Switch to k8s.gcr.io vanity domain

This is the 2nd attempt.  The previous was reverted while we figured out
the regional mirrors (oops).

New plan: k8s.gcr.io is a read-only facade that auto-detects your source
region (us, eu, or asia for now) and pulls from the closest.  To publish
an image, push k8s-staging.gcr.io and it will be synced to the regionals
automatically (similar to today).  For now the staging is an alias to
gcr.io/google_containers (the legacy URL).

When we move off of google-owned projects (working on it), then we just
do a one-time sync, and change the google-internal config, and nobody
outside should notice.

We can, in parallel, change the auto-sync into a manual sync - send a PR
to "promote" something from staging, and a bot activates it.  Nice and
visible, easy to keep track of.

cluster/addons/fluentd-elasticsearch/es-image/Makefile

@@ -14,7 +14,7 @@
 
 .PHONY:	binary build push
 
-PREFIX = gcr.io/google-containers
+PREFIX = staging-k8s.gcr.io
 IMAGE = elasticsearch
 TAG = v5.6.4
 

cluster/addons/fluentd-elasticsearch/es-statefulset.yaml

@@ -73,7 +73,7 @@ spec:
     spec:
       serviceAccountName: elasticsearch-logging
       containers:
-      - image: gcr.io/google-containers/elasticsearch:v5.6.4
+      - image: k8s.gcr.io/elasticsearch:v5.6.4
         name: elasticsearch-logging
         resources:
           # need more cpu upon initialization, therefore burstable class

cluster/addons/fluentd-elasticsearch/fluentd-es-ds.yaml

@@ -75,7 +75,7 @@ spec:
       serviceAccountName: fluentd-es
       containers:
       - name: fluentd-es
-        image: gcr.io/google-containers/fluentd-elasticsearch:v2.0.4
+        image: k8s.gcr.io/fluentd-elasticsearch:v2.0.4
         env:
         - name: FLUENTD_ARGS
           value: --no-supervisor -q

cluster/addons/fluentd-elasticsearch/fluentd-es-image/Makefile

@@ -14,7 +14,7 @@
 
 .PHONY:	build push
 
-PREFIX = gcr.io/google-containers
+PREFIX = staging-k8s.gcr.io
 IMAGE = fluentd-elasticsearch
 TAG = v2.0.4
 

cluster/addons/fluentd-elasticsearch/fluentd-es-image/README.md

@@ -4,11 +4,11 @@ that collects Docker container log files using [Fluentd][fluentd]
 and sends them to an instance of [Elasticsearch][elasticsearch].
 This image is designed to be used as part of the [Kubernetes][kubernetes]
 cluster bring up process. The image resides at GCR under the name
-[gcr.io/google-containers/fluentd-elasticsearch][image].
+[k8s.gcr.io/fluentd-elasticsearch][image].
 
 [fluentd]: http://www.fluentd.org/
 [elasticsearch]: https://www.elastic.co/products/elasticsearch
 [kubernetes]: https://kubernetes.io
-[image]: https://gcr.io/google-containers/fluentd-elasticsearch
+[image]: https://k8s.gcr.io/fluentd-elasticsearch
 
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