A load balancer routes requests it receives from clients to the WebLogic Servers configured in a service instance.
Using a load balancer within your service instance is recommended if you are configuring more than one Managed Server or more than one cluster. A load balancer also gives you the ability to suspend access to a service instance temporarily to perform routine maintenance.
Oracle SOA Cloud Service in Oracle Cloud Infrastructure supports two load balancer options:
A user-managed load balancer that runs within your service instance. You can access, patch, and administer this type of load balancer like other nodes in your service instance. This load balancer is an instance of Oracle Traffic Director (OTD) and is administered through the Load Balancer Console. A service instance can include zero or one nodes running OTD. Each load balancer node is assigned a separate public IP address.
An Oracle-managed load balancer that is automatically patched and maintained by Oracle. This load balancer can be configured after provisioning your Oracle SOA Cloud Service instance in the region where the service instance is created. See Configure an Oracle Cloud Infrastructure Load Balancer Post-Provisioning.
The Oracle-managed Oracle Cloud Infrastructure load balancer is automatically deployed on multiple nodes to provide high availability and is accessed by clients using a single public IP address. The configuration options vary by region:
You can assign a subnet to each load balancer node. For high availability, Oracle recommends that each subnet be associated with a different availability domain in the selected region. If the selected region has one availability domain, you can specify only one subnet, which is assigned to both load balancer nodes.
You can choose to create a public or private Oracle-managed load balancer. A private load balancer cannot be accessed from the public Internet. It is for use cases where you only intend to access your service instance from within your private cloud network or from your on-premises data center over a VPN network.