largely eliminates these issues, better matches today's fast-moving, agile environments, and takes full advantag... (more)

The Cloud’s Little Secret

Think back to when you were a kid. Remember that thing you thought, felt, wanted or did that you were embarrassed about? You probably worried that you were the only person in the world who had that thought, feeling, desire or behavior. It was your Little Secret. Only as you got older did you figure out that it was actually pretty common, that everyone did that, or felt that way, at least once in a while. And that maybe it even had a name. If you're a nerd like me, you probably had more than one of these. As we've talked to customers, prospects and vendors in the industry, we've r... (more)

Web Application Lifecycle Maintenance

Like an automobile, a web application needs occasional maintenance and management over its life cycle. Although it doesn't need oil changes, it will probably need version upgrades. There may not be manufacturer recalls, but sometimes servers fail or hang. An application doesn't need to be washed and detailed, but it does need to be backed up. And both cars and applications need occasional performance tuning. This article provides a complete list of the system management functions that need to be performed on a standard architecture web application, with a particular emphasis on ... (more)

Different Approaches to Databases in PaaS: A Round-Up

In an application deployed directly on IaaS, you know and control everything about the database; in a SaaS application you know little and control nothing. But how does it work in PaaS? Since a PaaS is essentially a container that runs application code, and virtually every application requires a persistent data store, most PaaS offerings provide some kind of database services. Not surprisingly, Resource PaaS offerings most closely resemble SaaS in that they hide more deployment details, while Server PaaS offerings are more flexible but potentially more complex. (For more on Res... (more)