Alternatives to Firecracker

Run isolated workloads inside lightweight Linux microVMs. The listings below can replace it for an important use case. Each note says what changes if you switch.

Replacements

Listings that take over the same core job as Firecracker.

  • QEMU

    The machine emulator and virtualiser that most of the Linux virtualisation stack is built on.

    FreeOpen sourceWindowsmacOSLinuxCommand line

    QEMU is a full machine emulator and virtualiser that also runs on Windows and macOS, and it can emulate other processor architectures, but its command line options are large and complex.

  • Cloud Hypervisor

    An open source virtual machine monitor written in Rust for running modern cloud workloads on KVM.

    FreeOpen sourceLinuxCommand line

    Cloud Hypervisor is a Rust VMM for cloud workloads on KVM that adds a REST API, live migration and device passthrough, with support from Kata Containers.

  • crosvm

    A hosted virtual machine monitor written in Rust that runs guest operating systems inside sandboxed virtual devices.

    FreeOpen sourceLinuxCommand line

    crosvm is a Rust VMM that sandboxes each virtual device and filters syscalls, used for Linux VMs on ChromeOS, and it is configured from the command line.

Also worth comparing

These listings name Firecracker as their own alternative, so the relationship runs both ways.

  • krunvm

    A command-line tool that creates lightweight microVMs from OCI container images using libkrun.

    FreeProprietarymacOSLinuxCommand line

    Firecracker runs lightweight Linux microVMs under the Apache-2.0 license, but runs only on Linux hosts and needs low-level configuration instead of building from OCI images.

Similar software

Related functionality, not a direct replacement.