发布于 2016-02-05 00:54:06 | 144 次阅读 | 评论: 0 | 来源: 网友投递
Rocket CoreOS 的容器引擎
Rocket （也叫 rkt）是 CoreOS 推出的一款容器引擎，和 Docker 类似，帮助开发者打包应用和依赖包到可移植容器中，简化搭环境等部署工作。Rocket 和 Docker 不同的地方在于，Rocket 没有 Docker 那些为企业用户提供的“友好功能”，比如云服务加速工具、集群系统等。反过来说，Rocket 想做的，是一个更纯粹的业界标准。
Rocket (rkt) 发布 1.0 版本，这意味着从现在开始该引擎可用于生产环境。其命令行工具和磁盘格式等都认为是稳定的，可以再次开发。从该版本开始，任何接口方面的改动都会考虑向后的兼容性。
可以访问 landing page on the CoreOS site 来获取更多的信息。
完整的改进内容包括：
Add pod creation and start times to rkt list and rkt status (#2030). See rkt list and rkt status documentation.
The DNS configuration can now be passed to the pod via the command line (#2040). See DNS support documentation.
Errors are now structured, allowing for better control of the output (#1937). See Error & Output for how a developer should use it.
All output now uses the new log package in pkg/log to provide a more clean and consistent output format and more helpful debug output (#1937).
Added configuration for stage1 image. Users can drop a configuration file to /etc/rkt/stage1.d (or to stage1.d in the user configuration directory) to tell rkt to use a different stage1 image name, version and location instead of build-time defaults (#1977).
Replaced the --stage1-image flag with a new set of flags. --stage1-url, --stage-path, --stage1-name do the usual fetching from remote if the image does not exist in the store. --stage1-hash takes the stage1 image directly from the store. --stage1-from-dir works together with the default stage1 images directory and is described in the next point (#1977).
Added default stage1 images directory. User can use the newly added --stage1-from-dir parameter to avoid typing the full path. --stage1-from-dir behaves like --stage1-path (#1977).
Removed the deprecated --insecure-skip-verify flag (#2068).
Fetched keys are no longer automatically trusted by default, unless --trust-keys-from-https is used. Additionally, newly fetched keys have to be explicitly trusted with rkt trust if a previous key was trusted for the same image prefix (#2033).
Use NAT loopback to make ports forwarded in pods accessible from localhost (#1256).
Show a clearer error message when unprivileged users execute commands that require root privileges (#2081).
Add a rkt tmpfiles configuration file to make the creation of the rkt data directory on first boot easier (#2088).
Remove rkt install command. It was replaced with a setup-data-dir.sh script (#2101.
Fix regression when authenticating to v2 Docker registries (#2008).
Don't link to libacl, but dlopen it (#1963). This means that rkt will not crash if libacl is not present on the host, but it will just print a warning.
Only suppress diagnostic messages, not error messages in stage1 (#2111).
Trusted Platform Module logging (TPM) is now enabled by default (#1815). This ensures that rkt benefits from security features by default. See rkt's Build Configuration documentation.
Added long descriptions to all rkt commands (#2098).
The --stage1-image flag was removed. Scripts using it should be updated to use one of --stage1-url, --stage1-path, --stage1-name, --stage1-hash or --stage1-from-dir
All uses of the deprecated --insecure-skip-verify flag should be replaced with the --insecure-options flag which allows user to selectively disable security features.
The rkt install command was removed in favor of the dist/scripts/setup-data-dir.sh script.
With this release, rkt RPM/dpkg packages should have the following updates:
Pass --enable-tpm=no to configure script, if rkt should not use TPM.
Use the --with-default-stage1-images-directory configure flag, if the default is not acceptable and install the built stage1 images there.
Distributions using systemd: install the new file dist/init/systemd/tmpfiles.d/rkt.conf in /usr/lib/tmpfiles.d/rkt.conf and then run systemd-tmpfiles --create rkt.conf. This can replace running rkt install to set the correct ownership and permissions.