BlueGreenDemo.md

APIM Blue/Green Demo

• On the Jumphost, open Postman app from the desktop and then expand 4_NGINX Controller Dev API collection.

• Within this collection open Create_Dev_F1_V1_Component request and add weight field to each uris within the request body payload as shown in below screenshot. Click on Send to run the request.
  

  • NOTE: In case the above request provides a 401 Unauthorized response as below then you need to run the Login Admin request first to generate an authentication token for subsequent calls.
    

• If the Create_Dev_F1_V1_Component request succeeds then you should receive a 202 Accepted response code as shown in below screenshot.
  

• On the Jumphost, open Visual Studio Code app and then connect to Terminal 10.1.1.7 using SSH client.

• Run the following commands to generate load

  for i in {1..500}; do curl  http://devsports.example.com/api/f1/drivers; done

  for i in {1..500}; do curl  http://devsports.example.com/api/f1/seasons; done

• Navigate to Services view within Controller by clicking on the top right NGINX button.
  

• Select Apps from left pane and then click on Dev Sports Results app.
  

• Within the Dev Sports Results app page, click on Go to Analytics button.
  

• Inside the Analytics window, set the time window to Last 15 minutes and set Breakout By: to HTTP Upstream Addr.
  

• Refresh your browser to display the graphs:

  • Specifically look at the HTTP Requests graph.
  • You should see a graph that represents an upstream load ratio between the two nodes as follows:
    

• Now we would swap the weights of our backend servers. To do so, go back to Postman app and then open up the 4_NGINX Controller Dev API collection.

• Within this collection open Create_Dev_F1_V1_Component request and swap the values in the weight field within the request body payload as shown in below screenshot. Click on Send to run the request.
  

• Run the following commands to generate load within the terminal of Visual Studio Code.

  for i in {1..500}; do curl  http://devsports.example.com/api/f1/drivers; done

  for i in {1..500}; do curl  http://devsports.example.com/api/f1/seasons; done

• Navigate back to Services view within Controller by clicking on the top right NGINX button.
  

• Select Apps from left pane and then click on Dev Sports Results app.
  

• Within the Dev Sports Results app page, click on Go to Analytics button.
  

• Inside the Analytics window, set the time window to Last 15 minutes and set Breakout By: to HTTP Upstream Addr.
  

• Refresh your browser to display the graphs:

  • Specifically look at the HTTP Requests graph.

  • You should see a graph that represents the inverse of the load ratio that you saw with the last payload configuration, or an X pattern, thereby representing a Blue/Green scenario to the upstreams.
    

  • Below screenshot depicts the formation of an X pattern.