Rocket 接连发布两个版本，0.4.0 和 0.4.1，其中 0.4.0 与 0.3.2 版本比较改进内容包括： Updated to v0.4.0 of the appc spec Introduced a database for indexing local images in the CAS (based on github.com/cznic/ql) Refactored container lifecycle to support a new "prepared" state, to pre-allocate a container UUID without immediately running the application Added support for passing arguments to apps through the rkt run CLI Implemented ACI rendering for dependencies Renamed rkt metadatasvc -> rkt metadata-service Added documentation around networking, container lifecycle, and rkt commands 而 0.4.1 则修复了 0.4.0 的如下 bug： Fix marshalling error when running containers with resource isolators Fixup help text on run/prepare about volumes Fixup permissions in rkt trust created files Introduce the rkt install subcommand Rocket 是 CoreOS 推出的类似 Docker 的应用容器。该项目目前还只是一个原型阶段。 Rocket 0.4.1 发布，Docker 容器替代品下载地址
