Monthly Archives: February 2024

TKG Cluster Deployment Gotchas with Node Health Check in CSE 4.2

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Recently, I upgraded Container Service Extension to 4.2.0 in my lab and was trying to deploy a TKG 2.4.0 cluster with node health check enabled. The deployment got stuck after deploying one control plane and worker node, and the cluster went into an error state.

Clicking on the Events tab showed the following error:

I checked the CSE log file and the capvcd logs on the ephemeral vm (before it got deleted) and found no error that would make sense to me.

I contacted CSE Engineering to discuss this issue and opened a bug for further analysis of the logs.

Root Cause

CSE Engineering debugged the logs and found that it was a bug in the product version. Here is the summary of the analysis done by Engineering. 

… Read More

How to Force Delete a Stale Virtual Service in NSX ALB

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Recently, I ran into an interesting problem in my lab where I couldn’t get rid of an unused Virtual Service in NSX ALB. The attempt to delete was failing with an error: “VS cannot be deleted! ‘It is being referred to by SystemConfiguration object”

I tried deleting the VS via API and it returned the same error

To figure out where this VS is being referenced, I looked through the pool members and other settings in NSX ALB, but I couldn’t discover anything particular. Internet searches were also not very helpful.

I then checked this issue in internal tools and got a hint that I needed to remove the VS reference from the system configuration through API first. … Read More

How to Force Delete a Stale Logical Segment in NSX 3.x

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I ran into a problem recently when disabling NSX in my lab where I couldn’t remove a logical segment. This logical segment was previously attached to NSX Edge virtual machines. The logical segments still had a stale port, even after the Edge virtual machines were deleted.

Any attempt to delete the segment through UI/API resulted in the error “Segment has 1 VMs or VIFs attached. Disconnect all VMs and VIFs before deleting a segment.” 

GUI Error

API Error

So how do I delete the stale segments in this case? The answer is through API, but before deleting the segments, you must delete the stale VIFs. 

Follow the procedure given below to delete stale VIFs.

1: List Logical Ports associated with the Stale Segment

This API call will list all segments. You can pass the segment uuid in the above command to list a specific segment (stale one).… Read More

How to Integrate TMC Self-Managed 1.0 with VCD

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Introduction

VMware Tanzu Mission Control is a centralized hub for simplified, multi-cloud, multi-cluster Kubernetes management. It helps platform teams take control of their Kubernetes clusters with visibility across environments by allowing users to group clusters and perform operations, such as applying policies, on these groupings.

VMware launched Tanzu Mission Control Self-Managed last year for customers running their Kubernetes (Tanzu) platform in an air-gapped environment. TMC Self-Managed is designed to support organizations that prefer to maintain complete control over their multi-cluster management hub for Kubernetes to take full advantage of advanced capabilities for cluster configuration, policy management, data protection, etc.

The first couple of releases of TMC Self-Managed only supported TKG clusters that were running on vSphere. Last month, VMware announced the release of the VMware Cloud Director Extension for Tanzu Mission Control, which allows installing TMC Self-Managed in a VCD environment to manage TKG clusters deployed through the VCD Container Service Extension (CSE).… Read More

Install Container Service Extension 4.2 in an Airgap Environment

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Introduction

VMware Container Service (CSE) is an extension of VMware Cloud Director that enables cloud providers to offer Kubernetes as a service to their tenants. CSE helps tenants quickly deploy the Tanzu Kubernetes Grid clusters in their virtual data centers with just a few clicks directly from the tenant portal. Tenants can manage their clusters utilizing Tanzu products and services, such as Tanzu Mission Control, in conjunction with the VMware Cloud Director Container Service Extension.

Until CSE 4.0, the deployment of TKG clusters depended on internet connectivity to get the necessary installation binaries from the VMware public image registry. There was no support for the airgap environment. 

With CSE 4.1, VMware introduced support for deploying CSE in an Airgap environment. Before diving into the nitty-gritty of configuring CSE, let’s look at the CSE airgap architecture.

CSE Airgap Architecture

The image below is from the CSE product documentation and depicts the high-level architecture and service provider workflow of CSE in an airgap setup.… Read More

VCD (10.5) Service Crashing Continuously in CSE Environment

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After updating my lab’s Container Service Extension to version 4.2.0, I observed that the VMware VCD service was frequently crashing. Restarting the cell service did not help much, as the VCD user interface (UI) died again after five minutes. The cell.log was throwing below exception

You will find similar log entries in the cell-runtime.log file.

… Read More

Quick Tip: Configure NSX Manager GUI Idle Timeout

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The NSX Manager Web-UI has a default timeout of 1800 seconds. i.e., the NSX Manager UI will time out after 30 minutes of inactivity. This timeout looks reasonable for a production deployment, but since security is not an issue in lab settings, you might want to change it to a little bit higher. On top of that, it is annoying to get kicked out of the UI after 30 minutes of idle session.

In this post, I will demonstrate how you can change the timeout value.

Run the command get service http to see the currently configured value:

Run the command set service http session-timeout 0 to fully remove the session timeout.… Read More