An instance node management method, wherein the method is applied to a management device of a cloud platform, and the method comprises: creating a primary instance node for an application hosted on the cloud platform, wherein the primary instance node is configured to run an instance of the application; determining, according to running start information of the primary instance node, a minimum resource configuration specification required by a secondary instance node of the application, wherein the running start information indicates a basic resource required for running an instance of the application, the minimum resource configuration specification is used to indicate a minimum resource quantity that is required for starting or running the instance of the application, and the secondary instance node is configured to replace the primary instance node to run the instance of the application when the primary instance node is faulty; and creating the secondary instance node according to the minimum resource configuration specification, wherein a resource configuration specification of the secondary instance node is less than a resource configuration specification of the primary instance node, wherein the resource configuration specification of an instance node is used to indicate a resource quantity allocated to the instance node, and wherein after the creating the secondary instance node according to the minimum resource configuration specification, the method further comprises: when the primary instance node is faulty, adjusting the resource configuration specification of the secondary instance node to be the same as the resource configuration specification of the primary instance node, and setting the secondary instance node as a working instance node to replace the primary instance node to run the instance of the application. creating a primary instance node for an application hosted on the cloud platform, wherein the primary instance node is configured to run an instance of the application; determining, according to running start information of the primary instance node, a minimum resource configuration specification required by a secondary instance node of the application, wherein the running start information indicates a basic resource required for running an instance of the application, the minimum resource configuration specification is used to indicate a minimum resource quantity that is required for starting or running the instance of the application, and the secondary instance node is configured to replace the primary instance node to run the instance of the application when the primary instance node is faulty; and creating the secondary instance node according to the minimum resource configuration specification, wherein a resource configuration specification of the secondary instance node is less than a resource configuration specification of the primary instance node, wherein the resource configuration specification of an instance node is used to indicate a resource quantity allocated to the instance node, and wherein after the creating the secondary instance node according to the minimum resource configuration specification, the method further comprises: when the primary instance node is faulty, adjusting the resource configuration specification of the secondary instance node to be the same as the resource configuration specification of the primary instance node, and setting the secondary instance node as a working instance node to replace the primary instance node to run the instance of the application.