examples: images add docker.io/ prefix

Starting in Kubernetes 1.34 (when using cri-o), the short form is no
longer supported. To ensure maximum compatibility, the referenced image
names have been adjusted in our examples.

Author: mweibel

examples/dns-dual-protocol.yaml

@@ -51,7 +51,7 @@ spec:
     spec:
       containers:
         - name: coredns
-          image: coredns/coredns:1.11.1
+          image: docker.io/coredns/coredns:1.11.1
           args:
             - -conf
             - /etc/coredns/Corefile

examples/external-traffic-policy-local.yml

@@ -41,7 +41,7 @@ spec:
     spec:
       containers:
       - name: hello
-        image: nginxdemos/hello:plain-text
+        image: docker.io/nginxdemos/hello:plain-text
 ---
 apiVersion: v1
 kind: Service

examples/ingress.yaml

@@ -1,4 +1,4 @@
-# Deploys two nginxdemos/hello:plain-text containers ("blue" and "red")
+# Deploys two docker.io/nginxdemos/hello:plain-text containers ("blue" and "red")
 # and creates ClusterIP services named "blue-svc" and "red-svc" for the
 # deployments. Additionally, an Ingress resource named "simple" is set
 # up to route requests for "/red" to "red-svc" service and
@@ -37,7 +37,7 @@ spec:
         app: blue
     spec:
       containers:
-        - image: nginxdemos/hello:plain-text
+        - image: docker.io/nginxdemos/hello:plain-text
           name: hello
 ---
 apiVersion: v1
@@ -71,7 +71,7 @@ spec:
         app: red
     spec:
       containers:
-        - image: nginxdemos/hello:plain-text
+        - image: docker.io/nginxdemos/hello:plain-text
           name: hello
           resources: { }
 ---

examples/nginx-hello.yml

@@ -1,4 +1,4 @@
-# Deploys the nginxdemos/hello:plain-text container and creates a
+# Deploys the docker.io/nginxdemos/hello:plain-text container and creates a
 # loadbalancer service for it:
 #
 #     export KUBECONFIG=path/to/kubeconfig
@@ -34,7 +34,7 @@ spec:
     spec:
       containers:
       - name: hello
-        image: nginxdemos/hello:plain-text
+        image: docker.io/nginxdemos/hello:plain-text
 ---
 apiVersion: v1
 kind: Service

examples/proxy-v2-protocol.yml

@@ -40,7 +40,7 @@ spec:
     spec:
       containers:
       - name: proxy-hello
-        image: nginxdemos/hello:plain-text
+        image: docker.io/nginxdemos/hello:plain-text
         volumeMounts:
           - name: nginx-config-volume
             mountPath: /etc/nginx/nginx.conf