Azure Load Balancer Skill

This skill provides expert guidance for Azure Load Balancer. Covers troubleshooting, best practices, decision making, architecture & design patterns, limits & quotas, security, configuration, integrations & coding patterns, and deployment. It combines local quick-reference content with remote documentation fetching capabilities.

How to Use This Skill

IMPORTANT for Agent: This file may be large. Use the Category Index below to locate relevant sections, then use read_file with specific line ranges (e.g., L136-L144) to read the sections needed for the user's question

IMPORTANT for Agent: If metadata.generated_at is more than 3 months old, suggest the user pull the latest version from the repository. If mcp_microsoftdocs tools are not available, suggest the user install it: Installation Guide

This skill requires network access to fetch documentation content:

Preferred: Use mcp_microsoftdocs:microsoft_docs_fetch with query string from=learn-agent-skill. Returns Markdown.
Fallback: Use fetch_webpage with query string from=learn-agent-skill&accept=text/markdown. Returns Markdown.

Category Index

Category	Lines	Description
Troubleshooting	L37-L52	Diagnosing and fixing Azure Load Balancer issues: deployment errors, health events/logs, probes, connectivity/backend traffic, SNAT/timeouts, IMDS errors, and resource health/availability.
Best Practices	L53-L60	Guidance on deploying Azure Load Balancer with VM scale sets, configuring inbound NAT, and building custom HTTP/HTTPS health probes (Python) using recommended best practices.
Decision Making	L61-L68	Guidance on choosing the right Load Balancer SKU and planning/migrating configurations, including Basic→Standard, NAT rules v1→v2, and AWS NLB→Azure Load Balancer.
Architecture & Design Patterns	L69-L73	Design patterns for outbound internet connectivity using Azure Load Balancer, including egress-only architectures and SNAT configuration, scaling, and best practices.
Limits & Quotas	L74-L79	Configuring Azure Load Balancer TCP idle timeouts and reset options, and understanding how and when TCP resets are triggered and affect client connections.
Security	L80-L85	Security guidance for Azure Load Balancer: hardening, access controls, and using Azure DDoS Protection to defend against volumetric and network attacks.
Configuration	L86-L106	Configuring Azure Load Balancer behavior: backends/frontends (incl. cross-subscription, IP-based, outbound-only), rules, health probes, traffic distribution, monitoring, and SNAT outbound rules.
Integrations & Coding Patterns	L107-L114	Using Azure IMDS and Monitor to programmatically query load balancer/VM IP metadata and retrieve load balancer metrics via CLI and REST APIs.
Deployment	L115-L119	Guides for deploying Load Balancers: replicating configurations across regions and automating upgrades from Basic to Standard using PowerShell.

Troubleshooting

Topic	URL
Fix common Azure Load Balancer deployment errors	https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-common-deployment-errors
Interpret Azure Load Balancer health event logs	https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-health-event-logs
Monitor and alert on LoadBalancerHealthEvent logs	https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-monitor-alert-health-event-logs
Use metrics, alerts, and health to diagnose Azure Load Balancer	https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-standard-diagnostics
Test Azure Public Load Balancer frontend reachability	https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-test-frontend-reachability
Troubleshoot common Azure Load Balancer connectivity issues	https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-troubleshoot
Troubleshoot Azure Load Balancer backend traffic problems	https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-troubleshoot-backend-traffic
Troubleshoot Azure Load Balancer health event log types	https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-troubleshoot-health-event-logs
Troubleshoot Azure Load Balancer health probe status issues	https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-troubleshoot-health-probe-status
Resolve common Azure IMDS error codes for Load Balancer	https://learn.microsoft.com/en-us/azure/load-balancer/troubleshoot-load-balancer-imds
Troubleshoot Azure Load Balancer outbound SNAT and timeout issues	https://learn.microsoft.com/en-us/azure/load-balancer/troubleshoot-outbound-connection
Diagnose Azure Load Balancer resource health and availability	https://learn.microsoft.com/en-us/azure/load-balancer/troubleshoot-rhc

Best Practices

Topic	URL
Configure inbound NAT rules for VM scale sets	https://learn.microsoft.com/en-us/azure/load-balancer/configure-inbound-nat-rules-vm-scale-set
Implement custom HTTP/HTTPS health probes with Python	https://learn.microsoft.com/en-us/azure/load-balancer/create-custom-http-health-probe-howto
Apply Azure Load Balancer deployment best practices	https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-best-practices
Use Azure Standard Load Balancer with virtual machine scale sets	https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-standard-virtual-machine-scale-sets

Decision Making

Topic	URL
Plan and execute upgrade from Basic to Standard Load Balancer	https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-basic-upgrade-guidance
Migrate Azure Load Balancer NAT rules v1 to v2	https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-nat-pool-migration
Plan AWS NLB to Azure Load Balancer migration	https://learn.microsoft.com/en-us/azure/load-balancer/network-load-balancing-aws-to-azure-how-to
Choose the right Azure Load Balancer SKU	https://learn.microsoft.com/en-us/azure/load-balancer/skus

Architecture & Design Patterns

Topic	URL
Design outbound internet connectivity with Azure Load Balancer SNAT	https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-outbound-connections

Limits & Quotas

Topic	URL
Configure Azure Load Balancer TCP idle timeout and reset	https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-tcp-idle-timeout
Understand Azure Load Balancer TCP reset behavior	https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-tcp-reset

Security

Topic	URL
Apply security best practices to Azure Load Balancer	https://learn.microsoft.com/en-us/azure/load-balancer/secure-load-balancer
Protect Azure Load Balancer with Azure DDoS Protection	https://learn.microsoft.com/en-us/azure/load-balancer/tutorial-protect-load-balancer-ddos

Configuration

Topic	URL
Configure Azure Load Balancer backend pools by IP	https://learn.microsoft.com/en-us/azure/load-balancer/backend-pool-management
Configure cross-subscription backends for Azure Load Balancer	https://learn.microsoft.com/en-us/azure/load-balancer/cross-subscription-how-to-attach-backend
Attach cross-subscription frontend IPs to Azure Load Balancer	https://learn.microsoft.com/en-us/azure/load-balancer/cross-subscription-how-to-attach-frontend
Create global load balancer with cross-subscription backends	https://learn.microsoft.com/en-us/azure/load-balancer/cross-subscription-how-to-global-backend
Configure cross-subscription internal Azure load balancer	https://learn.microsoft.com/en-us/azure/load-balancer/cross-subscription-how-to-internal-load-balancer
Configure outbound-only Azure Load Balancer with Bastion	https://learn.microsoft.com/en-us/azure/load-balancer/egress-only
Configure Azure Load Balancer health probe settings	https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-custom-probe-overview
Configure Azure Load Balancer traffic distribution mode	https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-distribution-mode
Configure DHCPv6 on Linux VMs for Azure IPv6	https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-ipv6-for-linux
Understand Azure Load Balancer portal configuration options	https://learn.microsoft.com/en-us/azure/load-balancer/manage
Manage Azure Load Balancer backend admin state	https://learn.microsoft.com/en-us/azure/load-balancer/manage-admin-state-how-to
Configure and manage Azure Load Balancer inbound NAT rules	https://learn.microsoft.com/en-us/azure/load-balancer/manage-inbound-nat-rules
Configure Azure Load Balancer health probes	https://learn.microsoft.com/en-us/azure/load-balancer/manage-probes-how-to
Configure Azure Load Balancer rule types and properties	https://learn.microsoft.com/en-us/azure/load-balancer/manage-rules-how-to
Configure monitoring for Azure Load Balancer with Azure Monitor	https://learn.microsoft.com/en-us/azure/load-balancer/monitor-load-balancer
Reference monitoring metrics and logs for Azure Load Balancer	https://learn.microsoft.com/en-us/azure/load-balancer/monitor-load-balancer-reference
Configure outbound rules for Azure Load Balancer SNAT	https://learn.microsoft.com/en-us/azure/load-balancer/outbound-rules

Integrations & Coding Patterns

Topic	URL
Use Azure IMDS to retrieve load balancer metadata	https://learn.microsoft.com/en-us/azure/load-balancer/howto-load-balancer-imds
Query load balancer and VM IP info via Azure IMDS	https://learn.microsoft.com/en-us/azure/load-balancer/instance-metadata-service-load-balancer
Retrieve Azure Load Balancer metrics using Azure Monitor CLI	https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-monitor-metrics-cli
Query Azure Load Balancer metrics via REST API	https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-query-metrics-rest-api

Deployment

Topic	URL
Replicate Azure Load Balancer configuration across regions	https://learn.microsoft.com/en-us/azure/load-balancer/move-across-regions-azure-load-balancer
Automate Basic-to-Standard Load Balancer upgrade with PowerShell	https://learn.microsoft.com/en-us/azure/load-balancer/upgrade-basic-standard-with-powershell

azure-load-balancer