Client-specified network interface configuration for serverless container management service

The present application relates to providing a mechanism for specifying multiple network interfaces to be configured for on-demand compute capacity and for obtaining the credentials needed to configure the multiple network interfaces. For example, a container orchestration service may specify, in its code execution request to a serverless container management service, that multiple network interfaces are needed for the requested compute capacity. In response, the serverless container management service can identify the multiple network interfaces, determine the credential to be used to configure each of the multiple network interfaces, and attach the multiple network interfaces to the compute capacity acquired on behalf of the container orchestration service. During execution, the code running inside the compute capacity can utilize the multiple network interfaces as specified by the owner of the code.