docs(example): example for creating, updating, and rolling back a deployment (#302)

Closes #204

Author: tkporter

README.md

@@ -146,6 +146,8 @@ specifications:
 * Generate [badges](https://github.com/badges/shields) showing the
   status of your Deployments. Illustrates using the in-cluster config:
   [kubernetes-badges](https://github.com/silasbw/kubernetes-badges)
+* Create a deployment, patch a change, and rollback to the original version:
+  [deployment-create-patch-rollback.js](./examples/deployment-create-patch-rollback.js)
 
 ## Contributing
 

examples/deployment-create-patch-rollback.js

@@ -0,0 +1,50 @@
+/* eslint no-console:0 */
+//
+// Create a deployment, patch it, and roll back to the original.
+//
+const Client = require('kubernetes-client').Client;
+const config = require('kubernetes-client').config;
+
+const deploymentManifest = require('./nginx-deployment.json');
+
+async function main() {
+  try {
+    const client = new Client({ config: config.fromKubeconfig(), version: '1.10' });
+
+    // Create a deployment
+    const create = await client.apis.apps.v1.ns('default').deploy.post({ body: deploymentManifest });
+    console.log('Create: ', create);
+
+    // Update the deployment
+    // Change the image from nginx:1.7.9 to nginx:1.9.1
+    const updateImage = await client.apis.apps.v1.ns('default').deploy('nginx-deployment').patch({
+      body: {
+        spec: {
+          template: {
+            spec: {
+              containers: [{
+                name: 'nginx',
+                image: 'nginx:1.9.1'
+              }]
+            }
+          }
+        }
+      }
+    });
+    console.log('Update: ', updateImage);
+
+    // Rollback to nginx:1.7.9
+    const rollback = await client.apis.apps.v1beta1.namespaces('default').deployments('nginx-deployment').rollback.post({
+      body: {
+        kind: 'DeploymentRollback',
+        apiVersion: 'apps/v1beta1',
+        name: 'nginx-deployment'
+      }
+    });
+    console.log('Rollback: ', rollback);
+  } catch (err) {
+    console.error('Error: ', err);
+  }
+}
+
+main();