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May 2015, Volume 4, Issue 5

Container your enthusiasm: Docker doesn't want to replace the VM

Docker’s ability to bring new life to the otherwise stale technology of container virtualization has led some analysts to ask whether the company’s success could also revive the use of containers as a server consolidation tool—a claim even Docker is skeptical about. Containers have played a role for many years—especially in Linux shops running a common operating system—as a lightweight approach to ensure isolation of multiple workloads on a physical server. With hypervisor-based virtualization, a software layer (the hypervisor) abstracts the underlying physical hardware of a server, allowing for the creation of virtual machines upon which an operating system and then applications can be installed. Unlike hypervisor-based virtual machines, containers do not aim to emulate physical servers. Instead, all containerized applications on a host share a common operating system kernel. This eliminates the resources needed to run a separate operating system for each application and can greatly reduce overhead. This reduction in expenses ...

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