how to check backend server status in loadbalencer

Dhruva CHOUBEY 1 Reputation point
2021-03-16T15:31:51.067+00:00

How to check backend server status of servers or services which are configured in azure load balancer as backend pool . Want to check that backend servers are live or not .

Azure Load Balancer
Azure Load Balancer
An Azure service that delivers high availability and network performance to applications.
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  1. SUNOJ KUMAR YELURU 13,921 Reputation points MVP
    2021-03-16T22:38:18.877+00:00

    Hi @Dhruva CHOUBEY

    Thank you for posting in Q & A.

    The health probe status metric describes the health of your application deployment as configured by you when you configure the health probe of your load balancer. The load balancer uses the status of the health probe to determine where to send new flows. Health probes originate from an Azure infrastructure address and are visible within the guest OS of the VM.
    Troubleshoot Azure Load Balancer health probe status

    Are the Backend Instances for my Load Balancer responding to probes?

    Please don’t forget to Accept the answer and up-vote wherever the information provided helps you, this can be beneficial to other community members.

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  2. GitaraniSharma-MSFT 46,931 Reputation points Microsoft Employee
    2021-03-19T13:12:46.607+00:00

    Hello @Dhruva CHOUBEY ,

    Welcome to Microsoft Q&A Platform. Thank you for reaching out & hope you are doing well.

    There is no straightforward "Backend Health" option in Azure Load balancer as we do in Azure Application gateway. However, we do have various metrics in Standard load balancer to find out the resource health, health probe status and so on.

    Resource health : The Resource Health status of your Load Balancer is available in the Resource Health page under Monitor. The Resource Health Check (RHC) for the Load Balancer is used to determine the health of your load balancer. It analyzes the Data Path Availability metric over a 2-minute interval to determine whether the load balancing endpoints, the frontend IP and frontend ports combinations with load balancing rules, are available.

    Health probe status : Standard Load Balancer uses a distributed health-probing service that monitors your application endpoint's health according to your configuration settings. This metric provides an aggregate or per-endpoint filtered view of each instance endpoint in the load balancer pool.

    To configure load balancer metrics, please refer : https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-standard-diagnostics

    Post configuration of the metrics, if you face any issues or see a dip in the health probe status of the LB or the resource health reports it as unavailable, you may follow the below articles for troubleshooting:
    https://learn.microsoft.com/en-us/azure/load-balancer/troubleshoot-rhc
    https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-troubleshoot-health-probe-status

    NOTE : Metrics are available for Standard load balancer only. Basic SKU do not offer metrics.

    Kindly let us know if the above helps or you need further assistance on this issue.

    Please "Accept the answer" if the information helped you. This will help us and others in the community as well.

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