1---2name: azure-load-balancer3description: Expert knowledge for Azure Load Balancer development including troubleshooting, best practices, decision making, architecture & design patterns, limits & quotas, security, configuration, integrations & coding patterns, and deployment. Use when configuring LB rules/probes, SNAT/outbound, VMSS backends, IMDS/Monitor APIs, or DDoS/NSG protection, and other Azure Load Balancer related development tasks. Not for Azure Application Gateway (use azure-application-gateway), Azure Front Door (use azure-front-door), Azure Traffic Manager (use azure-traffic-manager), Azure Virtual Network (use azure-virtual-network).4---5# Azure Load Balancer Skill67This 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.89## How to Use This Skill1011> **IMPORTANT for Agent**: Use the **Category Index** below to locate relevant sections. For categories with line ranges (e.g., `L35-L120`), use `read_file` with the specified lines. For categories with file links (e.g., `[security.md](security.md)`), use `read_file` on the linked reference file1213This skill requires **network access** to fetch documentation content:14- **Preferred**: Use `mcp_microsoftdocs:microsoft_docs_fetch`. Returns Markdown.15- **Fallback**: Use `WebFetch`. Returns Markdown.1617## Category Index1819| Category | Lines | Description |20|----------|-------|-------------|21| Troubleshooting | L33-L40 | Diagnosing and fixing Azure Load Balancer issues: deployment errors, health events/logs, probes, connectivity/backend traffic, SNAT/timeouts, IMDS errors, and resource health/availability. |22| Best Practices | L41-L48 | 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. |23| Decision Making | L49-L56 | Guidance on choosing the right Load Balancer SKU, upgrading Basic to Standard, migrating from AWS NLB, and moving from inbound NAT rules v1 to v2. |24| Architecture & Design Patterns | L57-L62 | Design patterns for traffic distribution and session affinity, plus guidance for configuring outbound internet connectivity and SNAT behavior with Azure Load Balancer. |25| Limits & Quotas | L63-L69 | Load Balancer connection limits, SNAT/port behaviors, TCP idle timeout configuration, and how/when TCP resets occur for troubleshooting connectivity issues. |26| Security | L70-L75 | Securing Azure Load Balancer with NSGs and other controls, and enabling/configuring Azure DDoS Protection to defend against volumetric and protocol attacks. |27| Configuration | L76-L96 | Configuring Azure Load Balancer behavior: backends/frontends (incl. cross-subscription, IP-based, outbound-only), rules, health probes, traffic distribution, monitoring, and SNAT outbound rules. |28| Integrations & Coding Patterns | L97-L104 | Using IMDS, Azure Monitor CLI, and REST APIs to query load balancer/VM IPs, retrieve metadata, and collect/load metrics for integration and automation. |29| Deployment | L105-L109 | Guides for deploying Load Balancers: replicating configurations across regions and automating upgrades from Basic to Standard using PowerShell. |3031### Troubleshooting32| Topic | URL |33|-------|-----|34| Interpret Azure Load Balancer health event logs | https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-health-event-logs |35| Monitor and alert on LoadBalancerHealthEvent logs | https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-monitor-alert-health-event-logs |36| Use metrics, alerts, and health to diagnose Azure Load Balancer | https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-standard-diagnostics |37| Test Azure Public Load Balancer frontend reachability | https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-test-frontend-reachability |3839### Best Practices40| Topic | URL |41|-------|-----|42| Configure inbound NAT rules for VM scale sets | https://learn.microsoft.com/en-us/azure/load-balancer/configure-inbound-nat-rules-vm-scale-set |43| Implement custom HTTP/HTTPS health probes with Python | https://learn.microsoft.com/en-us/azure/load-balancer/create-custom-http-health-probe-howto |44| Apply Azure Load Balancer deployment best practices | https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-best-practices |45| 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 |4647### Decision Making48| Topic | URL |49|-------|-----|50| Plan and execute upgrade from Basic to Standard Load Balancer | https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-basic-upgrade-guidance |51| Decide and migrate from inbound NAT rules v1 to v2 | https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-nat-pool-migration |52| Migrate AWS Network Load Balancer workloads to Azure Load Balancer | https://learn.microsoft.com/en-us/azure/load-balancer/network-load-balancing-aws-to-azure-how-to |53| Choose the right Azure Load Balancer SKU | https://learn.microsoft.com/en-us/azure/load-balancer/skus |5455### Architecture & Design Patterns56| Topic | URL |57|-------|-----|58| Choose Azure Load Balancer distribution modes | https://learn.microsoft.com/en-us/azure/load-balancer/distribution-mode-concepts |59| Design outbound internet connectivity with Azure Load Balancer SNAT | https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-outbound-connections |6061### Limits & Quotas62| Topic | URL |63|-------|-----|64| Azure Load Balancer FAQs with limits and behaviors | https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-faqs |65| Configure Azure Load Balancer TCP idle timeout and reset | https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-tcp-idle-timeout |66| Understand Azure Load Balancer TCP reset behavior | https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-tcp-reset |6768### Security69| Topic | URL |70|-------|-----|71| Apply security controls to Azure Load Balancer | https://learn.microsoft.com/en-us/azure/load-balancer/secure-load-balancer |72| Protect Azure Load Balancer with Azure DDoS Protection | https://learn.microsoft.com/en-us/azure/load-balancer/tutorial-protect-load-balancer-ddos |7374### Configuration75| Topic | URL |76|-------|-----|77| Configure Azure Load Balancer backend pools by IP | https://learn.microsoft.com/en-us/azure/load-balancer/backend-pool-management |78| Configure cross-subscription backends for Azure Load Balancer | https://learn.microsoft.com/en-us/azure/load-balancer/cross-subscription-how-to-attach-backend |79| Attach cross-subscription frontend IPs to Azure Load Balancer | https://learn.microsoft.com/en-us/azure/load-balancer/cross-subscription-how-to-attach-frontend |80| Create global load balancer with cross-subscription backends | https://learn.microsoft.com/en-us/azure/load-balancer/cross-subscription-how-to-global-backend |81| Configure cross-subscription internal Azure load balancer | https://learn.microsoft.com/en-us/azure/load-balancer/cross-subscription-how-to-internal-load-balancer |82| Configure outbound-only Azure Load Balancer with Bastion | https://learn.microsoft.com/en-us/azure/load-balancer/egress-only |83| Configure Azure Load Balancer health probe settings | https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-custom-probe-overview |84| Configure Azure Load Balancer traffic distribution mode | https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-distribution-mode |85| Configure DHCPv6 on Linux VMs for Azure IPv6 | https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-ipv6-for-linux |86| Understand Azure Load Balancer portal configuration options | https://learn.microsoft.com/en-us/azure/load-balancer/manage |87| Manage Azure Load Balancer backend admin state | https://learn.microsoft.com/en-us/azure/load-balancer/manage-admin-state-how-to |88| Configure and manage Azure Load Balancer inbound NAT rules | https://learn.microsoft.com/en-us/azure/load-balancer/manage-inbound-nat-rules |89| Configure Azure Load Balancer health probes | https://learn.microsoft.com/en-us/azure/load-balancer/manage-probes-how-to |90| Configure Azure Load Balancer rule types and properties | https://learn.microsoft.com/en-us/azure/load-balancer/manage-rules-how-to |91| Configure monitoring for Azure Load Balancer with Azure Monitor | https://learn.microsoft.com/en-us/azure/load-balancer/monitor-load-balancer |92| Reference monitoring metrics and logs for Azure Load Balancer | https://learn.microsoft.com/en-us/azure/load-balancer/monitor-load-balancer-reference |93| Configure outbound rules for Azure Load Balancer SNAT | https://learn.microsoft.com/en-us/azure/load-balancer/outbound-rules |9495### Integrations & Coding Patterns96| Topic | URL |97|-------|-----|98| Use IMDS to retrieve Azure Load Balancer metadata | https://learn.microsoft.com/en-us/azure/load-balancer/howto-load-balancer-imds |99| Query load balancer and VM IPs via IMDS | https://learn.microsoft.com/en-us/azure/load-balancer/instance-metadata-service-load-balancer |100| Retrieve Azure Load Balancer metrics using Azure Monitor CLI | https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-monitor-metrics-cli |101| Query Azure Load Balancer metrics via REST API | https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-query-metrics-rest-api |102103### Deployment104| Topic | URL |105|-------|-----|106| Replicate Azure Load Balancer configuration across regions | https://learn.microsoft.com/en-us/azure/load-balancer/move-across-regions-azure-load-balancer |107| Automate Basic-to-Standard Load Balancer upgrade with PowerShell | https://learn.microsoft.com/en-us/azure/load-balancer/upgrade-basic-standard-with-powershell |
atc-net