Pod restarts not showing up in details

[abuehrle]

When I run kubectl get pods --all-namespaces in the terminal on the master host in Scope, I see a number of container in the sockshop have restarted:

But this information is not displayed on the container and says 0:

[rade]

surely the fact that it says 0 is a bug. -> changing labels.

[rade]

When pods restart, do their containers get re-created or re-started?

[2opremio]

Good question. I would say they are restarted. I think that the restart count is obtained from docker and I would doubt we have a bug specifically for the kubernetes case.

[rade]

Hmmm.

$ docker version
Client:
 Version:      17.03.1-ce
 API version:  1.27
 Go version:   go1.7.5
 Git commit:   c6d412e
 Built:        Mon Mar 27 17:14:09 2017
 OS/Arch:      linux/amd64

Server:
 Version:      17.03.1-ce
 API version:  1.27 (minimum version 1.12)
 Go version:   go1.7.5
 Git commit:   c6d412e
 Built:        Mon Mar 27 17:14:09 2017
 OS/Arch:      linux/amd64
 Experimental: false
$ docker run --name test -dti alpine /bin/sh
b70426355549d77aeb632ae38982e06328324a228a56ca5c7835684e2d0efc65
$ docker inspect -f '{{.RestartCount}} {{.State.StartedAt}}' test
0 2017-05-18T14:07:31.877338973Z
$ docker restart -t 0 test
test
$ docker inspect -f '{{.RestartCount}} {{.State.StartedAt}}' test
0 2017-05-18T14:07:40.494411989Z

This suggests to me that k8s is counting something different.

[abuehrle]

Docker doesn't seem to have a state 'restarted' but rather they have 'restarting' - in the act of restarting. And Kubernetes has a restart policy that determines if the container is restarted or not:

https://kubernetes.io/docs/concepts/workloads/pods/pod-lifecycle/

[2opremio]

I think there has been a mix-up here. The details pane shown by @abuehrle (with restart # = 0) corresponds to a container whereas the command-line output corresponds to a kubernetes pod. We don't currently show restart counts for pods in the UI (and as far as I have been able to see, we never had).

The restart counts of containers (based on how many times a specific container been restarted) are totally different to those of a container in a pod (based on the number of different dead containers that have not yet been removed).

To be even more precise, kubectl get pods shows the sum of the restart for all the containers of the pod (init containers make it a bit more complicated but let's not get into that).

So, this is really a new feature, which should be fairly easy to implement.