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Virtual Geek

Tales from real IT system administrators world and non-production environment

Blog posts October 2022

Using terraform to clone a virtual machine on VMware vSphere infrastructure

This is a example script to clone and deploy multiple Linux vCenter Virtual Machines on VMware vSphere vCenter server infrastructure using hashicorp terraform scripts. In my VMware infrastructure I already have configured virtual datacenter, cluster, network and datastore. There is Linux VM template…

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Setup HAProxy for Ingress Controller Kubernetes Cluster

In earlier article I configured Setup and deploy Ingress controller for Kubernetes on Bare Metal servers. To get the web url working in the browser I had used local hosts file to add DNS host entries under directory /etc, but everytime I try the dns url in the browser it was taking me to the fir…

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Configure, Manage and Assign License Settings for VMware vCenter Server and ESXi

After deploying new VMware vSphere 8.0 products, I was seeing MANAGE YOUR LICENSES (There are expired or expiring licenses in your inventory) warning on the vCenter vSphere Client ui portal top bar. This article focuses on assigning licenses to vCenter server or ESXi host.

Installation Articles

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Setup and deploy Ingress controller for Kubernetes on Bare Metal servers

After install, setup and configuration of Kubernetes Cluster in my bare metal servers, I wanted to do the POC (proof of concept) of Ingress resource for one of the production environment. 

Kubernetes Ingress is an API entity that lets entry to your Kubernetes services from outside network. It p…

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How to Install & Deploy vCenter Server Appliance (VCSA) 8.0

vCenter Server is the unified management service for VMware, and is used to handle virtual machines, multiple ESXi hosts, and all dependent elements from a single centralized location. As a base I have already deployed my ESXi server in the lab with VMware ESXi 8.0 step by step Installation guide w…

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Configure VMware ESXi server network settings in DCUI

In the earlier part of I wrote an article about VMware ESXi 8.0 step by step Installation guide with Screenshots. In this article I will configure the networking for ESXi server and assign IP address, DNS and other configuration.

After first part ESXi server is rebooted, I am on the DCUI screen,…

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ESXi Installation Hardware_Virtualization Warning Hardware virtualization is not a feature of CPU

While installing ESXi operating system on the server, I was receiving below warnings errors regarding CPU hardware Virtualization. 

Check out: VMware ESXi 8.0 step by step Installation guide with Screenshots

Error(s)/Warning(s) Found During System Scan

The system encountered the followi…

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VMware ESXi 8.0 step by step Installation guide with Screenshots

As VMware recently released and made available ESXi 8.0 publicly available, I thought get the hands dirty and install it in my Home Lab. I don't have licenses for ESXi 8.0, but it can be tested in Evaluation mode for 60 day trial. Which is enough to check new features of ESXi 8.0 server. I have down…

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Kubernetes kubeadm join could not find a jws signature in the cluster-info ConfigMap for token ID

While configuring Kubernetes cluster using kubeadm tool and joining Worker nodes into the cluster I receiving below error.

kubeadm join token discovery token ca cert hash preflight kubernetes cluster api server jws signature cluster-info configmap control-plane k8s master node worker node.jpg

Another error: Kubernetes kubeadm join couldn't validate the identity of the API server connection refused

Complete articles:
Configure Nginx Load Balancer for the …

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Kubernetes kubeadm join couldn't validate the identity of the API server connection refused

While configuring new worker node in Kubernetes cluster using kubeadm tool I was receiving below error. Basically I was trying to join worker node in the Kubernetes cluster control-plane using kubeadm join command, but it was failing because of multiple reasons.

Kuberenetes error kubeadm join error preflight error execution phase preflight couldn't validate the indentity of the api server connect connection refused init 6443 dial tcp.jpg

Complete articles series on i…

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Install and configure Kubernetes cluster worker nodes using kubeadm - Part 3

In this third part of configuration of Kubernetes cluster I have completed earlier part of a blog Install and configure Kubernetes cluster master nodes using kubeadm - Part 2. I have three Ubuntu server nodes installed in my lab for Worker nodes to add in Kubernetes cluster using kubeadm tool. Be…

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Install and configure Kubernetes cluster master nodes using kubeadm - Part 2

After preparing NGINX load balancer for Kubernetes API Server in Configure Nginx Load Balancer for the Kubernetes API Server - Part 1. It is time to use this LB in Kubernetes cluster. I will setup 3 master nodes in control-plane. Before deploying master nodes using kubeadm, I am preparing servers …

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Configure Nginx Load Balancer for the Kubernetes API Server - Part 1

Although I have written two articles for installation and configuration Kubernetes cluster, it was built with very basic configuration and tried to keep it simple. Here in this article I am configuring full fledged Kubernetes cluster requiring intermediate skills on linux.

Check my articles on …

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Azure add create a Subnet to existing Virtual Network using PowerShell

This is second part of the earlier written article Create a Azure Virtual Network with Subnet using PowerShell. Here in this blog I will create subnet in already created Azure vNET (Virtual Network). I have defined Azure vNET and subnets in Powershell variables. I am creating a Azure vNET without a…

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Remove Azure Virtual Network Subnet using PowerShell

This PowerShell script will help you to remove subnet from Microsoft Azure Virtual Network (vNET). You can follow my earlier articles regarding the another topic related to Azure networking here on Azure add create a Subnet to existing Virtual Network using PowerShell and  Create a Azure Virtual…

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