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On September 30, 2025, Basic Load Balancer will be retired. For more information, see the official announcement. If you are currently using Basic Load Balancer, make sure to upgrade to Standard Load Balancer prior to the retirement date.

This article introduces a PowerShell module that creates a Standard Load Balancer with the same configuration as the Basic Load Balancer, then associates the Virtual Machine Scale Set or Virtual Machine backend pool members with the new Load Balancer.

Migrating internal Basic Load Balancers where the backend VMs or VMSS instances do not have Public IP Addresses requires additional steps for backend connectivity to the internet. Review How should I configure outbound traffic for my Load Balancer?

If the Virtual Machine Scale Set in the Load Balancer backend pool has Public IP Addresses in its network configuration, the Public IP Addresses associated with each Virtual Machine Scale Set instance will change when they are upgraded to Standard SKU. This is because scale set instance-level Public IP addresses cannot be upgraded, only replaced with a new Standard SKU Public IP. All other Public IP addresses will be retained through the migration.

If the Virtual Machine Scale Set behind the Load Balancer is a Service Fabric Cluster, migration with this script will take more time, is higher risk to your application, and will cause downtime. Review Service Fabric Cluster Load Balancer upgrade guidance for migration options.

One way to get a list of the Basic Load Balancers needing to be migrated in your environment is to use an Azure Resource Graph query. A simple query like this one will list all the Basic Load Balancers you have access to see.

''We have also written a more complex query which assesses the readiness of each Basic Load Balancer for migration on most of the criteria this module checks during validation. The Resource Graph query can be found in our GitHub project or opened in the Azure Resource Graph Explorer.

Yes, for both public and internal load balancers, the module ensures that front end IP addresses are maintained. For public IPs, the IP is converted to a static IP before migration. For internal front ends, the module attempts to reassign the same IP address freed up when the Basic Load Balancer was deleted. If the private IP isn't available the script fails (see What happens if my upgrade fails mid-migration?).

In a scenario where your backend pool members are also members of backend pools on another Load Balancer, such as when you have internal and external Load Balancers for the same application, the Basic Load Balancers need to be migrated at the same time. Trying to migrate the Load Balancers one at a time would attempt to mix Basic and Standard SKU resources, which is not allowed. The migration script supports this by passing multiple Basic Load Balancers into the same script execution using the -MultiLBConfig parameter.

At the end of its execution, the upgrade module performs the following validations, comparing the Basic Load Balancer to the new Standard Load Balancer. In a failed migration, this same operation can be called using the -validateCompletedMigration and -basicLoadBalancerStatePath parameters to determine the configuration state of the Standard Load Balancer (if one was created). The log file created during the migration also provides extensive detail on the migration operation and any errors.

For external Load Balancers, you can use Outbound Rules to explicitly enable outbound traffic for your pool members. If you have a single backend pool, we automatically configure an Outbound Rule for you during migration; if you have more than one backend pool, you will need to manually create your Outbound Rules to specify port allocations.

The module is designed to accommodate failures, either due to unhandled errors or unexpected script termination. The failure design is a 'fail forward' approach, where instead of attempting to move back to the Basic Load Balancer, you should correct the issue causing the failure (see the error output or log file), and retry the migration again, specifying the -FailedMigrationRetryFilePathLB -FailedMigrationRetryFilePathVMSS parameters. For public load balancers, because the Public IP Address SKU has been updated to Standard, moving the same IP back to a Basic Load Balancer won't be possible.

The end users who are accessing those devices have no idea that a server has failed. All they know is that the service remains available, and everything is working normally. Obviously, the primary function of a load balancer is to balance the load. And you can configure the load balancer to manage that load across multiple servers. You can also set up the load balancer so that some of the TCP overhead is offloaded onto the load balancer, rather than down to the individual server.

This load balancer might also provide caching services. It will keep a copy of very common responses. And when you make a request to one of these servers, and the load balancer already has that response in the cache, it can reply back to you on the internet without ever accessing any of the local servers.

There are also variants to this round-robin process. For example, a weighted round-robin might prioritize one server over another. So perhaps one of the servers would receive half of the available load. And the other servers would make up the rest of that load. With dynamic round-robin, the load balancer is keeping track of the load that is occurring across all of the servers. And when a request comes into the load balancer, it will send the next request to the server that has the lightest load.

If those same IP addresses and same port numbers are in use, then that communication will always go to one particular server. For example, our server here at the top will communicate to the load balancer. The load balancer will assign that session to server A. The second user communicating through that load balancer may be assigned to server B. If that first user then sends more information on that session through the load balancer, the load balancer will recognize that that is the same session from earlier and send that session down to server A.

The same thing will occur if the second user sends information in. The load balancer will recognize that that is an active session and sends that down to the server B, which was the original server used by that second user. Our load balancer might also be set up in an active/passive mode, where some of the servers are actively in use, and other servers are on a standby mode. This means if one of our active server fails, we have other devices that could suddenly move into an active mode and begin providing services through that load balancer.

Not all URL map features are available for all products. URL maps used withglobal external Application Load Balancers, regional external Application Load Balancers, internal Application Load Balancersand Cloud Service Mesh also support several advancedtraffic management features. For more information about these differences, seeLoad balancer feature comparison: Routing and trafficmanagement. Inaddition, regional URL maps can be a resource that's designated as a servicein App Hub, which is inpreview.

A backend service represents a collection of backends, which are instances of anapplication or microservice.A backend bucket is a Cloud Storagebucket, which is commonly used to hoststatic content, such as images.

If the load balancer receives a request with /../ in the URL, the loadbalancer transforms the URL by removing the path segment before the .., andresponds with the transformed URL. For example, when a request is sent for , the load balancer responds with a 302redirect to Most clients then react by issuing arequest to the URL returned by the load balancer (in this case, ). This 302 redirection isn't logged inCloud Logging.

Each URL map has a name. When you create an HTTP(S)-based load balancer by usingthe Google Cloud console, the URL map is assigned a name. This name is the same asthe name of the load balancer in the Google Cloud console. If you use theGoogle Cloud CLI or the API, you can define a custom name for the URL map.

A URL map is a set of Google Cloud configurationresources that direct requestsfor URLs to backend servicesor backend buckets. The URL map does so by using thehostname and path portions for each URL it processes:

Host rule (hostRules). A host rule directs requests sent to one or moreassociated hostnames to a single path matcher (pathMatchers). The hostnameportion of a URL is exactly matched against the set of the host rule'sconfigured hostnames. In a URL map host and path rule, if you omitthe host, the rule matches any requested host. To direct requests for to a path matcher, you need a single hostrule that at least includes the hostname example.net. That same hostrule could also handle requests for other hostnames, but it would directthem to the same path matcher.

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