Kubernetes1.2引用第三方项目
1、go-dockerclient项目
go-dockerclient是一个GO语言写的docker客户端，支持Docker remote API，这个项目在https://github.com/fsouza/go-dockerclient中。
go-dockerclient使用两种方式同dockerdaemon通讯，第一种方式是通过/var/run/docker.sock，第二种方式是通过TLS。使用第一种方式时，需要有读写/var/run/docker.sock的权限，使用第二种方式时需要有认证文件。
在Kubenetes1.2中要求Docker Remote API版本至少是1.18。
go-dockerclient中使用到的Docker remote API和kubernetes1.2中使用到的Docker remote API：
| Docker Remote API 1.22 | 使用方式 | Go-dockerclient | Kubernetes1.2 |
| Get container stats based on resource usage | GET /containers/(id)/stats | ||
| Update a container | POST /containers/(id)/update | ||
| Rename a container | POST /containers/(id)/rename | ||
| Retrieving information about files and folders in a container | HEAD /containers/(id)/archive | ||
| List containers | GET /containers/json | √ | √ |
| Inspect a container | GET /containers/(id)/json | √ | √ |
| Inspect changes on a container’s filesystem | GET /containers/(id)/changes | √ | √ |
| Create a container | POST /containers/create | √ | √ |
| Start a container | POST /containers/(id)/start | √ | √ |
| Stop a container | POST /containers/(id)/stop | √ | √ |
| Restart a container | POST /containers/(id)/restart | √ | |
| Pause a container | POST /containers/(id)/pause | √ | |
| Unpause a container | POST /containers/(id)/unpause | √ | |
| List processes running inside a container | GET /containers/(id)/top | √ | |
| Kill a container | POST /containers/(id)/kill | √ | √ |
| Remove a container | DELETE /containers/(id) | √ | √ |
| Get an archive of a filesystem resource in a container | GET /containers/(id)/archive | √ | |
| Extract an archive of files or folders to a directory in a container | PUT /containers/(id)/archive | √ | |
| Copy files or folders from a container | POST /containers/(id)/copy，以后会被删除掉，使用archive代替 | √ | |
| Wait a container | POST /containers/(id)/wait | √ | |
| Create a new image from a container’s changes | POST /commit | √ | |
| Attach to a container | POST /containers/(id)/attach | √ | √ |
| Get container logs | GET /containers/(id)/logs | √ | √ |
| Resize a container TTY | POST /containers/(id)/resize | √ | |
| Export a container | GET /containers/(id)/export | √ | |
| List Images | GET /images/json | √ | √ |
| Inspect an image | GET /images/(name)/json | √ | √ |
| Get the history of an image | GET /images/(name)/history | √ | |
| Push an image on the registry | POST /images/(name)/push | √ | |
| Build image from a Dockerfile | POST /build | √ | |
| Create an image | POST /images/create | √ | √ |
| Load a tarball with a set of images and tags into docker | POST /images/load | √ | |
| Get a tarball containing all images in a repository | GET /images/(name)/get | √ | |
| Tag an image into a repository | POST /images/(name)/tag | √ | |
| Remove an image | DELETE /images/(name) | √ | √ |
| Search images | GET /images/search | √ | |
| Monitor Docker’s events | GET /events | ||
| Show the docker version information | GET /version | √ | √ |
| Display system-wide information | GET /info | √ | √ |
| Ping the docker server | GET /_ping | ||
| List volumes | GET /volumes | √ | |
| Create a volume | POST /volumes/create | √ | |
| Inspect a volume | GET /volumes/(name) | √ | |
| Remove a volume | DELETE /volumes/(name) | √ | |
| List networks | GET /networks | √ | |
| Inspect network | GET /networks/<network-id> | √ | |
| Create a network | POST /networks/create | √ | |
| Remove a network | DELETE /networks/(id) | √ | |
| Connect a container to a network | POST /networks/(id)/connect | √ | |
| Disconnect a container from a network | POST /networks/(id)/disconnect | √ | |
| Check auth configuration | POST /auth | √ | |
| Exec Create | POST /containers/(id)/exec | √ | √ |
| Exec Start | POST /exec/(id)/start | √ | √ |
| Exec Resize | POST /exec/(id)/resize | √ | |
| Exec Inspect | GET /exec/(id)/json | √ | √ |
下面是DockerDaemon版本同Docker Remote API版本对应关系：
| Docker Daemon版本 | Docker Remote API版本 |
| 1.10.x | 1.22 |
| 1.9.x | 1.21 |
| 1.8.x | 1.2 |
| 1.7.x | 1.19 |
| 1.6.x | 1.18 |
| 1.5.x | 1.17 |
| 1.4.x | 1.16 |
| 1.3.x | 1.15 |
| 1.2.x | 1.14 |
2、etcd项目
kubernetes1.2源代码中引用的etcd版本是2.2.5，这个版本的etcd集群中支持的最低版本是2.1.0。kubernetes1.2源代码中引用etcd的目的是使用etcd的client，所以对etcd server端版本的选择影响不大。
项目位置：https://github.com/coreos/etcd
3、cAdvisor项目
kubernetes1.2源代码中引用的cAdvisor版本是0.22.0，cAdvisor是用来采集容器资源使用和性能数据，在NODE节点上默认使用4194端口。
项目位置：https://github.com/google/cadvisor
4、Prometheus项目
kubernetes1.2源代码中引用的是Prometheus客户端源代码，用来定义kubernetes自身的监控项，比如etcd缓存命中数、etcd缓存入口访问数、从etcd查询数据总延迟、向etcd创建数据总延迟，等等，利用Prometheus客户端源代码还可以用来让使用者自定义POD中监控项，目前kubernetes1.2中只能以prometheus API的形式来自定义监控项，并且一个POD中最多只能自定义5个监控项，prometheus API是一个web services接口。
自定义POD中监控项写入文件/etc/custom-metrics/definition.json，然后在创建容器的时候挂载到容器中。
项目位置：https://github.com/prometheus/client_golang
5、Heapster项目
kubernetes1.2源代码中引用的是heapster客户端源代码，Heapster通过NODE节点上默认10255端口采集监控项信息，当kubernetes使用到HorizontalController的时候，会建立heapster客户端，由客户端来向heapster服务端发请求，收集历史监控数据。
项目位置：https://github.com/kubernetes/heapster