A few weeks back, Docker made waves in the container community when it announced it had purchased Unikernel Systems, creators of the MirageOS unikernel operating system. Although Docker had praised the unikernel for its small footprint, superior security, others had raised questions about how the technology would be used in production. “Unikernels are unfit for production,” blasted Joyent’s chief technology officer Bryan Cantrill, in a blog post, arguing that, because of their design, unikernels can’t be debugged.