02314nas a2200229   4500000000100000008004100001260001200042653002600054653002600080653001200106653002100118653002300139653003800162653002200200100001500222700001800237700002000255245008700275856005300362520165500415022001402070       2018                            d  c01/201810aCloudy software stack10aCommon-pool resources10aCommons10acommunity clouds10acommunity networks10aSelf-organised governance systems10aSelf-provisioning1 aRoger Baig1 aFelix Freitag1 aLeandro Navarro00aCloudy in guifi.net: Establishing and sustaining a community cloud as open commons  uhttp://people.ac.upc.edu/leandro/docs/cloudy.pdf3 aCommons are natural or human-made resources that are managed cooperatively. The guifi.net community network is a successful example of a digital infrastructure, a computer network, managed as an open commons. Inspired by the guifi.net case and its commons governance model, we claim that a computing cloud, another digital infrastructure, can also be managed as an open commons if the appropriate tools are put in place. In this paper, we explore the feasibility and sustainability of community clouds as open commons: open user-driven clouds formed by community-managed computing resources. We propose organising the infrastructure as a service (IaaS) and platform as a service (PaaS) cloud service layers as common-pool resources (CPR) for enabling a sustainable cloud service provision. On this basis, we have outlined a governance framework for community clouds, and we have developed Cloudy, a cloud software stack that comprises a set of tools and components to build and operate community cloud services. Cloudy is tailored to the needs of the guifi.net community network, but it can be adopted by other communities. We have validated the feasibility of community clouds in a deployment in guifi.net of some 60 devices running Cloudy for over two years. To gain insight into the capacity of end-user services to generate enough value and utility to sustain the whole cloud ecosystem, we have developed a file storage application and tested it with a group of 10 guifi.net users. The experimental results and the experience from the action research confirm the feasibility and potential sustainability of the community cloud as an open commons.  a0167-739X