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How is Docker different from a normal virtual machine?

I keep rereading the Docker documentation to try to understand the difference between Docker and a full VM. How does it manage to provide a full filesystem, isolated networking environment, etc. without being as heavy?

Why is deploying software to a docker image (if that's the right term) easier than simply deploying to a consistent production environment?

Answers

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    David Sciuto

  • hqiuhqiu Documentum - SME EM

    hi,

    VM have full OS virtual machine, and Docker is shared OS and library, much lighter., you can refer to attached diagram for Docker_VM.

    Docker is an open platform for developers to build, ship, and run distributed applications.
    Consisting of Docker Engine, a portable, lightweight runtime and packaging tool, Docker enables apps to be quickly assembled from components and eliminates the friction between development, QA, and production environments.
    As a result, IT can ship faster and run the same app, unchanged, on laptops, data center VMs, and any cloud.

    Tony

    Tony Qiu
    Opentext ECD - SME

  • When you consider more traditional architectures, the Hypervisor plays the role of the hardware ( ie: the Operating system supplies services for the application layers and it terminates in calls to the hardware layer on the machine) while Docker plays the role of the application server.

  • Docker is container based technology and containers are just user space of the operating system.In Docker Training, the containers running share the host OS kernel. A Virtual Machine for Docker Tutorial Videos, on the other hand, is not based on container technology. They are made up of user space plus kernel space of an operating system.

  • Docker is container based technology and containers are just user space of the operating system.In Docker Training, the containers running share the host OS kernel. A Virtual Machine for Docker Tutorial Videos, on the other hand, is not based on container technology. They are made up of user space plus kernel space of an operating system.

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