Cross-region disaster recovery for B2B integration accounts in Azure Logic Apps

B2B workloads involve money transactions like orders and invoices. During a disaster event, it's critical for a business to quickly recover to meet the business-level SLAs agreed upon with their partners. This article demonstrates how to build a business continuity plan for B2B workloads.

  • Disaster Recovery readiness
  • Fail over to secondary region during a disaster event
  • Fall back to primary region after a disaster event

Disaster Recovery readiness

  1. Identify a secondary region and create an integration account in the secondary region.

  2. Add partners, schemas, and agreements for the required message flows where the run status needs to be replicated to secondary region integration account.

    Tip

    Make sure there's consistency in the integration account artifact's naming convention across regions.

  3. To pull the run status from the primary region, create a logic app in the secondary region.

    This logic app should have a trigger and an action. The trigger should connect to primary region integration account, and the action should connect to secondary region integration account. Based on the time interval, the trigger polls the primary region run status table and pulls the new records, if any. The action updates them to secondary region integration account. This helps to get incremental runtime status from primary region to secondary region.

  4. Business continuity in Logic Apps integration account is designed to support based on B2B protocols - X12, AS2, and EDIFACT. To find detailed steps, select the respective links.

  5. The recommendation is to deploy all primary region resources in a secondary region too.

    Primary region resources include Azure SQL Database or Azure Cosmos DB, Azure Service Bus and Azure Event Hubs used for messaging, Azure API Management, and the Azure Logic Apps feature in Azure App Service.

  6. Establish a connection from a primary region to a secondary region. To pull the run status from a primary region, create a logic app in a secondary region.

    The logic app should have a trigger and an action. The trigger should connect to a primary region integration account. The action should connect to a secondary region integration account. Based on the time interval, the trigger polls the primary region run status table and pulls the new records, if any. The action updates them to a secondary region integration account. This process helps to get incremental runtime status from the primary region to the secondary region.

Business continuity in a Logic Apps integration account provides support based on the B2B protocols X12, AS2, and EDIFACT. For detailed steps on using X12 and AS2, see X12 and AS2 in this article.

Fail over to a secondary region during a disaster event

During a disaster event, when the primary region is not available for business continuity, direct traffic to the secondary region. A secondary region helps a business to recover functions quickly to meet the RPO/RTO agreed upon by their partners. It also minimizes efforts to fail over from one region to another region.

There is an expected latency while copying control numbers from a primary region to a secondary region. To avoid sending duplicate generated control numbers to partners during a disaster event, the recommendation is to increment the control numbers in the secondary region agreements by using PowerShell cmdlets.

Fall back to a primary region post-disaster event

To fall back to a primary region when it is available, follow these steps:

  1. Stop accepting messages from partners in the secondary region.

  2. Increment the generated control numbers for all the primary region agreements by using PowerShell cmdlets.

  3. Direct traffic from the secondary region to the primary region.

  4. Check that the logic app created in the secondary region for pulling run status from the primary region is enabled.

X12

Business continuity for EDI X12 documents is based on control numbers:

Tip

You can also use the X12 quick start template to create logic apps. Creating primary and secondary integration accounts are prerequisites to use the template. The template helps to create two logic apps, one for received control numbers and another for generated control numbers. Respective triggers and actions are created in the logic apps, connecting the trigger to the primary integration account and the action to the secondary integration account.

Prerequisites

To enable disaster recovery for inbound messages, select the duplicate check settings in the X12 agreement's Receive Settings.

Select duplicate check settings

  1. Create a logic app in a secondary region.

  2. Search on X12, and select X12 - When a control number is modified.

    Search for X12

    The trigger prompts you to establish a connection to an integration account. The trigger should be connected to a primary region integration account.

  3. Enter a connection name, select your primary region integration account from the list, and choose Create.

    Primary region integration account name

  4. The DateTime to start control number sync setting is optional. The Frequency can be set to Day, Hour, Minute, or Second with an interval.

    DateTime and Frequency

  5. Select New step > Add an action.

    New step, Add an action

  6. Search on X12, and select X12 - Add or update control numbers.

    Add or update control numbers

  7. To connect an action to a secondary region integration account, select Change connection > Add new connection for a list of the available integration accounts. Enter a connection name, select your secondary region integration account from the list, and choose Create.

    Secondary region integration account name

  8. Switch to raw inputs by clicking on the icon in upper right corner.

    Switch to raw inputs

  9. Select Body from the dynamic content picker, and save the logic app.

    Dynamic content fields

    Based on the time interval, the trigger polls the primary region received control number table and pulls the new records. The action updates the records in the secondary region integration account. If there are no updates, the trigger status appears as Skipped.

    Control number table

Based on the time interval, the incremental runtime status replicates from a primary region to a secondary region. During a disaster event, when the primary region is not available, direct traffic to the secondary region for business continuity.

EDIFACT

Business continuity for EDI EDIFACT documents is based on control numbers.

Prerequisites

To enable disaster recovery for inbound messages, select the duplicate check settings in your EDIFACT agreement's Receive Settings.

Select duplicate check settings

  1. Create a logic app in a secondary region.

  2. Search on EDIFACT, and select EDIFACT - When a control number is modified.

    Search for EDIFACT

    The trigger prompts you to establish a connection to an integration account. The trigger should be connected to a primary region integration account.

  3. Enter a connection name, select your primary region integration account from the list, and choose Create.

    Primary region integration account name

  4. The DateTime to start control number sync setting is optional. The Frequency can be set to Day, Hour, Minute, or Second with an interval.

    DateTime and Frequency

  5. Select New step > Add an action.

    New step, Add an action

  6. Search on EDIFACT, and select EDIFACT - Add or update control numbers.

    Add or update control numbers

  7. To connect an action to a secondary region integration account, select Change connection > Add new connection for a list of the available integration accounts. Enter a connection name, select your secondary region integration account from the list, and choose Create.

    Secondary region integration account name

  8. Switch to raw inputs by clicking on the icon in upper right corner.

    Switch to raw inputs

  9. Select Body from the dynamic content picker, and save the logic app.

Dynamic content fields

Based on the time interval, the trigger polls the primary region received control number table and pulls the new records. The action updates the records to the secondary region integration account. If there are no updates, the trigger status appears as Skipped.

Control number table

Based on the time interval, the incremental runtime status replicates from a primary region to a secondary region. During a disaster event, when the primary region is not available, direct traffic to the secondary region for business continuity.

AS2

Business continuity for documents that use the AS2 protocol is based on the message ID and the MIC value.

Tip

You can also use the AS2 quick start template to create logic apps. Creating primary and secondary integration accounts are prerequisites to use the template. The template helps create a logic app that has a trigger and an action. The logic app creates a connection from a trigger to a primary integration account and an action to a secondary integration account.

  1. Create a logic app in the secondary region.

  2. Search on AS2, and select AS2 - When a MIC value is created.

    Search for AS2

    A trigger prompts you to establish a connection to an integration account. The trigger should be connected to a primary region integration account.

  3. Enter a connection name, select your primary region integration account from the list, and choose Create.

    Primary region integration account name

  4. The DateTime to start MIC value sync setting is optional. The Frequency can be set to Day, Hour, Minute, or Second with an interval.

    DateTime and Frequency

  5. Select New step > Add an action.

    New step, Add an action

  6. Search on AS2, and select AS2 - Add or update MIC contents.

    MIC addition or update

  7. To connect an action to a secondary integration account, select Change connection > Add new connection for a list of the available integration accounts. Enter a connection name, select your secondary region integration account from the list, and choose Create.

    Secondary region integration account name

  8. Switch to raw inputs by clicking on the icon in upper right corner.

    Switch to raw inputs

  9. Select Body from the dynamic content picker, and save the logic app.

    Dynamic content

    Based on the time interval, the trigger polls the primary region table and pulls the new records. The action updates them to the secondary region integration account. If there are no updates, the trigger status appears as Skipped.

    Primary region table

Based on the time interval, the incremental runtime status replicates from the primary region to the secondary region. During a disaster event, when the primary region is not available, direct traffic to the secondary region for business continuity.

Next steps

Monitor B2B messages