Mickeycaskill writes: Walmart is effectively open sourcing its OneOps cloud platform, with the source code set to be uploaded to GitHub at the end of 2015. By making the cloud platform open source, Walmart is taking the fight to Amazon Web Services by giving developers a chance to avoid vendor lock-in. Walmart argues that OneOps has four main advantages: cloud portability, continuous lifecycle management, faster innovation, and great abstraction of cloud environments. The company says that the move should increase competition between cloud service vendors. "We're enabling any organization to achieve the same cloud portability and developer benefits that Walmart has enjoyed,"said Jeremy King, CTO of Walmart Global eCommerce and head of WalmartLabs.