6V0-22.25 Installing, Configuring, and Setup

Installing, Configuring, and Setup Detailed Explanation

1. Controller Deployment

In this section we look at how to deploy the central component—the Controller—for the VMware Avi Load Balancer (formerly Avi Networks) system. The Controller is the brains of the system and needs correct setup.

1.1 Platform Requirements

Before installing, you must meet the minimum infrastructure requirements for each Controller node.

• The Controller is deployed as a virtual appliance. Examples:

  • As an OVA file for VMware vSphere

  • QCOW2 image for KVM

  • AMI for AWS

• Minimum resource requirements per node:

  • CPU: 8 vCPUs

  • Memory (RAM): 24 GB

  • Disk space: 128 GB

• Networking requirements:

  • Each node should have a static IP address (not DHCP in production)

  • DNS resolution must be working (both forward and reverse)

  • Time synchronization (NTP) should be configured

Meeting these helps ensure stability, performance, and predictable behavior.

1.2 HA Controller Cluster

Since the Controller is critical, you need to deploy it with high availability (HA) so that failure of one node does not stop your entire system.

• Minimum of 3 nodes in the Controller cluster is recommended.

• All nodes must be able to communicate over the management network (they need visibility to each other).

• Configuration is replicated across nodes, so changes on one node apply to all.

• The cluster uses a leader election mechanism: one node acts as leader, others follow. If the leader fails, another is automatically elected.

This design ensures that no single point of failure can bring down the control plane.

1.3 Deployment Methods

You can deploy Controllers in several ways—choose the method that fits your environment:

• Manual deployment

  • Use vSphere UI or AWS console to import OVA / AMI

  • Configure settings manually (IP address, network, etc.)

• Automated deployment

  • Use tools like Terraform to define deployment as code

  • Use cloud‑init scripting for initial configuration (on supported platforms)

  • Use automation frameworks like vRealize Automation (vRA) for on‑demand provisioning

Automated methods help ensure consistency, speed, and reduce human error.

2. Initial Controller Setup

Once the Controller virtual machines are deployed and powered on, you'll perform the initial setup through the web UI.

2.1 First-Time Setup Wizard

When you access the Controller via a browser for the first time (using its static IP address), you'll be guided through a setup wizard.

What’s included in the wizard:

• DNS Configuration

  • Configure forward and reverse DNS.

  • Required for hostname resolution between Avi components and for certificate validation.

• NTP (Network Time Protocol)

  • Ensures time synchronization between Controller and SEs, critical for logs, certificates, and analytics.

  • Recommended to point to internal or public time servers.

• SMTP (Optional)

  • If you want to enable email alerts or notifications, enter SMTP server details here.

• Admin Credentials

  • You'll set the initial admin password during the setup wizard.

  • This user has full privileges.

• System Settings

  • Includes hostname, domain, and basic global settings.

  • Set telemetry options and licensing preferences.

• License Key Setup

  • Choose between:

    • Evaluation license (trial, time-limited)

    • Full license key (upload your purchased license)

  • The license defines feature availability and capacity (e.g., Gbps, cores).

2.2 Cloud Configuration

After the first-time setup, you'll configure the Cloud that tells Avi how to interact with your environment.

A Cloud in Avi is not just “public cloud” (like AWS), it means any infrastructure environment—on-prem or cloud—where Avi will deploy Service Engines.

Cloud Types and Setup:

1. vCenter Cloud

   • Used in private VMware vSphere environments

   • Required details:

     • vCenter IP or hostname

     • Admin credentials (read/write permissions)

     • Datacenter, cluster, and resource pool info

     • Management and data network mappings

2. AWS Cloud

   • For public cloud deployments on Amazon Web Services

   • Requires:

     • AWS Access Key and Secret Key

     • Target Region (e.g., us-west-2)

     • VPC, subnet(s), and security group(s)

   • Avi can auto-scale SEs using AWS APIs

3. No Access Cloud

   • Used when Avi does not have API access to infrastructure

   • SEs must be deployed manually

   • Common for highly restricted environments or air-gapped deployments

Each cloud configuration includes options for:

• Management IPs

• Network connectivity

• SE image customization

• High availability settings

Note: You can define multiple clouds in one Avi deployment, and assign tenants or applications to different clouds.

Summary: Initial Setup & Cloud Config

Step	Key Details
First-Time Setup Wizard	DNS, NTP, admin credentials, SMTP (optional), license key
Cloud Configuration	Choose between vCenter, AWS, or No Access based on your environment
Cloud Settings	Define infrastructure access, networking, and SE deployment options

3. Service Engine (SE) Deployment

Service Engines (SEs) are the data plane of Avi—they handle live traffic, including load balancing, SSL termination, content switching, and health monitoring. Proper deployment and configuration of SEs is essential for performance and high availability.

3.1 Deployment Methods

There are two primary ways to deploy SEs, depending on the Cloud Type you defined in the previous setup.

A. Auto-Deployment (Full Access Cloud)

• Applies to environments where Avi has API access, such as:

  • vCenter Cloud

  • AWS Cloud

• In this model, the Avi Controller automatically deploys SEs:

  • Instantiates SE VMs or instances

  • Connects them to the right networks

  • Assigns them to SE Groups

Benefits:

• Hands-free deployment

• Automatic scaling

• Easier lifecycle management

B. Manual Deployment (No Access Cloud)

• For restricted environments where the Avi Controller cannot access infrastructure APIs

• You must:

  • Download the correct SE image (OVA, AMI, QCOW2, etc.)

  • Manually deploy the SE in your platform (e.g., using vSphere or OpenStack)

  • Configure its network and power it on

• The SE will register with the Controller once it boots and reaches the management network.

Use Cases:

• Secure, air-gapped environments

• Manual control required due to regulatory or compliance reasons

Scaling SEs

• Manual Scaling: Add or remove SEs manually based on expected load.

• Auto Scaling: Avi can automatically add SEs to the group if:

  • CPU, memory, connection thresholds are exceeded

  • HA failure recovery is triggered

3.2 SE Group Configuration

A Service Engine Group (SE Group) is a logical grouping of SEs that defines how they behave. Each Virtual Service is assigned to an SE Group.

Key Parameters to Configure:

1. Size of SEs

   • Define how many vCPUs and how much memory each SE in the group should have

   • Example:

     • Small SE: 2 vCPUs, 4 GB RAM

     • Medium SE: 4 vCPUs, 8 GB RAM

2. Number of SEs

   • Minimum and maximum number of SEs in the group

   • Auto-scaling expands or contracts the number based on load

3. HA Mode

   • Choose one of the following:

     • Active/Standby: One SE handles traffic, the other is on standby

     • Active/Active: Multiple SEs process traffic concurrently

     • Elastic HA (N+M): Dynamic and scalable model with shared spares

4. Placement Rules

   • Define fault domain rules, such as:

     • Don’t place multiple SEs on the same host

     • Spread across AZs (in AWS or other clouds)

   • Prevents multiple SEs from failing together

5. SE Image Customization

   • Optionally assign specific OS images or versions

   • Useful for version control and testing in dev environments

Summary: SE Deployment and Group Config

Feature	Description
Auto Deployment	Controller deploys SEs via APIs in full-access clouds (vCenter, AWS)
Manual Deployment	User deploys SEs manually in No Access mode (OVA, AMI, etc.)
SE Group Settings	Define SE size, count, HA mode, and placement strategies
Scaling	SEs can scale automatically based on traffic thresholds

4. Networking Setup

Avi Load Balancer requires a well-planned network architecture to ensure efficient traffic routing, manageability, and integration with infrastructure services.

This section breaks down the types of networks involved, how IPs are assigned, and how DNS is integrated.

4.1 Management Network

The Management Network connects the following components:

• Controller nodes

• Service Engines (SEs)

• External services (e.g., DNS, NTP, SMTP, syslog)

Functions:

• Configuration and control traffic between Controller and SEs

• Analytics data flow (logs, telemetry)

• Controller communication with:

  • vCenter / AWS APIs

  • Licensing servers (if applicable)

  • LDAP / Active Directory

Design Tips:

• Use a dedicated management subnet

• Ensure DNS and NTP servers are reachable

• Controllers and SEs must ping each other on this network

• Avoid placing SEs on isolated management networks unless routing is configured

4.2 Data Network

The Data Network is where application traffic flows:

• Frontend traffic from clients to Virtual Services (VIPs)

• Backend traffic from SEs to application servers (Pools)

Key Design Options:

• One-Arm Mode:

  • SE uses a single interface for both frontend and backend

  • Simplifies networking (especially in flat networks)

  • SNAT (Source NAT) often required

• Two-Arm Mode:

  • SE has separate interfaces for client-side and server-side traffic

  • Allows better traffic separation and security

  • More complex routing but avoids NAT if possible

IP Assignment:

• You can:

  • Use static IPs on SE interfaces

  • Use DHCP if allowed by your network policy

• VIPs can be assigned:

  • Manually

  • Dynamically using IPAM (covered below)

Best Practices:

• Ensure MTU consistency across the path

• Place SEs as close as possible to backend servers to reduce latency

• Avoid placing all SEs in the same VLAN or fault domain if HA is critical

4.3 IPAM and DNS Profiles

IPAM (IP Address Management) handles dynamic assignment of VIPs and SE interfaces. Avi can integrate with external or use internal IPAM.

Options:

• Internal IPAM:

  • Manage IP address pools directly inside Avi Controller

  • Define subnets and IP ranges

• External IPAM:

  • Integrate with systems like Infoblox, BlueCat

  • Requires API access and credentials

DNS Profile:

• Automates the creation and deletion of DNS records for Virtual Services (FQDNs)

• Can integrate with:

  • External DNS providers via REST APIs

  • Internal DNS servers (bind, Microsoft DNS, etc.)

Example Use Case:

• When a Virtual Service is created:

  • IPAM assigns an IP from a pool

  • DNS profile creates an A record for app.example.com → VIP

Design Tips:

• Separate IP pools for each environment (e.g., dev, test, prod)

• Use meaningful FQDNs and zones

• Always define fallback behavior for DNS failures

Summary: Networking Setup

Component	Key Functions
Management Network	Controller ↔ SE communication, reachability to DNS, NTP, syslog, LDAP
Data Network	Handles client and server-side app traffic; supports one-arm or two-arm modes
IPAM	Assigns IPs for VIPs and SEs automatically or manually
DNS Profiles	Automates DNS record creation for Virtual Services

5. Virtual Services Configuration

A Virtual Service (VS) is the central object that represents an application or service exposed to users. It is the entry point where client traffic arrives and gets routed to backend servers via defined load balancing logic.

5.1 Creating a Virtual Service

When creating a Virtual Service, you define the key parameters that control how it behaves.

Step-by-Step Configuration:

• VIP (Virtual IP):

  • Can be assigned manually or dynamically using IPAM

  • This is the IP clients connect to (e.g., 10.1.1.50)

• Application Profile:

  • Defines protocol behavior (L4 or L7)

    • L4 profile: for TCP/UDP load balancing (e.g., for DNS, SIP, databases)

    • L7 profile: for HTTP/HTTPS load balancing (includes advanced routing, header inspection)

• Pool:

  • The set of backend servers that receive traffic

  • Required to forward traffic unless VS is acting as a proxy-only

• SSL Profiles (Optional):

  • Attach SSL certificate and settings for HTTPS traffic

  • Can include TLS versions, ciphers, and client authentication rules

• Analytics Profile:

  • Determines what telemetry and logs to collect

  • Customize based on performance vs. visibility trade-offs

Example Use Case:

• You want to expose https://myapp.company.com

  • Assign VIP: 192.168.10.10

  • Use L7 profile: HTTPS

  • Create a Pool with 3 backend app servers

  • Attach SSL certificate for myapp.company.com

5.2 Pool Configuration

A Pool contains the backend servers (also called "members") that handle requests forwarded by the VS.

Configuration Parameters:

• Backend Servers:

  • IP addresses or hostnames of application servers

  • Port number (e.g., 80, 443, or custom)

  • Can define weight (for weighted round-robin)

• Load Balancing Algorithm:

  • Choose from:

    • Round Robin

    • Least Connections

    • Least Load

    • Fastest Response Time

    • Consistent Hash (useful for session stickiness)

• Persistence Settings (Optional):

  • Maintains session affinity (aka “stickiness”)

    • Source IP: same client IP goes to same server

    • Cookie Insert: inserts a cookie to identify the session

• Health Monitors:

  • Actively check whether backend servers are responsive

  • Common types:

    • HTTP / HTTPS (check URL and status code)

    • TCP (check port open)

    • Custom (external scripts)

Best Practices:

• Always enable health monitors for production

• Use least-connections or fastest-response for web traffic

• Ensure persistence aligns with app session handling logic

5.3 Layer 7 (L7) Features

When using an L7 HTTP/HTTPS profile, you gain access to advanced traffic management capabilities:

Common L7 Policies:

• HTTP Request/Response Policies:

  • Match on headers, URIs, methods

  • Forward, drop, redirect, or modify traffic

  • Example: Redirect all HTTP to HTTPS

• Header Modification:

  • Add, remove, or rewrite headers

  • Useful for inserting security headers (e.g., HSTS), or passing user info

• Content Switching:

  • Route traffic to different pools based on:

    • Hostname (e.g., site1.com vs. site2.com)

    • Path (e.g., /api → Pool A, /static → Pool B)

    • Headers or cookies

Use Case Example:

• One VIP (10.0.0.100) handles multiple applications:

  • /app1 → Pool 1

  • /app2 → Pool 2

  • /api → Pool 3

This allows multi-service hosting with intelligent routing from one IP.

Summary: Virtual Services Configuration

Component	Purpose
Virtual Service	Front-end entry point with VIP and port; connects to backend pool
Pool	Defines backend servers and load balancing behavior
Persistence	Ensures consistent server selection for session-based applications
L7 Features	Enables intelligent routing, header rewrites, redirects, and more

6. SSL/TLS Setup

Handling HTTPS traffic securely is one of the most important responsibilities of a modern load balancer. In Avi, SSL/TLS functionality is highly flexible, allowing for offloading, passthrough, termination, re-encryption, and SNI-based multi-domain hosting.

6.1 Certificate Management

Before you can serve HTTPS traffic, you need to import or generate SSL certificates within the Avi Controller.

Ways to Add Certificates:

• Import an existing certificate and private key (e.g., from your certificate authority)

• Generate a Certificate Signing Request (CSR) in Avi, then get it signed externally

• Create a self-signed certificate for testing or internal apps

Certificate Chains:

• You can upload and manage full certificate chains, including:

  • Root CA

  • Intermediate CAs

  • Leaf/server certificate

Certificate Storage:

• All certificates and keys are stored centrally in the Controller

• You can reuse certificates across multiple Virtual Services

Tips:

• Always store certificates securely

• Monitor expiration dates (Avi provides alerts)

• Use naming conventions for easier management

6.2 SSL Profiles

An SSL Profile defines how HTTPS traffic should be handled by the Avi Load Balancer.

Key Settings in SSL Profiles:

• Protocol Versions:

  • Choose allowed versions (e.g., TLS 1.2, TLS 1.3)

  • Disable weak/legacy protocols (e.g., SSLv3, TLS 1.0)

• Cipher Suites:

  • Define allowed cryptographic algorithms

  • Use strong ciphers (avoid RC4, 3DES, etc.)

• Features to Enable:

  • HSTS (HTTP Strict Transport Security): Tells browsers to always use HTTPS

  • OCSP Stapling: Speeds up certificate revocation checking

  • Client Certificate Authentication: For mutual TLS (mTLS)

Best Practices:

• Use separate SSL profiles for internal vs. external services

• Enforce TLS 1.2+ only unless legacy clients require older versions

• Regularly review cipher strength to meet compliance (e.g., PCI-DSS)

6.3 SNI (Server Name Indication)

SNI allows the Avi Load Balancer to serve multiple HTTPS domains from the same VIP.

How It Works:

• Client sends the requested domain name in the TLS handshake

• Avi matches this to a configured SNI hostname in a Virtual Service

• It selects the correct:

  • SSL certificate

  • Backend Pool

Use Case Example:
You want to serve both www.site1.com and www.site2.com on the same IP:

• Create one VS with VIP 203.0.113.10

• Add SNI mappings:

  • www.site1.com → Cert 1 → Pool 1

  • www.site2.com → Cert 2 → Pool 2

Each domain can have its own SSL cert and backend servers.

Design Tips:

• Group similar services under a shared VIP for easier scaling

• Always test SNI config using tools like curl -v --resolve or browser dev tools

• Ensure clients support SNI (most modern clients do)

Summary: SSL/TLS Setup

Feature	Purpose & Best Practices
Certificate Management	Import, generate, or request certificates; use secure storage and monitoring
SSL Profiles	Define TLS versions, ciphers, HSTS, OCSP, and mTLS as needed
SNI	Host multiple secure domains on one IP, each with its own cert and pool

7. Role-Based Access Control (RBAC)

RBAC allows administrators to define who can access what, and what they are allowed to do within the Avi Controller. This is essential in multi-team or multi-tenant environments, or anywhere that access must be tightly controlled.

7.1 System Roles (Built-in)

VMware Avi comes with several predefined system roles to cover common use cases:

Role Name	Permissions
Read-Only	View all configurations, metrics, logs—but cannot make any changes
Operations	Perform operational tasks (restart Virtual Services, view SE status, etc.)
Tenant-Admin	Full control over objects within assigned tenants only
Superuser	Full control over the entire system; can manage users, roles, settings

Use Case Examples:

• Assign Operations role to NOC (Network Operations Center) staff

• Assign Read-Only to auditors or security reviewers

• Assign Tenant-Admin to app owners within multi-tenant environments

7.2 Custom Roles

If the built-in roles aren’t flexible enough, you can create custom roles with fine-grained control.

Role Customization Options:

• Grant permissions per object type:

  • Virtual Services

  • Pools

  • SSL Certificates

  • Tenants

  • SE Groups

• Define permission levels:

  • No Access

  • Read Access

  • Write Access

  • Full Access

Assignment Process:

• Roles are created in the UI or via API

• Assign a role to one or more users or user groups

Best Practices:

• Follow the principle of least privilege

• Create custom roles for specific job functions

• Use naming conventions like dev-ops-read, prod-admin-write, etc.

7.3 Authentication Methods

To manage user identities and avoid manual user creation, Avi integrates with enterprise identity systems.

A. Local Authentication

• Users and passwords stored locally in the Controller

• Simple but not ideal for larger organizations

• Use only for admin bootstrap or small-scale environments

B. LDAP / Active Directory (AD)

• Integrate with Microsoft AD or OpenLDAP

• Users authenticate with corporate credentials

• Supports group-based role mapping

Setup Requires:

• LDAP server IP or hostname

• Bind DN and credentials

• Base DN for user and group search

• Optional: group-to-role mapping rules

C. SAML / OAuth

• Support for Single Sign-On (SSO)

• Integrate with identity providers like:

  • Okta

  • Azure AD

  • Google Workspace

  • Ping Identity

Benefits:

• Centralized access control

• Two-factor/multi-factor authentication support

• Role mapping via SAML attributes or OAuth scopes

Summary: Role-Based Access Control (RBAC)

Feature	Description
System Roles	Predefined access levels for basic operational and admin use cases
Custom Roles	Define fine-grained permissions for each object type
Local Auth	Simple user/password auth stored in Avi
LDAP/AD	Enterprise-grade auth via corporate directory
SAML/OAuth	Enables secure SSO with identity providers

8. Logging and Analytics Setup

Avi’s built-in analytics and logging engine provides real-time insights, historical data, and deep visibility into application and infrastructure behavior. This section explains how to configure logging destinations, customize analytics profiles, and set up alerting for operational monitoring.

8.1 Logging Destinations

By default, logs are collected and viewable within the Avi UI, but in production environments you’ll want to stream logs to external systems for long-term storage and correlation with other data sources.

Supported External Logging Destinations:

• Syslog servers

  • Traditional method used for centralized logging (e.g., for compliance)

• Kafka

  • High-performance message bus for big data and log analytics pipelines

• Logstash / ELK Stack (Elasticsearch, Logstash, Kibana)

  • Use for advanced indexing, searching, and visualization of logs

• vRealize Log Insight

  • Deep integration with VMware environments

Types of Logs Generated:

• Virtual Service logs (HTTP requests/responses)

• System events (e.g., SE restart, config changes)

• Security events (WAF, SSL issues)

• Health monitor logs

Tips:

• Ensure log destinations are reachable from the Controller

• Use structured log formats (e.g., JSON) if supported by your logging tools

• Set log retention policies in the external system

8.2 Analytics Profiles

Analytics profiles control what kind of telemetry is collected and how frequently. They can be applied per Virtual Service for flexibility.

Customizable Parameters:

• Logging Level:

  • Headers only

  • Full body logging (for debugging; use cautiously in production)

  • Timing-only logs (minimal performance overhead)

• Client Insights:

  • Enable or disable collection of:

    • Latency metrics

    • SSL handshake times

    • HTTP error codes

• Real-Time Metrics:

  • Live view of:

    • Connection rate

    • Server response time

    • Retransmissions

    • Packet loss and health score

• Data Sampling:

  • Control how often data points are collected

  • Reduce frequency for less critical services

Best Practices:

• Apply full analytics only where needed (e.g., business-critical apps)

• Use lighter profiles for backend/internal services to conserve resources

• Use consistent profile names (e.g., prod-high-detail, test-basic)

8.3 Alerting

Avi provides a flexible system to generate alerts based on thresholds and events.

Alert Delivery Methods:

• Email Notifications

  • Configure SMTP during setup

  • Alerts sent to distribution lists or admin addresses

• SNMP Traps

  • For integration with network monitoring tools like Nagios, SolarWinds, or Zabbix

• Webhooks

  • Push alerts into platforms like:

    • Slack

    • Microsoft Teams

    • ServiceNow

    • Custom REST APIs

Alert Conditions:

• System Health:

  • Controller node down

  • SE high CPU or memory

• Virtual Service:

  • Backend pool members down

  • VIP unreachable

• Security:

  • WAF attack detection

  • Certificate expiration warnings

Thresholds and Tuning:

• You can customize:

  • Alert severity (Info, Warning, Critical)

  • Frequency of repeat alerts

  • Conditions that trigger alerts

Summary: Logging and Analytics Setup

Component	Function and Best Practices
External Logging	Stream logs to Syslog, Kafka, ELK, or Log Insight for long-term storage
Analytics Profiles	Control logging detail level and metrics collection per Virtual Service
Alerting	Get real-time notifications via email, SNMP, or webhook for critical events

Installing, Configuring, and Setup (Additional Content)

1. Pre-Deployment Checklist

Before deploying the Avi Load Balancer, verify that the environment is properly prepared, to prevent configuration issues and runtime failures.

Key Areas to Validate:

• Hardware Resources:

  • Controller nodes:

    • Minimum: 8 vCPU, 24 GB RAM, 128 GB disk

  • Service Engines (SEs):

    • Depends on load; typically 2–8 vCPU per SE

    • At least 2 NICs recommended: management + data

• Network Connectivity:

  • Management Network: Controller and SE must reach each other.

  • Data Network: SE ↔ Application Pool connectivity.

  • DNS: Required for hostname resolution.

  • NTP: All nodes must sync with a reliable NTP server.

• Firewall and Port Rules:

  • Common required ports:

    • TCP 443 – UI/API access

    • TCP 5054 – Controller ↔ SE communication

    • UDP 123 – NTP

    • TCP/UDP for Syslog, DNS, SMTP

• Certificates and Licensing:

  • Prepare valid TLS certificates if HTTPS is required.

  • Have license keys ready (eval or production).

• Controller Visibility:

  • Ensure all Controller nodes can ping each other and connect via TCP 443.

• Backup Plan:

  • Take a snapshot of VM templates (OVA/OVF) before configuration.

  • Plan backup policy from day one.

2. Version Management and Upgrade Planning

Safe upgrade practices are critical to avoid outages, configuration drift, or version mismatch between components.

Upgrade Process Overview:

1. Upgrade Sequence:

   • Controller cluster first, followed by:

     • Service Engines

     • SDKs and CLI tools (if used)

2. Pre-Upgrade Checklist:

   • Backup system configuration.

   • Review release notes and compatibility matrix.

   • Validate NTP, DNS, and cluster quorum.

3. Upgrade Validation:

   • Check:

     • Controller cluster health

     • SE connection status

     • Virtual Service uptime and stats

4. Scheduling and Failover Planning:

   • Use maintenance windows and traffic draining.

   • Upgrade one node at a time.

   • Ensure automatic SE upgrade is enabled (optional).

5. Version Compatibility Matrix:

   • Controller version must always be equal to or newer than SE version.

   • Mismatches can break features like analytics or logs.

6. Rollback Procedures:

   • Use snapshots or saved config for recovery.

   • Logs for diagnostics:

     • Controller: /var/log/avi/

     • Upgrade status: /var/lib/avi/upgrade_status.json

3. Troubleshooting and Recovery Procedures

Anticipate common installation or operation errors and how to resolve them efficiently.

Key Troubleshooting Scenarios:

• Controller Cluster Join Failure:

  • Check DNS resolution, NTP sync, firewall rules, or port 443 connectivity.

• SE Registration Failure:

  • Confirm management IP is reachable from Controller.

  • Ensure no NAT/firewall blocks port 5054.

• VIP Unreachable:

  • Review:

    • IPAM allocation

    • ECMP configuration

    • Routing or ARP table inconsistencies

• TLS/SSL Errors:

  • Check certificate format (PEM), expiration date, key-pair matching.

  • Use:

    • show virtualservice – to view VS and cert status

    • debugvs or logs for deeper inspection

• Command Line Tools:

  • show cluster

  • show se

  • show virtualservice

  • show runtime

• Log Locations:

  • Controller: /var/log/avi/

  • SE: /opt/avi/log/

• Recovery Best Practices:

  • Restart problematic nodes or SE.

  • Re-deploy SE from Controller if lost.

  • Restore from latest backup if system corruption occurs.

4. Automation and Infrastructure-as-Code (IaC)

Automating deployment ensures consistency, repeatability, and reduced human error.

Terraform Examples:

• Define:

  • Controller credentials

  • SE Group templates

  • Virtual Services with Pool association

• Example module:

  resource "avi_virtualservice" "web_vs" {
    name     = "web-vs"
    vip {
      ip_address = "192.168.1.10"
    }
    pool_ref = avi_pool.web_pool.id
  }
  

Ansible Examples:

• Automate:

  • VS creation

  • Pool and health monitor attachment

  • Upload SSL certificates

• Sample playbook:

  - name: Create a Virtual Service
    avi_virtualservice:
      controller: 10.1.1.10
      username: admin
      password: "{{ avi_password }}"
      name: test-vs
      tenant: admin
      vip:
        - ip_address: 10.1.1.100
      pool_ref: /api/pool?name=backend-pool
  

Cloud Init / REST API:

• Use REST API to bootstrap and configure Controllers on first login.

• Integrate into DevOps pipelines for full lifecycle automation.

Automation Validation Tips:

• Use avi_api_session.py to validate object existence.

• Always test playbooks/modules in a sandbox before production.

• Automate config export for rollback.

5. Licensing and Cost Impact During Deployment

Licensing impacts not only functionality but also scaling decisions.

License Types:

• Throughput-based: Total Gbps across SEs.

• vCPU-based: Cores assigned to SEs.

• Per-App (VS-based): Number of active virtual services.

Impact on Design:

• vCPU model encourages fewer, larger SEs.

• Per-VS model promotes microservices isolation.

• Throughput model is ideal for low-QPS, high-volume traffic (e.g., video streaming).

License Management:

• Go to Administration > Licensing in UI.

• Upload license key via UI or API.

• Evaluation vs. Production Licenses:

  • Eval may expire or have feature restrictions.

  • Production license unlocks full features and support.

System Behavior on Overuse:

• Alert generated when exceeding entitlement.

• Some features may degrade or be blocked.

Cost Optimization Tips:

• Use Elastic HA model to spin up SEs only under load.

• Rightsize SEs to avoid underutilized resources.

• Periodically review license usage graphs.

6. Backup and Restore Strategy

Disaster resilience depends on reliable configuration backups.

Backup Types:

• Full backup: Includes all tenants, services, config.

• Partial backup: Per-tenant or component-level.

Backup Methods:

• Manual:

  • Via UI: Administration > System > Backup

  • CLI/API: POST /api/backupconfiguration

• Scheduled Backups:

  • Daily/weekly automated jobs.

  • Configure retention count and storage path.

Storage Locations:

• Local to Controller

• Remote SFTP or SCP targets

• Object storage (e.g., S3 – via API integration)

Restore Procedure:

• Choose a backup file.

• Restore config from UI or API.

• Validate:

  • VS reachability

  • SE registration

  • RBAC roles

Best Practices:

• Frequency: At least weekly or before major changes.

• Retention: 30–90 days depending on policy.

• Backup before upgrades, tenant onboarding, or SE changes.

7. Post-Installation Validation and Health Checks

Ensure your environment is production-ready before traffic cutover.

Checklist:

• Controller Cluster Health:

  • UI → Administration → Cluster Status

  • CLI: show cluster status

• SE Registration:

  • Confirm heartbeats and licensing status.

  • Look for “Connected” status.

• Virtual Service Validation:

  • Use curl or browser to check HTTP/HTTPS access.

  • Check health monitor stats and logs.

• External Services Test:

  • DNS resolution

  • NTP sync (check show ntp)

  • SMTP/LDAP login tests

• Alerting/Logging Validation:

  • Syslog: Are messages reaching external targets?

  • SNMP traps sent?

  • Email alerts delivered?

• Performance Testing:

  • Baseline latency, CPS (connections/sec), bandwidth

  • Use tools like ApacheBench, curl, JMeter

• Generate Baseline Report:

  • Export analytics dashboards and cluster status

  • Useful for future comparisons and audits