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Documentation: Firecracker limitations #351

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egernst opened this issue Jan 23, 2019 · 4 comments

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commented Jan 23, 2019

With its limited feature support, there are expected functional limitations when using Kata Containers with the Firecracker hypervisor.

This issue serves as a location to track these limitations.

  • Volume Support and Host to Guest file sharing kata-containers/runtime#1071
    Due to lack of host to guest file sharing support in Firecracker, volumes and more importantly Kubernetes secrets and config maps do not work. This means that some Kubernetes features do not current work with Firecracker.

  • Resizing of CPU and Memory resource constraints
    Kata containers does not support resizing of Firecracker PODs.

Additionally as the support for Firecracker is preliminary, some features are yet to be implemented in the runtime. These include

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commented Jan 23, 2019

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commented Jan 23, 2019

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commented Jan 23, 2019

@mcastelino mcastelino changed the title documentation: firecracker limitations Documentation: Firecracker limitations Jan 23, 2019

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commented May 14, 2019

Just a note - when we do finally write the kata/fc docs into a markdown, can we also list the pre-requisites along with the limitations?
I've added a couple to the wiki page as a start:

  • must have vhost_vsock
  • must have block based storage backend

Please add more here, and to the wiki page, if you know of them.

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