3V0-21.25 Install, Configure, Administrate the VMware Solution

Install, Configure, Administrate the VMware Solution Detailed Explanation

1. Installation

Installation covers the initial setup of ESXi and vCenter Server.
Designers don’t memorize step-by-step methods, but must understand:

• Different installation options

• Their pros/cons

• Which method fits which environment

1.1 ESXi Installation

ESXi is the hypervisor running on every server. Before you have a working cluster, you must install ESXi on each host.

Methods of installing ESXi

You can install ESXi using several approaches:

ISO installation

• You boot the server from an ISO file (usually mounted through remote console like iDRAC, iLO, or physical DVD/USB).

• Most common method for small or medium environments.

• Manual but simple.

PXE boot

• Server boots from the network (Preboot Execution Environment).

• Good for environments with standardized boot infrastructure.

Scripted install (Kickstart)

• Use answer files to automate the installation.

• Great for consistent builds at scale.

Auto Deploy

• ESXi runs stateless (no local installation).

• Hosts boot ESXi entirely from the network.

• Best for very large environments, where you want full automation.

• Preferred by enterprises with hundreds or thousands of hosts.

Boot options

ESXi can boot from several types of storage:

Local disk

• Traditional and reliable

• Often mirrored (RAID1) SSD/SAS drives

SAN boot

• Host boots ESXi from SAN LUN

• Good for diskless servers

• Requires careful network/storage configuration

SD/USB devices (legacy)

• Used heavily in the past, but:

• No longer recommended in vSphere 7+ because:

  • Too many writes

  • Device failure

• VMware strongly recommends alternative boot media now.

Stateless (Auto Deploy)

• No boot disk at all

• ESXi image streamed at boot

• Configuration stored in Host Profiles

• Extremely fast to scale large environments

Post-install tasks

After ESXi is installed, you must configure:

Management IP (on vmk0)

• Must have static IP address

• Used for connecting ESXi to vCenter

Hostname, DNS, NTP

Critical for stability:

• ESXi must have:

  • Correct DNS A & PTR records

  • Accurate time (NTP)

• Wrong DNS/TIME leads to:

  • HA failures

  • vCenter connection issues

  • Authentication problems

Join to vCenter

• You add the ESXi host to vCenter

• Once joined, you manage almost everything from vCenter

• Clustering, vMotion, HA, DRS become available

1.2 vCenter Server Appliance (VCSA) Deployment

vCenter Server is the central management server for your VMware environment.

vCenter topology

Embedded Platform Services Controller (PSC)

• In older versions, PSC could be external

• Today the embedded PSC is the standard

• Meaning everything (SSO + vCenter services) runs in one appliance

Design implication:

• Simple

• Easier failover and lifecycle management

• No more multi-PSC replication topologies needed

vCenter sizing

VCSA comes in sizes:

• Tiny

• Small

• Medium

• Large

• X-Large

Sizing is based on:

• Number of hosts

• Number of VMs

• Expected load

As a rule:

• Tiny → labs

• Small/Medium → common production clusters

• Large/X-Large → enterprise-scale

Designers must ensure that vCenter sizing matches current + future growth.

vCenter configuration

SSO domain

• Example: vsphere.local

• Houses identity information, permissions, tokens

Site name

• Important in multi-site or multi-vCenter designs

• Helps with topology awareness

Certificates

vCenter uses certificates to secure connections.

Options:

• Internal VMware CA

• External enterprise CA (for compliance)

Design considerations:

• If company has strict security policy, external CA may be required

• Certificate replacement must be tracked as part of operations

2. Configuration

Configuration refers to setting up ESXi hosts, clusters, storage, and networking so that they form a working vSphere environment.

2.1 Host Configuration

Each ESXi host needs consistent configuration. This is key for:

• HA

• DRS

• vMotion

• vSAN

• iSCSI/NFS

• Security

vSwitch or vDS configuration

You must configure virtual networking:

• vSS (Standard Switch) on each host

• vDS (Distributed Switch), centrally managed by vCenter

Design implication:

• For enterprise → use vDS for consistency and advanced features

• For small sites → vSS may be acceptable

VMkernel ports

VMkernel interfaces (vmk) are special ports used for host-level services:

• Management

• vMotion

• vSAN

• iSCSI/NFS

• Fault Tolerance logging

• Storage Replication traffic

Each function often needs:

• Correct VLAN

• Correct NIC teaming

• Proper MTU configuration

• Correct routing

Example design hint:

• vMotion and vSAN often use Jumbo Frames (MTU 9000)

• Management stays at MTU 1500

Storage configuration

You configure storage connectivity:

• Connect to SAN (FC, iSCSI)

• Connect to NAS (NFS)

• Discover LUNs

• Create & format VMFS datastores

• Mount NFS shares

• Configure vSAN if applicable

Design implication:
Storage type affects:

• HA

• Performance

• Fault domains

• DR strategy

• Capacity planning

2.2 Cluster Configuration

Clusters enable advanced features like HA and DRS.

Enable and configure vSphere HA

Design considerations:

• Admission control policy

• Heartbeat datastores

• Isolation response

• VM restart priority

• Failure tolerance (N+1, N+2)

Enable and configure vSphere DRS

DRS requires:

• vMotion network

• Shared storage

• Compatible CPUs (for cross-host migration)

Designers must choose:

• Automation level

• Migration threshold

• Rules (affinity/anti-affinity)

Enable and configure vSAN (if used)

Configuration includes:

• Disk groups

• Caching/capacity disks

• Storage policies

• Fault domains

Design implications:

• Network design → vSAN requires 10 GbE

• Storage planning → RAID 1 vs RAID 5/6

• Host count → minimum 3 hosts (2 hosts + witness for ROBO)

Host profiles

Host profiles enforce consistency, such as:

• Network settings

• Storage configuration

• Security settings

• NTP

• Firewall settings

Used heavily in:

• Large environments

• Auto Deploy environments

• Environments with strict compliance

In design scenarios:

If the environment requires consistent host configuration, Host Profiles are recommended.

3. Administration

Administration is what happens daily in a vSphere environment.

Architects must understand it because operational requirements influence design choices.

3.1 Daily Operations

VM lifecycle operations

• Deploy from template

  • Fast, consistent

  • Golden images reduce errors

• Clone VMs

  • Useful for new environments or quick duplication

• Snapshots

  • Temporary checkpoints

  • Useful for patching/testing

  • Must not be used long-term

  • Can grow large → performance risk

• Delete/retire VMs

  • Free up resources

  • Clean up datastore consumption

Design impact:

• VM lifecycle affects storage growth, naming standards, automation needs.

Host maintenance

• Enter maintenance mode

  • DRS migrates VMs away

  • Host can be patched safely

• Patching/upgrades via Lifecycle Manager (LCM)

  • Centralized

  • Ensures consistency

  • Supports firmware integration (vLCM)

Design implication:

• Clusters must have enough free capacity to allow hosts to enter maintenance mode.

• Usually factored with N+1 or N+2 policy.

3.2 Role-Based Access Control (RBAC)

Create custom roles

• Custom roles are common to meet security requirements

• Give minimal privileges needed for the user’s job

Examples:

• Backup Operator

• VM Operator

• Network Admin

• Storage Admin

Assign permissions at appropriate scope

Scopes include:

• vCenter root

• Datacenter

• Cluster

• Folder

• VM

Design implication:

• The more restrictive and specific the scope, the safer the access model

• Large organizations rely heavily on folder/role assignments

3.3 Monitoring & Alerting

vCenter alarms

• Built-in alarms monitor:

  • CPU usage

  • Memory usage

  • Disk latency

  • Host connectivity

  • HA/DRS events

  • vSAN health

You can also create custom alarms.

External monitoring tools

Examples:

• vRealize / Aria Operations

  • Capacity forecasting

  • Workload balancing

  • Anomaly detection

  • Heat maps

• Third-party systems

  • SNMP

  • Syslog

  • Security tools

Design implication:
Monitoring tools influence where you store logs, how you size vCenter, and how you manage compliance.

What to monitor

• Performance metrics

  • CPU Ready

  • Memory Ballooning

  • Disk latency

  • Network saturation

• Capacity trends

  • CPU/Memory growth

  • Storage utilization

  • Datastore fragmentation

• Configuration drift

  • Host or cluster settings that deviate from standards

  • Very important for compliance

Tools like Aria Operations help detect drift automatically.

Install, Configure, Administrate the VMware Solution (Additional Content)

1. vCenter High Availability (VCHA)

1.1 Architecture Components

VCHA protects the vCenter Server service by deploying three coordinated nodes:

• Active Node
  Runs all vCenter services and handles client connections.

• Passive Node
  Maintains a continuously synchronized copy of the Active node using synchronous replication and is ready to take over during failures.

• Witness Node
  Acts as a quorum member to prevent split-brain conditions and ensures failover decisions are valid.

1.2 Key Characteristics

• Uses synchronous state replication between Active and Passive nodes, ensuring no data loss.

• Failover occurs automatically and typically completes in a few minutes.

• Protects only the vCenter service; it does not protect ESXi hosts, virtual machines, or cluster services such as HA or DRS.

• Requires separate, dedicated networks:

  • Management network

  • VCHA replication network

1.3 Design Considerations

• Not intended for stretched clusters or environments with high network latency; synchronous replication requires low latency.

• Active and Passive nodes should not share the same datastore to avoid a single point of failure.

• VCHA is not a backup replacement; normal vCenter backups remain mandatory.

2. Enhanced Linked Mode (ELM)

2.1 Core Functionality

Enhanced Linked Mode enables multiple vCenter Servers to share:

• A single SSO domain

• Global permissions

• A unified global inventory view across vCenters

This allows administrators to navigate and manage multiple vCenters seamlessly.

2.2 Deployment Requirements

• All vCenter Servers must join the same SSO domain during deployment.

• Existing, separate SSO domains cannot be merged later.

• Versions of all vCenters participating in ELM must be compatible.

• Proper naming of the SSO domain (for example, vsphere.local) is important for long-term scalability.

2.3 Use Cases

• Multi-site deployments that require consistent administration.

• Large environments with multiple vCenters and distributed operational teams.

• Designs that require centralized view and unified RBAC across diverse infrastructure.

3. vSphere Lifecycle Manager (vLCM) – Image-Based Lifecycle

3.1 What vLCM Does

vLCM manages ESXi lifecycle using a cluster-level image that defines:

• ESXi version

• Vendor add-ons or OEM customizations

• Firmware and driver versions (when supported by vendor hardware integration)

All hosts in a cluster are maintained according to this defined image.

3.2 Benefits

• Ensures uniform configuration across all hosts in a cluster.

• Minimizes configuration drift and unplanned discrepancies.

• Simplifies combined firmware, driver, and ESXi updates through a single workflow.

3.3 Comparing Baseline Mode vs Image Mode

• Baseline Mode
  Patch-driven, flexible, but prone to inconsistencies and configuration drift.

• Image Mode (Recommended)
  Enforces a fixed, validated cluster image, providing predictability, consistency, and simplified lifecycle management.

4. Host Profiles – Limitations and Best Practices

4.1 What Host Profiles Cannot Configure Effectively

Host Profiles are powerful but have limitations. They do not handle well:

• Local user accounts, which are host-specific.

• Storage devices with unpredictable identifiers (such as NAA IDs that may differ across hosts).

• Network interface mappings that rely on specific physical NIC order or port positions.

4.2 Ideal Use Cases

Host Profiles are ideal for:

• Auto Deploy environments, where hosts are stateless and must be configured at boot.

• Large enterprise environments that require consistent host configuration.

• Compliance-driven environments where configuration drift must be minimized.

4.3 Best Practices

• Define a stable reference host with known-good configuration.

• Validate compliance regularly to find configuration drift.

• Avoid embedding host-specific identifiers such as MAC addresses or device IDs in profiles.

5. vCenter Backup and Restore

5.1 Backup Methods

The vCenter Server Appliance (VCSA) supports file-based backup through:

• FTP or FTPS

• HTTP or HTTPS

• SCP

A backup includes:

• vCenter configuration data

• Inventory

• Certificates

• SSO domain configuration

Virtual machine data is not part of this backup and must be handled by separate backup solutions.

5.2 Restore

• Restoring vCenter requires deploying a new appliance and applying the backup during the restore workflow.

• In VCHA environments, only the Active node should be backed up and restored.

• Restore does not recover virtual machine data; only the management plane is restored.

5.3 Design Considerations

• Backup frequency must match RPO requirements.

• Backup repositories must be durable, protected, and ideally offsite.

• Certificate retention and management must align with the restore process to avoid authentication issues.

6. Secure Boot, UEFI, and TPM for ESXi and vCenter

6.1 Secure Boot Requirements

• ESXi hosts must use UEFI firmware to support Secure Boot.

• ESXi boot components and installed VIBs must be digitally signed.

• Updates must maintain signature integrity or Secure Boot will block the component from loading.

6.2 TPM (Trusted Platform Module)

• TPM 2.0 devices store cryptographic measurements of host boot components.

• Enables Host Attestation in vCenter, confirming integrity at boot.

• Enhances compliance and provides tamper-resistant verification.

6.3 vCenter Considerations

• VCSA supports Secure Boot when underlying hardware and hypervisor support it.

• Secure Boot may affect patching, as unsigned extensions or drivers will not load.

7. ESXi Syslog, Log Forwarding, and Stateless Logging

7.1 ESXi Logging Behavior

• ESXi stores logs in RAM under /var/log, so logs are lost upon reboot unless redirected.

• Persistent logging requires configuration to forward logs or store them on shared storage.

7.2 Remote Syslog Configuration

ESXi hosts should forward logs to centralized log collectors such as:

• Aria Log Insight

• Standard syslog servers using UDP, TCP, or TLS

Centralized logging enhances troubleshooting and security analysis.

7.3 Stateless or Auto Deploy Considerations

• Stateless hosts lose all local logs on reboot; therefore, remote syslog is mandatory.

• Host Profiles should be used to apply consistent syslog settings across all hosts.

7.4 vCenter Logs

• vCenter logs are stored within VCSA and include multiple components such as vpxd, vmdird, and appliance management logs.

• Support bundles can be exported for advanced troubleshooting and vendor support.