VMware ESXi Complete Guide: Installation, Management & Best Practices (2026)

VMware ESXi is the world's leading enterprise hypervisor, powering over 80% of virtualized data centers globally. As the core component of VMware vSphere, ESXi provides a robust, high-performance platform for running production workloads. This guide covers everything from installation to advanced administration.

Table of Contents

• VMware ESXi Overview
• ESXi Architecture
• Installation Guide
• VM Management
• Virtual Networking
• Storage Management
• vCenter Server
• Advanced Features
• Best Practices

VMware ESXi Overview

VMware ESXi (Elastic Sky X Integrated) is a Type 1 bare-metal hypervisor that installs directly on server hardware. Unlike Type 2 hypervisors that run on a host OS, ESXi replaces the operating system entirely, providing direct access to hardware resources.

Key Specifications (vSphere 8.0)

ESXi Architecture

ESXi uses a minimalist architecture with a ~150MB footprint:

• VMkernel — The core operating system and hypervisor, managing CPU scheduling, memory management, and I/O
• DCUI (Direct Console User Interface) — Basic text-mode configuration at the physical console
• hostd — Management agent handling API requests from vCenter and vSphere Client
• vpxa — vCenter agent for centralized management
• VMware Tools — Guest agents installed in each VM for enhanced performance and management

Installation Guide

ESXi installation requirements:

• 64-bit CPU with VT-x/AMD-V support
• Minimum 8 GB RAM (32+ GB recommended for production)
• Boot device: 32 GB minimum (USB, SD, SAN, or local disk)
• At least one supported network adapter
• Server on the VMware HCL (Hardware Compatibility List)

# Boot from ESXi installer ISO
# Select installation disk
# Set root password
# After installation, access via:
https://<esxi-ip-address>/ui    # Host Client (web UI)
ssh root@<esxi-ip-address>      # SSH access (enable first)

VM Management

Creating VMs

# List all VMs
vim-cmd vmsvc/getallvms

# Power operations
vim-cmd vmsvc/power.on <vmid>
vim-cmd vmsvc/power.off <vmid>
vim-cmd vmsvc/power.shutdown <vmid>    # Graceful (needs VMware Tools)
vim-cmd vmsvc/power.reboot <vmid>

# Get VM information
vim-cmd vmsvc/get.summary <vmid>
vim-cmd vmsvc/power.getstate <vmid>

# Snapshots
vim-cmd vmsvc/snapshot.create <vmid> "Before Update" "Pre-patch snapshot"
vim-cmd vmsvc/snapshot.get <vmid>
vim-cmd vmsvc/snapshot.revert <vmid>
vim-cmd vmsvc/snapshot.removeall <vmid>

VM Registration

# Register existing VM
vim-cmd solo/registervm /vmfs/volumes/datastore1/myvm/myvm.vmx

# Unregister VM (keeps files)
vim-cmd vmsvc/unregister <vmid>

Virtual Networking

ESXi supports two types of virtual switches:

• Standard vSwitch (vSS) — Per-host virtual switch, configured individually on each ESXi host
• Distributed vSwitch (vDS) — Cluster-wide virtual switch managed by vCenter (Enterprise Plus license)

# Network management
esxcli network nic list                           # List physical NICs
esxcli network vswitch standard list              # List vSwitches
esxcli network vswitch standard add --vswitch-name=vSwitch1
esxcli network vswitch standard portgroup list     # List port groups
esxcli network ip interface list                   # VMkernel interfaces
esxcli network ip dns server list                  # DNS servers
esxcli network ip route ipv4 list                  # Routing table
esxcli network firewall get                        # Firewall status
esxcli network firewall ruleset list               # Firewall rules

Storage Management

# Storage
esxcli storage filesystem list              # List datastores
esxcli storage core device list             # List storage devices
esxcli storage nmp device list              # Multipath info

# Virtual disk operations
vmkfstools -c 50G /vmfs/volumes/ds1/disk.vmdk                    # Create 50GB disk
vmkfstools -i source.vmdk dest.vmdk -d thin                      # Clone as thin
vmkfstools -X 100G /vmfs/volumes/ds1/disk.vmdk                   # Extend to 100GB
vmkfstools -k /vmfs/volumes/ds1/disk.vmdk dest.vmdk              # Convert thin to thick

vCenter Server

vCenter Server is the centralized management platform for vSphere environments. It provides:

• vMotion — Live migration of running VMs between hosts with zero downtime
• Storage vMotion — Live migration of VM storage between datastores
• DRS (Distributed Resource Scheduler) — Automatic VM placement and load balancing
• HA (High Availability) — Automatic VM restart on healthy hosts after a failure
• FT (Fault Tolerance) — Real-time VM mirroring for zero-downtime failover
• Content Library — Centralized repository for VM templates and ISOs

Advanced Features

Host Maintenance

# System management
esxcli system version get                    # ESXi version
esxcli system hostname get                   # Hostname info
esxcli hardware cpu list                     # CPU details
esxcli hardware memory get                   # Memory info

# Maintenance mode
esxcli system maintenanceMode set --enable true    # Enter maintenance
esxcli system maintenanceMode set --enable false   # Exit maintenance

# Patching
esxcli software vib list                     # List installed VIBs
esxcli software vib install -d /path/patch.zip     # Install patch
esxcli software profile get                  # Current image profile

Best Practices

1. Always install VMware Tools — Significantly improves VM performance and enables graceful shutdown
2. Use thin provisioning for non-critical workloads to save storage
3. Implement vSphere HA — Protects against host failures
4. Regular snapshots before patching — But don't keep snapshots long-term (performance impact)
5. Monitor with vCenter alarms — Set up alerts for CPU, memory, storage thresholds
6. Keep ESXi patched — Use VMware Update Manager for automated patching
7. Separate management network — Use a dedicated VLAN for ESXi management traffic
8. Enable lockdown mode — Restrict direct host access when managed by vCenter

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