By default it returns a shell:
tux@ultron:~/github/kubernetes/cluster/images/hyperkube> docker run -it k8s.gcr.io/debian-hyperkube-base-amd64:0.12.0
sh-4.4#
There are symlinks for: apiserver, kubectl, kubelet, proxy, scheduler
lrwxrwxrwx 1 root root 10 Oct 19 23:24 apiserver -> /hyperkube
drwxr-xr-x 1 root root 912 Oct 19 23:25 bin
drwxr-xr-x 1 root root 0 Jun 26 12:03 boot
lrwxrwxrwx 1 root root 10 Oct 19 23:24 cloud-controller-manager -> /hyperkube
lrwxrwxrwx 1 root root 10 Oct 19 23:24 controller-manager -> /hyperkube
drwxr-xr-x 5 root root 360 Nov 20 15:36 dev
drwxr-xr-x 1 root root 1810 Nov 20 15:36 etc
drwxr-xr-x 1 root root 0 Jun 26 12:03 home
lrwxrwxrwx 1 root root 10 Oct 19 23:24 kubectl -> /hyperkube
lrwxrwxrwx 1 root root 10 Oct 19 23:24 kubelet -> /hyperkube
drwxr-xr-x 1 root root 154 Oct 19 23:25 lib
drwxr-xr-x 1 root root 40 Oct 11 00:00 lib64
drwxr-xr-x 1 root root 0 Oct 11 00:00 media
drwxr-xr-x 1 root root 0 Oct 11 00:00 mnt
drwxr-xr-x 1 root root 6 Oct 19 23:25 opt
dr-xr-xr-x 434 root root 0 Nov 20 15:36 proc
lrwxrwxrwx 1 root root 10 Oct 19 23:24 proxy -> /hyperkube
drwx------ 1 root root 0 Oct 18 22:56 root
drwxr-xr-x 1 root root 26 Oct 19 23:25 run
drwxr-xr-x 1 root root 1820 Oct 19 23:25 sbin
lrwxrwxrwx 1 root root 10 Oct 19 23:24 scheduler -> /hyperkube
drwxr-xr-x 1 root root 0 Oct 11 00:00 srv
dr-xr-xr-x 13 root root 0 Nov 20 15:32 sys
drwxrwxrwt 1 root root 0 Oct 19 23:25 tmp
drwxr-xr-x 1 root root 70 Oct 11 00:00 usr
drwxr-xr-x 1 root root 90 Oct 11 00:00 var
The CMD is part is the following:
"Cmd": [
"/bin/sh",
"-c",
"#(nop) COPY file:31e4ddd5c221b63054724ec24849afee6e4dbc386a9cb7f5c8a778ce4a15d255 in /hyperkube "
],
The Dockerfile itself it plain simple:
FROM BASEIMAGE
# Copy the hyperkube binary
COPY hyperkube /hyperkube
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