Over the past few years, many service providers have released public cloud services in the IaaS layer, leading to commoditization and price reduction. In the IaaS layer, service providers who implement open-source-based cloud infrastructure software such as AWS, OpenStack, and CloudStack are becoming more popular, resulting in a more versatile IT infrastructure for the IaaS layer. In the future, the main battlefield of cloud services will be gradually shifted to the PaaS layer due to the difficulty of service differentiation in the IaaS layer.

Open platform as a service, such as “Cloud Foundry” by VMware and “OpenShift” by Red Hat, has been attracting attention since 2011. These are called “Open PaaS,” as opposed to “Proprietary PaaS,” by Microsoft’s Windows Azure.

Open platform as a service functions independently of the IaaS layer. Examples include Amazon EC2 and OpenStack. It adopts many development languages (Ruby, Java, Python, PHP) and open-based development frameworks (Rails, Sinatra, Spring, Node.js, Eclipse). It also can be operated by many databases, such as MySQL, PostgreSQL, and MongoDB. Developers can easily upload/use the application and scale it out based on its load.

Cloud Foundry is a Ruby-based Apache License 2.0 open-source PaaS software from VMware’s Open PaaS strategy in April 2011. It is based on the Java platform  “SpringSource Cloud Foundry” by SpringSource, which VMware took over.

According to a survey conducted by US research firm Evans Data on November 16, 2011, software developers taking part in cloud development highly recognize the Cloud Foundry as a “Top Cloud Platform.” Besides cloud service implementation, the various options of frameworks and application services also contribute to its recognition.

On February 25, 2012, NTT and NTT Communications created “Japan Cloud Foundry Group.” Participating members include Rakuten, Inc, VMware, Fujitsu social science laboratory, and NEC Soft. The goal is to promote the Cloud Foundry by sharing knowledge and offering discussion opportunities.

NTT Communications released Cloud Foundry adopted PaaS service as an option of Cloudn for Enterprise customers.

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