Manage health probes for Azure Load Balancer using the Azure portal

Azure Load Balancer uses health probes to monitor the health of backend instances. In this article, you'll learn how to manage health probes for Azure Load Balancer.

There are three types of health probes:

Standard SKU Basic SKU
Probe types TCP, HTTP, HTTPS TCP, HTTP
Probe down behavior All probes down, all TCP flows continue. All probes down, all TCP flows expire.

Important

Load Balancer health probes originate from the IP address 168.63.129.16 and must not be blocked for probes to mark your instance as up. To see this probe traffic within your backend instance, review the Azure Load Balancer FAQ.

Regardless of configured time-out threshold, HTTP(S) load balancer health probes will automatically mark the instance as down if the server returns any status code that isn't HTTP 200 OK or if the connection is terminated via TCP reset.

Prerequisites

TCP health probe

In this section, you'll learn how to add and remove a TCP health probe. A public load balancer is used in the examples.

Add a TCP health probe

In this example, you'll create a TCP health probe to monitor port 80.

  1. Sign in to the Azure portal.

  2. In the search box at the top of the portal, enter Load balancer. Select Load balancers in the search results.

  3. Select myLoadBalancer or your load balancer.

  4. In the load balancer page, select Health probes in Settings.

  5. Select + Add in Health probes to add a probe.

    Screenshot of the health probes page for Azure Load Balancer

  6. Enter or select the following information in Add health probe.

    Setting Value
    Name Enter myHealthProbe.
    Protocol Select TCP.
    Port Enter the TCP port you wish to monitor. For this example, it's port 80.
    Interval Enter an interval between probe checks. For this example, it's the default of 5.
  7. Select Add.

Remove a TCP health probe

In this example, you'll remove a TCP health probe.

  1. Sign in to the Azure portal.

  2. In the search box at the top of the portal, enter Load balancer. Select Load balancers in the search results.

  3. Select myLoadBalancer or your load balancer.

  4. In the load balancer page, select Health probes in Settings.

  5. Select the three dots next to the rule you want to remove.

  6. Select Delete.

    Screenshot of TCP probe removal.

HTTP health probe

In this section, you'll learn how to add and remove an HTTP health probe. A public load balancer is used in the examples.

Add an HTTP health probe

In this example, you'll create an HTTP health probe.

  1. Sign in to the Azure portal.

  2. In the search box at the top of the portal, enter Load balancer. Select Load balancers in the search results.

  3. Select myLoadBalancer or your load balancer.

  4. In the load balancer page, select Health probes in Settings.

  5. Select + Add in Health probes to add a probe.

    Screenshot of the health probes page for Azure Load Balancer

  6. Enter or select the following information in Add health probe.

    Setting Value
    Name Enter myHealthProbe.
    Protocol Select HTTP.
    Port Enter the TCP port you wish to monitor. For this example, it's port 80.
    Path Enter a URI used for requesting health status. For this example, it's /.
    Interval Enter an interval between probe checks. For this example, it's the default of 5.
  7. Select Add.

Remove an HTTP health probe

In this example, you'll remove an HTTP health probe.

  1. Sign in to the Azure portal.

  2. In the search box at the top of the portal, enter Load balancer. Select Load balancers in the search results.

  3. Select myLoadBalancer or your load balancer.

  4. In the load balancer page, select Health probes in Settings.

  5. Select the three dots next to the rule you want to remove.

  6. Select Delete.

    Screenshot of HTTP probe removal.

HTTPS health probe

In this section, you'll learn how to add and remove an HTTPS health probe. A public load balancer is used in the examples.

Add an HTTPS health probe

In this example, you'll create an HTTPS health probe.

  1. Sign in to the Azure portal.

  2. In the search box at the top of the portal, enter Load balancer. Select Load balancers in the search results.

  3. Select myLoadBalancer or your load balancer.

  4. In the load balancer page, select Health probes in Settings.

  5. Select + Add in Health probes to add a probe.

    Screenshot of the health probes page for Azure Load Balancer

  6. Enter or select the following information in Add health probe.

    Setting Value
    Name Enter myHealthProbe.
    Protocol Select HTTPS.
    Port Enter the TCP port you wish to monitor. For this example, it's port 443.
    Path Enter a URI used for requesting health status. For this example, it's /.
    Interval Enter an interval between probe checks. For this example, it's the default of 5.
  7. Select Add.

Remove an HTTPS health probe

In this example, you'll remove an HTTPS health probe.

  1. Sign in to the Azure portal.

  2. In the search box at the top of the portal, enter Load balancer. Select Load balancers in the search results.

  3. Select myLoadBalancer or your load balancer.

  4. In the load balancer page, select Health probes in Settings.

  5. Select the three dots next to the rule you want to remove.

  6. Select Delete.

    Screenshot of HTTPS probe removal.

Next steps

In this article, you learned how to manage health probes for an Azure Load Balancer.

For more information about Azure Load Balancer, see: