Error updating nginx image to 1.7.1

[dtlaycock]

In Core Concepts we create an nginx container and expose it:
kubectl run nginx --image=nginx --restart=Never --port=80

Then in the next step set the image to be nginx:1.7.1
kubectl set image pod/nginx nginx=nginx:1.7.1

After the pod restarts it fails with an exec error:

k describe

Events:
  Type     Reason     Age                    From               Message
  ----     ------     ----                   ----               -------
  Normal   Scheduled  3m46s                  default-scheduler  Successfully assigned default/nginx to minikube
  Normal   Pulled     2m22s (x5 over 3m46s)  kubelet            Container image "nginx:1.7.1" already present on machine
  Normal   Created    2m22s (x5 over 3m46s)  kubelet            Created container nginx
  Normal   Started    2m22s (x5 over 3m46s)  kubelet            Started container nginx
  Warning  BackOff    103s (x10 over 3m44s)  kubelet            Back-off restarting failed container nginx in pod nginx_default(b2cb0485-16e1-4125-a261-a4c74f8c5b99)

k logs nginx

exec /usr/local/sbin/nginx: exec format error

Creating a pod with that image and tag also fails with the same issue:
k run nginx --image=nginx:1.7.1

1.7.1 is about 8 years old at this point and only supports amd64 architectures.