Rocket 0.8.1 发布，CoreOS 的容器引擎
欢迎加入运维网交流群:263444886Rocket 0.8.1 发布，更新内容如下：
该版本一些重大的 UX 变化：
[*] Arguments can now be passed through to CNI plugins on the command line - see the networking documentation for details
[*] The default metadata service port has been changed from 2375 (which had an unfortunate conflict with an IANA registered/reserved port) to anarbitrary non-registered port, 18112
[*] The APPNAME field in the output of rkt image list has been changed to the more accurate NAME
[*] rkt rm now supports a variable number of arguments, allowing the removal of multiple pods simultaneously
完整的更新列表:
[*] New features and UX changes:
[*] rkt rm is now variadic: it can now remove multiple pods in one command, by UUID
[*] The APPNAME column in rkt image list output has been changed to the more accurate NAME. This involves a schema change in rkt's on-disk datastore, but this should be upgraded transparently.
[*] Headers are now sent when following HTTP redirects while trying to retrieve an image
[*] The default metadata service port number was changed from a registered/reserved IANA port to an arbitrary port in the non-dynamic range
[*] Added the ability to override arguments for network plugins
[*] rkt will now error out if someone attempts to use --private-users with the lkvm backend
[*] Bug fixes:
[*] Fixed creation of /tmp in apps' root filesystems with correct permissions
[*] Fixed garbage collection after umounts (for example, if a system reboots before a pod is cleanly destroyed)
[*] Fixed a race in interactive mode when using the lkvm backend that could cause a deadlock or segfault
[*] Fixed bad parameter being passed to the metadata service ("uid" -> "uuid")
[*] Fixed setting of file permissions during stage1 set up
[*] Fixed a potential race condition during simultaneous iptables invocation
[*] Fixed ACI download progress being sent to stderr instead of stdout, now consistent with the output during retrieval of Docker images
[*] rkt help prepare will now show the correct default stage1 image
[*] rkt will refuse to add isolators with nil Limits, preventing a panic caused by an ambiguity in upstream appc schema
[*] Other changes:
[*] Reworked the SELinux implementation to use systemd-nspawn's native context-switching feature
[*] Added a workaround for a bug in Docker <1.8 when it is run on the same system as rkt (see #1210 (comment))
[*] Added a rkt-xxxx-tapN name to tap devices that rkt creates
[*] Functional tests now clean intermediate images between tests
[*] Countless improvements and cleanup to the build system
[*] Numerous documentation improvements, including splitting out all top-level rkt subcommands into their own documents
下载页面：v0.8.1
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。
CoreOS 把它的容器称为 App Containers，里面包含 app container image、runtime、container-discovery 协议等。其中，App Container Image 和 Docker 里的Image 比较类似，包含应用必需的元素组成，如源代码和二进制文件。Rocket runtime 则是依照 App Container 标准规格打造的，旨在将容器真正的变成一款命令行工具。
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