[zh] Update network-policies.md

Signed-off-by: xin.li <xin.li@daocloud.io>

content/zh/docs/concepts/services-networking/network-policies.md

@@ -121,42 +121,7 @@ An example NetworkPolicy might look like this:
 
 下面是一个 NetworkPolicy 的示例:
 
-```yaml
+{{< codenew file="service/networking/networkpolicy.yaml" >}}
-apiVersion: networking.k8s.io/v1
-kind: NetworkPolicy
-metadata:
-  name: test-network-policy
-  namespace: default
-spec:
-  podSelector:
-    matchLabels:
-      role: db
-  policyTypes:
-  - Ingress
-  - Egress
-  ingress:
-  - from:
-    - ipBlock:
-        cidr: 172.17.0.0/16
-        except:
-        - 172.17.1.0/24
-    - namespaceSelector:
-        matchLabels:
-          project: myproject
-    - podSelector:
-        matchLabels:
-          role: frontend
-    ports:
-    - protocol: TCP
-      port: 6379
-  egress:
-  - to:
-    - ipBlock:
-        cidr: 10.0.0.0/24
-    ports:
-    - protocol: TCP
-      port: 5978
-```
 
 <!--
 POSTing this to the API server for your cluster will have no effect unless your chosen networking solution supports network policy.

content/zh/examples/service/networking/networkpolicy.yaml

@@ -0,0 +1,35 @@
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: test-network-policy
+  namespace: default
+spec:
+  podSelector:
+    matchLabels:
+      role: db
+  policyTypes:
+    - Ingress
+    - Egress
+  ingress:
+    - from:
+        - ipBlock:
+            cidr: 172.17.0.0/16
+            except:
+              - 172.17.1.0/24
+        - namespaceSelector:
+            matchLabels:
+              project: myproject
+        - podSelector:
+            matchLabels:
+              role: frontend
+      ports:
+        - protocol: TCP
+          port: 6379
+  egress:
+    - to:
+        - ipBlock:
+            cidr: 10.0.0.0/24
+      ports:
+        - protocol: TCP
+          port: 5978
+