Azure Service BUS Queue

Azure Service Bus Queue

Azure Service Bus is a fully managed enterprise messaging service that facilitates communication between decoupled applications and services. It enables reliable message queuing and publish-subscribe capabilities, ensuring seamless data flow and enhancing the scalability and resilience of applications.

Design Decisions

• Namespace & Queue Creation: The module creates an Azure Service Bus namespace and a queue within that namespace. The namespace is configured with SystemAssigned identity for integrated security.

• SKU Consideration: Differentiation is made between 'Premium' and other SKUs. For Premium SKUs, additional features like partitioning and zone redundancy are enabled or configurable.

• Security Roles: Specific roles like "Azure Service Bus Data Sender" and "Azure Service Bus Data Receiver" are created and scoped to the Service Bus namespace for access control.

• Monitoring & Alerts: Automated alarms for server errors and latency issues are configured, ensuring high availability and performance through predefined thresholds and alert conditions.

Runbook

Checking Namespace and Queue Status

To ensure your Service Bus namespace and queue are operational, you can check their statuses using Azure CLI commands.

# Check Namespace Status
az servicebus namespace show --resource-group <resource-group-name> --name <namespace-name> 

# Check Queue Status
az servicebus queue show --resource-group <resource-group-name> --namespace-name <namespace-name> --name <queue-name>

Viewing Active Messages

If messages are not being processed as expected, check the active messages in the queue.

az servicebus queue message count --resource-group <resource-group-name> --namespace-name <namespace-name> --queue-name <queue-name>

This command returns the count of messages in different states (active, dead-lettered, etc.) to help diagnose queuing issues.

Troubleshooting Network and Access Issues

If there are access problems, check the network rules and the assigned roles to ensure proper configuration.

# List Network Rules
az servicebus namespace network-rule list --resource-group <resource-group-name> --namespace-name <namespace-name> 

# Check Role Assignments
az role assignment list --scope <namespace-id>

Monitoring Service Health

Azure provides built-in monitoring via metrics and logs to track the health of your Service Bus namespace and queues.

# View Metrics for Namespace
az monitor metrics list --resource <namespace-id> --metric-names "Messages Count, ActiveMessages, DeadLetteredMessages"

# View Logs for Namespace
az monitor log-analytics query --workspace <workspace-id> --analytics-query "AzureDiagnostics | where ResourceId contains '<namespace-id>'"

Dealing with Message Duplication

If duplicate messages are being inserted, it might be due to the requires_duplicate_detection setting.

# Ensure Duplicate Detection is Enabled
az servicebus queue update --resource-group <resource-group-name> --namespace-name <namespace-name> --name <queue-name> --requires-duplicate-detection true

Remember to monitor the duplicate detection history to identify patterns and possible issues with message sending.