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@gkatakate gkatakate released this 16 Aug 06:52
· 3 commits to main since this release
v0.2.0
3f3d5ba

[0.2.0] — 2026-08-16

Second release. Bigger guests boot, container writes land on a real disk
instead of guest RAM, a restored guest knows what time it is, and an idle
vCPU costs ~1% of a core rather than 100%.

Added

  • Writable storage on a host disk (k7d.katakate.org/scratch-size). A
    container's overlay upper now lives on a sparse ext4 image attached as a
    read-write virtio-blk device (default 8 GiB) instead of a RAM-backed
    layer. Writable capacity is no longer tied to the pod's memory limit, and
    filling it gives the writer ENOSPC instead of guest-wide memory
    pressure. A warm fork gets a reflink-CoW copy, isolated from parent and
    siblings; the image is unlinked with the VM.
  • Per-container ephemeral-storage limits
    (k7d.katakate.org/container-scratch-size).     A name=size list over
    Kubernetes container names, e.g. builder=2Gi,logger=64Mi, gives each
    named container its own image so an overrun stays that container's
    problem. Opt-in: each image spends one of the VM's virtio-MMIO device
    slots, and a pod using it is served by fork rather than the warm pool.
  • Guest ephemeral-storage usage accounting over the agent protocol.
  • packaging/install.sh for installing the daemon, shim, and guest
    artifacts from a release tarball.

Fixed

  • Guests of 4 GiB and larger now boot. Guest RAM is split across the
    32-bit MMIO hole instead of overlapping the device window.
  • A restored guest knows the wall clock. The guest is given kvmclock and
    the host a way to re-base it, so a VM resumed from a snapshot hours later
    no longer reports a date from 1999 — which broke TLS certificate
    validation for anything the guest fetched.
  • An idle vCPU no longer costs a full host core. The guest uses the
    haltpoll cpuidle governor with a 200 µs window, bringing an idle vCPU to
    roughly 1% of a core.
  • The daemon alone chooses which guest kernel and initramfs a VM boots, and
    refuses to create a VM without them rather than guessing.
  • OCI cgroup mounts are translated to guest cgroup2 with Kata-like
    namespace nesting, and guest IPv6 is enabled.
  • Pause/resume, fork-source adoption, teardown, and stats fixes found while
    integrating the k7 backend.

Install

tar xzf k7d-v0.2.0-x86_64-linux.tar.gz
cd k7d-v0.2.0-x86_64-linux
sudo ./install.sh
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