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articles/reliability/reliability-functions.md

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This article describes reliability support in [Azure Functions](../azure-functions/functions-overview.md), and covers both intra-regional resiliency with [availability zones](#availability-zone-support) and [cross-region recovery and business continuity](#cross-region-disaster-recovery-and-business-continuity). For a more detailed overview of reliability principles in Azure, see [Azure reliability](/azure/architecture/framework/resiliency/overview).
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Availability zone support for Azure Functions is available on both Premium (Elastic Premium) and Dedicated (App Service) plans. This article focuses on zone redundancy support for Premium plans. For zone redundancy on Dedicated plans, see [Migrate App Service to availability zone support](migrate-app-service.md).
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Availability zone support for Azure Functions is available on both Premium (Elastic Premium) and Dedicated (App Service) plans. This article focuses on zone redundancy support for Premium plans. For zone redundancy on Dedicated plans, see [Migrate App Service to availability zone support](migrate-app-service.md).
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## Availability zone support
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### Multi-region disaster recovery
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Because there is no built-in redundancy available, functions run in a function app in a specific Azure region. To avoid loss of execution during outages, you can redundantly deploy the same functions to function apps in multiple regions. To learn more about multi-region deployments, see the guidance in [Highly available multi-region web application](/azure/architecture/reference-architectures/app-service-web-app/multi-region).
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Because there is no built-in redundancy available, functions run in a function app in a specific Azure region. To avoid loss of execution during outages, you can redundantly deploy the same functions to function apps in multiple regions. To learn more about multi-region deployments, see the guidance in [Highly available multi-region web application](/azure/architecture/reference-architectures/app-service-web-app/multi-region).
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When you run the same function code in multiple regions, there are two patterns to consider, [active-active](#active-active-pattern-for-http-trigger-functions) and [active-passive](#active-passive-pattern-for-non-https-trigger-functions).
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![Active-passive example architecture](../azure-functions/media/functions-geo-dr/active-passive.png)
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Before failover, publishers sending to the shared alias route to the primary event hub. The primary function app is listening exclusively to the primary event hub. The secondary function app is passive and idle. As soon as failover is initiated, publishers sending to the shared alias are routed to the secondary event hub. The secondary function app now becomes active and starts triggering automatically. Effective failover to a secondary region can be driven entirely from the event hub, with the functions becoming active only when the respective event hub is active.
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Before failover, publishers sending to the shared alias route to the primary event hub. The primary function app is listening exclusively to the primary event hub. The secondary function app is passive and idle. As soon as failover is initiated, publishers sending to the shared alias are routed to the secondary event hub. The secondary function app now becomes active and starts triggering automatically. Effective failover to a secondary region can be driven entirely from the event hub, with the functions becoming active only when the respective event hub is active.
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Read more on information and considerations for failover with [Service Bus](../service-bus-messaging/service-bus-geo-dr.md) and [Event Hubs](../event-hubs/event-hubs-geo-dr.md).
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