how to monitor azure internal load balancer correctly balancing the traffic between VM

Vikram Poojary 0

Deepanshukatara-6769 10,210 Reputation points

2024-11-05T13:17:56.8566667+00:00
Hello Vikram , Welcome to MS Q&A

To monitor an Azure internal load balancer and ensure it is correctly balancing the traffic between VMs, you can follow these steps:

Enable Load Balancer Diagnostics

Enable diagnostics for your load balancer to collect metrics and logs. This can be done through the Azure portal or using Azure CLI.

Using Azure Portal:

Navigate to your load balancer in the Azure portal.

Under the "Monitoring" section, select "Diagnostics settings."

Click on "Add diagnostic setting."

Select the metrics and logs you want to collect, such as "AllMetrics" and "LoadBalancerAlertEvent."

Choose a destination for the logs (e.g., Log Analytics workspace, Storage account, or Event Hub).

Save the settings.

Using Azure CLI:

az monitor diagnostic

Monitor Load Balancer Metrics

Azure Load Balancer provides several metrics that you can monitor to ensure it is correctly balancing traffic. Some key metrics include:

DipAvailability: The availability of the load balancer's data path.

ByteCount: The number of bytes processed by the load balancer.

PacketCount: The number of packets processed by the load balancer.

SNATConnectionCount: The number of SNAT connections used by the load balancer.

You can view these metrics in the Azure portal under the "Metrics" section of your load balancer.

Set Up Alerts

Set up alerts to notify you when certain conditions are met, such as high traffic or low availability.

Using Azure Portal:

Navigate to your load balancer in the Azure portal.

Under the "Monitoring" section, select "Alerts."

Click on "New alert rule."

Define the conditions for the alert (e.g., when DipAvailability is below 99%).

Set up the action group to notify you (e.g., email, SMS, webhook).

Save the alert rule.

Using Azure CLI:

az monitor metrics alert create \

Analyze Logs and Metrics

Use Azure Monitor and Log Analytics to analyze the collected logs and metrics. You can create custom queries to gain insights into the load balancer's performance and traffic distribution.

Example Log Analytics Query:

AzureDiagnostics |

By following these steps, you can effectively monitor your Azure internal load balancer and ensure it is correctly balancing the traffic between VMs.

References:

Monitor Load Balancer data with Azure Monitor

Azure Load Balancer metrics

Create, view, and manage log alerts using Azure Monitor

Please let us know if any questions

Kindly accept if it helps

Thanks

Deepanshu

Deepanshukatara-6769 10,210

First point command

az monitor diagnostic-settings create \
  --resource /subscriptions/{subscription-id}/resourceGroups/{resource-group}/providers/Microsoft.Network/loadBalancers/{load-balancer-name} \
  --name MyDiagnosticSetting \
  --logs '[{"category": "LoadBalancerAlertEvent", "enabled": true}]' \
  --metrics '[{"category": "AllMetrics", "enabled": true}]' \
  --workspace {log-analytics-workspace-id}

Third point command

az monitor metrics alert create \
  --name DipAvailabilityAlert \
  --resource /subscriptions/{subscription-id}/resourceGroups/{resource-group}/providers/Microsoft.Network/loadBalancers/{load-balancer-name} \
  --condition "avg DipAvailability < 99" \
  --description "Alert when DipAvailability is below 99%" \
  --action-group {action-group-id}

Fourth point command

AzureDiagnostics
| where ResourceType == "LOADBALANCERS"
| summarize count() by bin(TimeGenerated, 1h), dipAvailability_s
| render timechart

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