The work the Simple API for Cloud Application Services project plans to do "is highly complementary" to the work accomplished by Eucalyptus, said Gutmans. Instead of enabling EC2 to run a workload, as Eucalyptus does, Simple API combined with adapters produced by the project will allow an application running elsewhere to make use of an application service in the Amazon cloud. Both the project and cloud suppliers themselves will provide adapters to allow Simple API to access a particular cloud.
Through Simple API, applications will be able to switch which service they want to use from one cloud with a different one without any changes required in the application's interfaces, Gutmans said. "The lack of portability across cloud application services for even the most basic operations has been an impediment to broader adoption of cloud services," he noted.
Kristof Kloeckner, CTO of IBM cloud computing, said Simple API's ability to invoke services across cloud providers "can significantly reduce the costs for application development… IBM will be contributing adapters for IBM's cloud service interfaces, as well as adapters to IBM's data storage products."
Microsoft is contributing a PHP adapter that works with Simple API to its Windows Azure cloud.
Lew Moorman, chief strategy officer for Rackspace Cloud, said PHP, already widely used to build Web sites and in Web applications, will frequently be selected as the language for cloud applications. Rackspace is one of the leading third party providers of monitoring and management tools for Amazon's EC2 operation, as well as offering its own cloud services.
Gutmans said an initial reference implementation of Simple API is available for review, comment, and contribution. Developers may deploy applications relying on Simple API to Amazon's EC2 by using a freely available Zend conversion tool to create Amazon Machine Images, the virtual machine format that EC2 uses. It's the Zend Server Community Edition Amazon Machine Image for EC2.
Both IBM and Micrsoft have lagged behind Amazon and other suppliers in getting their cloud services up and running. Microsoft will officially launch Azure at a Professional Developers Conference Nov. 16-19 in L.A. Simple API helps both Microsoft and IBM get back in the cloud computing race and ensures applications designed to work with Amazon will work in their clouds.
Simple API may also become an enabler of private clouds, where an application running on enterprise premises can call external cloud services or shift part of its workload to an external cloud.
InformationWeek has published an in-depth report on the public cloud, digging into the gritty details of cloud computing services from a dozen vendors. Download the report here (registration required).