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Dedicated Load Balancers

CloudHub dedicated load balancers (DLBs) are an optional component of Anypoint Platform that enable you to route external HTTP and HTTPS traffic to multiple Mule applications deployed to CloudHub workers in a Virtual Private Cloud (VPC).

Dedicated load balancers enable you to:

  • Handle load balancing among the different CloudHub workers that run your application.

  • Define SSL configurations to provide custom certificates and optionally enforce two-way SSL client authentication.

  • Configure proxy rules that map your applications to custom domains.

    This enables you to host your applications under a single domain.

To use a dedicated load balancer in your environment, you must first create an Anypoint VPC. Because you can associate multiple environments with the same Anypoint VPC, you can use the same dedicated load balancer for your different environments.

You can view the load balancer and Anypoint VPC endpoints in your Anypoint Platform organization from the API portal.

Create and Configure a Dedicated Load Balancer

To create and configure a load balancer, you must be an administrator of the organization to which the load balancer is associated.

DLB names must be unique across all DLBs defined in Anypoint Platform (by all MuleSoft customers).

There are three ways to create and configure a dedicated load balancer for your Anypoint VPC:

For a full description of loadbalancers and vpcs endpoints, see the CloudHub API.

Dedicated Load Balancer Licensing

Each DLB unit that you purchase is the equivalent of two workers handling load balancing between CloudHub workers. You can assign up to four load balancer units to a DLB. A DLB with four load balancer units assigned has eight workers.

Static IP Addresses

If you enable static IP addresses for a DLB, the number of static IP addresses allocated to the DLB is equal to double the number of workers. For example, if your DLB has four workers, the DLB has eight associated static IP addresses.

Half the static IPs (equal to the number of worker instances) are in use at any given time. When you restart or update the DLB, the DLB switches to use the group of unused static IP addresses and transitions the first group of static IP addresses to the unused state.

Switching between the two groups of static IP addresses enables zero-downtime restarts and updates, ensuring that no transactions are dropped or lost as long as the transaction times are shorter than 600 seconds or the value of Mule Application Response Timeout (whichever is smaller).

Considerations

  • Because static IPs change when you restart or update your DLB, use the DLB’s DNS address rather than the IP addresses when calling the DLB from an external service. Ensure that the client includes the necessary retry mechanisms to account for the DNS switch.

  • To avoid connection issues when the load balancer is restarting, adhere to the DNS TTL (30 seconds), including connection keep alive. The connections are closed after the new workers are online and the TTL expires.

For DLBs created before October 2021, click Update to enable the feature. After clicking Update, the DLB uses the static IP model described earlier, and you cannot revert to the former model.

For information about updating DLBs, see Dedicated Load Balancer Updates.

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