Re:Reasons Kubernetes is so complex
by zozbot234 on Thursday January 27, 2022 @10:16AM
(#30101519)
> There is a name for this: Single System Image. There is no need to write the operating system layer - Linux works well.
Wouldn't a true SSI need to include some version of software-implemented distributed shared memory, which in turn would need to be achieved by involving the kernel? Linux now has process checkpoint and restore which will actually work seamlessly if all resources are properly namespaced ("containerized"), but not yet DSM, so far as I can tell.
(The only alternative I can think of would involve hacking around the debug infrastructure to "attach" to other processes and somehow handle VM faults in userspace, which sounds positively terrible.)
Wouldn't a true SSI need to include some version of software-implemented distributed shared memory, which in turn would need to be achieved by involving the kernel? Linux now has process checkpoint and restore which will actually work seamlessly if all resources are properly namespaced ("containerized"), but not yet DSM, so far as I can tell.
(The only alternative I can think of would involve hacking around the debug infrastructure to "attach" to other processes and somehow handle VM faults in userspace, which sounds positively terrible.)