rkt v1.4.0 发布，CoreOS 的容器引擎
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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。
更新详情：
新特性和 UX changes
[*]config: add config subcommand (#2405). This new subcommand prints the current rkt configuration. It can be used to get i.e. authentication credentials. See rkt's config subcommanddocumentation.
[*]run: add --user/--group app flags to rkt run and rkt prepare allowing to override the user and group specified in the image manifest (#2419).
[*]gc: Add flag 'mark-only' to mark garbage pods without deleting them (#2400, #2402). This new flag moves exited/aborted pods to the exited-garbage/garbage directory but does not delete them. A third party application can use rkt gc --mark-only=true to mark exited pods as garbage without deleting them.
[*]kvm: Add support for app capabilities limitation (#2222). By default kvm flavor has got enabled every capability inside pod. This patch adds support for a restricted set of capabilities inside a kvm flavor of rkt.
[*]stage1/init: return exit code 1 on error (#2383). On error, stage1/init was returning a non-zero value between 1 and 7. This change makes it return status code 1 only.
[*]api: Add 'CreatedAt', 'StartedAt' in pod's info returned by api service. (#2377).
文档改进
[*]Minor documentation fixes (#2413, #2395, #2231).
[*]functional tests: Add new test with systemd-proxyd (#2257). Adds a new test and documentation how to use systemd-proxyd with rkt pods.
Bug 修复
[*]kvm: refactor volumes support (#2328). This allows users to share regular files as volumes in addition to directories.
[*]kvm: fix rkt status (#2415). Fixes a regression bug were rkt status was no longer reporting the pid of the pod when using the kvm flavor.
[*]Build actool for the build architecture (#2372). Fixes a cross compilation issue with acbuild.
[*]rkt: calculate real dataDir path (#2399). Fixes garbage collection when the data directory specified by --dir contains a symlink component.
[*]stage1/init: fix docker volume semantics (#2409). Fixes a bug in docker volume semantics when rkt runs with the option --pod-manifest. When a Docker image exposes a mount point that is not mounted by a host volume, Docker volume semantics expect the files in the directory to be available to the application. This was partially fixed in rkt 1.3.0 via #2315 but the bug remained when rkt runs with the option --pod-manifest. This is now fully fixed.
[*]rkt/image: check that discovery labels match manifest labels (#2311).
[*]store: fix multi process with multi goroutines race on db (#2391). This was a bug when multiple rkt fetch commands were executed concurrently.
[*]kvm: fix pid vs ppid usage (#2396). Fixes a bug in rkt enter in the kvm flavor causing an infinite loop.
[*]kvm: Fix connectivity issue in macvtap networks caused by macvlan NICs having incorrect names (#2181).
[*]tests: TestRktListCreatedStarted: fix timing issue causing the test to fail on slow machines (#2366).
[*]rkt/image: remove redundant quotes in an error message (#2379).
[*]prepare: Support 'ondisk' verification skip as documented by the global options (#2376). Prior to this commit, rkt prepare would check the ondisk image even if the --insecure-options=ondiskflag was provided. This corrects that.
其他更新
[*]tests: skip TestSocketProxyd when systemd-socket-proxyd is not installed (#2436).
[*]tests: TestDockerVolumeSemantics: more tests with symlinks (#2394).
[*]rkt: Improve build shell script used in continuous integration (#2394).
[*]protobuf: generate code using a script (#2382).
[*]Generate manpages (#2373). This adds support for generating rkt man pages using make manpages and the bash completion file using make bash-completion, see the note for packagers below.
[*]tests/aws.sh: add test for Fedora 24 (#2340).
Note for packagers
Files generated from sources are no longer checked-in the git repository. Instead, packagers should build them:
[*] Bash completion file, generated by make bash-completion
[*] Man pages, generated by make manpages
下载地址：
[*] rkt-v1.4.0.tar.gz
[*] rkt-v1.4.0.tar.gz.sig
[*] stage1-coreos-1.4.0-linux-amd64.aci
[*] stage1-coreos-1.4.0-linux-amd64.aci.asc
[*] stage1-fly-1.4.0-linux-amd64.aci
[*] stage1-fly-1.4.0-linux-amd64.aci.asc
[*] stage1-kvm-1.4.0-linux-amd64.aci
[*] stage1-kvm-1.4.0-linux-amd64.aci.asc
[*] Source code (zip)
[*] Source code (tar.gz)
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