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rkt v0.3.0 Release Notes

  • 🚀 This is largely a momentum release but it does introduce a few new user-facing 🔋 features and some important changes under the hood which will be of interest to developers and distributors.

    First, the CLI has a couple of new commands:

    • rkt trust can be used to easily add keys to the public keystore for ACI signatures (introduced in the previous release). This supports retrieving public keys directly from a URL or using discovery to locate public keys - a simple example of the latter is rkt trust --prefix coreos.com/etcd. See the commit for other examples.
    • rkt list is an extremely simple tool to list the containers on the system

    🏗 As mentioned, v0.3.0 includes two significant changes to the Rocket build process:

    • 0️⃣ Instead of embedding the (default) stage1 using go-bindata, Rocket now consumes a stage1 in the form of an actual ACI, containing a rootfs and stage1 init/exec binaries. By default, Rocket will look for a stage1.aci in the same directory as the location of the binary itself, but the stage1 can be explicitly specified with the new -stage1-image flag (which deprecates -stage1-init and -stage1-rootfs). This makes it much more straightforward to use alternative stage1 images with rkt and facilitates packing it for different distributions like Fedora.
    • Rocket now vendors a copy of the appc/spec instead of depending on HEAD. This means that Rocket can be built in a self-contained and reproducible way and that master will no longer break in response to changes to the spec. It also makes explicit the specific version of the spec against which a particular release of Rocket is compiled.

    As a consequence of these two changes, it is now possible to use the standard 🏗 Go workflow to build the Rocket CLI (e.g. go get github.com/coreos/rocket/rkt 🏗 will build rkt). Note however that this does not implicitly build a stage1, so 🏗 that will still need to be done using the included ./build script, or some other way for those desiring to use a different stage1.