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v0.21.0

firecracker-microvm/firecrackerv0.21.0Feb 19, 2020by alxiord

AI Summary

This release introduces support for booting from an initial RAM disk and improves stability, logging, and binary size, while removing deprecated configuration options.

Key Highlights

  • Added support for booting with an initial RAM disk image via `initrd_path`.
  • Added `--version` flag to both Firecracker and Jailer.
  • HTTP header parsing is now case insensitive.
  • Decreased release binary size by ~15%.
  • Changed default API socket path to `/run/firecracker.socket`.

Breaking Changes

  • Removed `--seccomp-level` jailer parameter.
  • Removed `memory.dirty_pages` metric.
  • Removed `options` field from logger configuration.
  • Changed default API socket path to `/run/firecracker.socket`.
  • Removed redundant RescanBlockDevice action from `/actions` API.

New Features

  • Support for booting with an initial RAM disk image.

Full Release Notes

### Added

- Support for booting with an initial RAM disk image. This image can be
  specified through the new `initrd_path` field of the `/boot-source` API
  request.

### Fixed

- Fixed #1469 - Broken GitHub location for Firecracker release binary.
- The jailer allows changing the default api socket path by using the extra
  arguments passed to firecracker.
- Fixed #1456 - Occasional KVM_EXIT_SHUTDOWN and bad syscall (14) during 
  VM shutdown.
- Updated the production host setup guide with steps for addressing
  CVE-2019-18960.
- The HTTP header parsing is now case insensitive.
- The `put_api_requests` and `patch_api_requests` metrics for net devices were
  un-swapped.

### Changed
  
- Removed redundant `--seccomp-level` jailer parameter since it can be
  simply forwarded to the Firecracker executable using "end of command
  options" convention.
- Removed `memory.dirty_pages` metric.
- Removed `options` field from the logger configuration.
- Decreased release binary size by ~15%.
- Changed default API socket path to `/run/firecracker.socket`. This path
  also applies when running with the jailer.
- Disabled KVM dirty page tracking by default.
- Removed redundant RescanBlockDevice action from the /actions API.
  The functionality is available through the PATCH /drives API.
  See `docs/api_requests/patch-block.md`.