advance load balancer – Curious-Techies

April 24, 2024

AVI (NSX-ALB) Quick tip for troubleshooting network connectivity!

A short conversation on how to check and troubleshoot network connectivity from AVI Service Engines.

CuriousTechie: Hello IT Guy, I am new to AVI and sometimes I get stuck in troubleshooting connectivity issues on service engines. Is there a way to check connectivity of the data nics from the service engines?

ITGuy: Sure there is a simple way! You may login to the network namespace of the data nic inside the service engine and check the connectivity.

CuriousTechie: Can you please show me how to do that? Here is my scenario!

I have NSX-T cloud with service engines running, I have created a virtual service but the Virtual Service is DOWN and the Pool is DOWN as well. Also I am not able to reach the SE data nics.

October 15, 2023

NSX-ALB GSLB Public or Private IP??

A conversation about how to configure GSLB service to provide the appropriate Public or Private IP as per the incoming DNS request.

CuriousTechie: Hello IT Guy, I am in a planning phase for a GSLB implementation and have some doubts around the DNS services, can you help me with it.

ITGuy: Sure! I recently had a conversation around GSLB which you can find here.

CuriousTechie: Yes! I have a fair understanding of GSLB, but I am looking for some specifics around how the GSLB DNS service determines which IP (Public or Private) it provides in the DNS response for Internal and External users. Can you help me to get some clarity and show the actual configuration?

June 28, 2023

NSX ALB Virtual Service Placement

A conversation about placement of Virtual Services on NSX ALB Service Engines

CuriousTechie: Hey IT Guy, I am starting my starting my journey with NSX ALB and I am little confused with different knobs in the Service Engine Group setting to manage the Virtual Service Placement. Can you show me around the setting to build a better understanding?

ITGuy: Yes, sure! Let’s start with some basic understanding of the knobs and then we can work on few scenarios to see how the placement works.

May 15, 2023May 15, 2023

Changing Service Engine Network in NSX ALB

CuriousTechie: Hey ITGuy ! I have a scenario with NSX ALB that I need to work on, can we talk about it?

ITGuy: Sure! Let’s understand the scenario and we can evaluate a feasible solution.

CuriousTechie: I have few Active Virtual Services running in my AVI environment on vCenter Write Access cloud. Frontend VIP and Backend Servers are on different networks and the deployment is on Two Arm mode.

Due to some backend configuration on vCenter, I had to create new DV PortGroups for the same VLAN communication and now I need to make sure that my AVI Services Engines gets connected to the new PortGroups that I have created and not on the old ones.

ITGuy: For normal VM’s running in the environment, this move is as easy as changing the network adapter of a VM but for Service Engines that is not the case. If you change the Network adapter of the SE from vCenter then it would result in mismatch of configuration between AVI and vCenter. For example, in vCenter you will see SE connected to New PortGroup but in AVI console you will see the SE connected to Old PortGroup.(Do not try that!)

The way to perform the activity is by using proper placement networks and during this activity your Virtual Service will not be available for some time thus it will be best done during maintenance window. Let’s see how it can be done!