Implement ImageStats API

[resouer]

For now, ImageStats is not implemented. Should fix it.

Caller in kubelet:

https://github.com/kubernetes/kubernetes/blob/master/pkg/kubelet/kuberuntime/kuberuntime_image.go#L133

[huanwei]

I will take a look!

[kincl]

Running kube 1.9 and running into these errors that seem to be related:

E0430 09:31:05.013491   93659 remote_image.go:146] ImageFsInfo from image service failed: rpc error: code = Unavailable desc = grpc: the connection is unavailable
E0430 09:31:05.013525   93659 handler.go:276] HTTP InternalServerError serving /stats/summary: Internal Error: failed to get imageFs stats: rpc error: code = Unavailable desc = grpc: the connection is unavailable
I0430 09:31:19.910221   93659 kuberuntime_manager.go:514] Container {Name:test-3 Image:busybox:latest Command:[/bin/sh] Args:[] WorkingDir: Ports:[] EnvFrom:[] Env:[] Resources:{Limits:map[] Requests:map[]} VolumeMounts:[{Name:default-token-0n55z ReadOnly:true MountPath:/var/run/secrets/kubernetes.io/serviceaccount SubPath: MountPropagation:<nil>}] VolumeDevices:[] LivenessProbe:nil ReadinessProbe:nil Lifecycle:nil TerminationMessagePath:/dev/termination-log TerminationMessagePolicy:File ImagePullPolicy:IfNotPresent SecurityContext:nil Stdin:false StdinOnce:false TTY:false} is dead, but RestartPolicy says that we should restart it.
E0430 09:31:19.910374   93659 remote_image.go:83] ImageStatus "busybox:latest" from image service failed: rpc error: code = Unavailable desc = grpc: the connection is unavailable
E0430 09:31:19.910440   93659 kuberuntime_image.go:86] ImageStatus for image {"busybox:latest"} failed: rpc error: code = Unavailable desc = grpc: the connection is unavailable
E0430 09:31:19.910495   93659 kuberuntime_manager.go:734] container start failed: ImageInspectError: Failed to inspect image "busybox:latest": rpc error: code = Unavailable desc = grpc: the connection is unavailable
E0430 09:31:19.910530   93659 pod_workers.go:186] Error syncing pod 188526d0-4c7a-11e8-8a6a-0050569b14aa ("test-3_default(188526d0-4c7a-11e8-8a6a-0050569b14aa)"), skipping: failed to "StartContainer" for "test-3" with ImageInspectError: "Failed to inspect image \"busybox:latest\": rpc error: code = Unavailable desc = grpc: the connection is unavailable"

It appears that the container will not start if the kubelet cannot get image stats.

[kincl]

I solved my problem by setting --image-service-endpoint=unix:///var/run/frakti.sock in addition to --container-runtime-endpoint in the kubelet. This way frakti returns a Not Implemented error and the kublet allows the pod to be created.

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