Rocket 0.8.1 发布，CoreOS 的容器引擎

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　　Rocket 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。