ESXi 8.0 U3 Installation Guide

Complete guide for installing VMware ESXi 8.0 Update 3 on homelab hardware, including USB creation from macOS and special considerations for Intel NUCs.

Prerequisites

Hardware Requirements

MS-A2: 128GB RAM, 500GB boot drive minimum
Intel NUCs: 64GB RAM, 250GB boot drive, USB network adapter
USB Drive: 8GB minimum (16GB recommended), USB 3.0 preferred

Software Requirements

VMware ESXi 8.0 U3 ISO image
VMware ESXi 8.0 U3 Offline Bundle (for updates/drivers)
macOS for creating bootable media
PowerCLI (optional, for custom ISOs)

File Types and Usage

ESXi ISO Image

VMware-VMvisor-Installer-8.0U3-24022510.x86_64.iso

Purpose: Create bootable installation media
Use Case: Fresh ESXi installation
Size: ~500MB

ESXi Offline Bundle

VMware-ESXi-8.0U3-24022510-depot.zip

Purpose: Updates, patches, driver installation
Use Case: Upgrade existing ESXi, add VIBs, create custom ISOs
Size: ~600MB

Creating Bootable USB on macOS

Method 1: Using dd Command

Insert USB drive and identify disk
```
diskutil list
```
Look for your USB drive (typically /dev/disk2 or /dev/disk3)
Unmount the USB drive
```
diskutil unmountDisk /dev/disk2
```

Write ISO to USB

sudo dd if="/path/to/VMware-VMvisor-Installer-8.0U3-24022510.x86_64.iso" \
         of=/dev/rdisk2 bs=1m status=progress

Note: Use /dev/rdisk2 (raw disk) for faster writing

Eject USB drive
```
diskutil eject /dev/disk2
```

Method 2: Using Automated Script

Use the provided script:

./scripts/create-esxi-usb.sh

Method 3: Using Balena Etcher (GUI)

Install Balena Etcher
```
brew install --cask balenaetcher
```
Launch Etcher and:
- Select the ESXi ISO
- Select your USB drive
- Click Flash

ESXi Installation Process

Standard Installation (MS-A2)

Boot from USB
- Insert USB drive
- Power on and press F11 for boot menu
- Select USB drive
Installation Steps
- Welcome screen → Enter
- Accept EULA → F11
- Select target disk (500GB NVMe)
- Select keyboard layout
- Set root password
- Confirm installation → F11
Post-Installation
- Remove USB drive
- Reboot
- Configure management network

Intel NUC Special Considerations

Intel NUCs with USB network adapters require additional drivers.

Option 1: Community ISO

Download pre-built ISO with USB NIC drivers:

VMware Flings: ESXi on USB Network Adapters
Includes net-usb-nic-linux driver

Option 2: Create Custom ISO

# Requires PowerCLI on Windows
# See scripts/create-custom-esxi-iso.ps1

Option 3: Post-Installation Driver

# After ESXi installation
esxcli software vib install -d /path/to/net-usb-nic-linux.vib

Network Configuration

Management Network Setup

Access DCUI (Direct Console User Interface)
- Press F2 at ESXi console
- Login with root password
Configure Management Network
- Network Adapters → Select vmnic0
- VLAN → Set if required (e.g., VLAN 10)
- IPv4 Configuration → Static
- Set IP address, subnet mask, gateway
- DNS Configuration → Set DNS servers
Test Management Network
- Ping gateway
- Ping DNS server
- Resolve hostname

VLAN Configuration for VCF

Configure these VLANs on your switch before installation:

VLAN ID	Purpose	Network	Description
10	Management	192.168.10.0/24	ESXi management, vCenter Server, and infrastructure management traffic
20	vMotion	192.168.20.0/24	Live migration of VMs between hosts, requires low latency and high bandwidth
30	vSAN	192.168.30.0/24	Storage traffic for vSAN cluster communication and data replication
40	NSX TEP	192.168.40.0/24	NSX Tunnel Endpoints for overlay network encapsulation (GENEVE/VXLAN)
50	NSX Edge Uplink	192.168.50.0/24	NSX Edge north-south connectivity to physical network/router
100	TKG Management	192.168.100.0/24	Tanzu Kubernetes Grid management cluster and control plane components
110	TKG Workload	192.168.110.0/24	Tanzu Kubernetes Grid workload clusters and application deployments
200	NUC Management	192.168.200.0/24	Optional - Alternative management for NUCs during testing/troubleshooting

Using the Offline Bundle

Update Existing ESXi

# First, find available datastores on the ESXi host
ssh root@esxi-host "esxcli storage filesystem list"

# Copy bundle to datastore (replace <datastore-name> with your actual datastore)
scp VMware-ESXi-8.0U3-*-depot.zip root@esxi-host:/vmfs/volumes/<datastore-name>/

# SSH to ESXi
ssh root@esxi-host

# Update ESXi (use the same datastore path as above)
esxcli software vib update -d /vmfs/volumes/<datastore-name>/VMware-ESXi-8.0U3-*-depot.zip

Install Additional VIBs

# List installed VIBs
esxcli software vib list

# Install new VIB
esxcli software vib install -d /path/to/driver.vib

# Install with dependencies
esxcli software vib install -d /path/to/bundle.zip

Create Custom ISO with Drivers

See scripts/create-custom-esxi-iso.ps1 for automated process.

Storage Configuration

MS-A2 Storage Layout

Slot 1: 500GB Samsung 980 Pro (Boot/ESXi)
Slot 2: 4TB Samsung 990 Pro (NVMe Tiering)
Slot 3: 4TB WD_BLACK SN850X (vSAN ESA)

Intel NUC Storage

Internal: 250GB NVMe (Boot/ESXi)
External: iSCSI to Synology DS918+

Troubleshooting

USB Drive Not Bootable

Verify USB created with raw disk (/dev/rdisk not /dev/disk)
Try different USB port
Check BIOS boot order

Network Adapter Not Found (Intel NUC)

Install USB NIC driver VIB
Use community ISO with drivers included
Verify USB adapter compatibility

Storage Not Detected

Check NVMe slot population
Verify BIOS storage settings
Update storage controller firmware

Backup Procedures

Backup ESXi Configuration

# Backup to file
vim-cmd hostsvc/firmware/backup_config

# Configuration saved to:
# /scratch/downloads/configBundle-hostname.tgz

Backup Installed VIBs

# Use provided script
./scripts/backup-esxi-vibs.sh

Security Hardening

Initial Security Steps

Change default passwords
Configure firewall rules
Enable SSH only when needed
Configure NTP
Join vCenter for centralized management

Network Security

Use VLANs for traffic isolation
Configure allowed IP ranges
Enable lockdown mode after vCenter join

Next Steps

After ESXi installation:

Configure vCenter Server (see VCF deployment guide)
Set up distributed switches
Configure vSAN (MS-A2) or iSCSI (NUCs)
Deploy VCF Management Domain