链接：https://docs.oracle.com/en-us/iaas/Content/FreeTier/freetier_topic-Always_Free_Resources.htm
VM.Standard.E2.1.Micro shape (AMD):
Processor: 1/8th of an OCPU with the ability to use additional CPU resources
Memory: 1 GB
Networking: Includes one VNICwith one public IP address and up to 50 Mbps network bandwidth via the internet. Traffic to private IPs, on-premise endpoints via a Dynamic Routing Gateway, or to endpoints within the same Oracle Cloud region is up to 480 Mbps.
Image: Your choice of one of the following Always Free-eligible images:
Oracle Linux
Oracle Autonomous Linux
Ubuntu
CentOS
VM.Standard.A1.Flex shape (Arm-based Ampere A1 Compute): Because the VM.Standard.A1.Flex shape is a flexible shape, you can customize the number of OCPUs and amount of memory that are allocated when you create or resize an instance. You can use all of the Always Free OCPUs and memory to create a single instance, or create multiple smaller instances that each use a portion of the resources.
Processor: 4 OCPUs total, which you can allocate flexibly
Memory: 24 GB total, which you can allocate flexibly
Networking: The network bandwidth and number of VNICs scale proportionately with the number of OCPUs. For details, see Flexible Shapes.
Image: Your choice of one of the following Always Free-eligible images:
Oracle Linux Cloud Developer
Oracle Linux Cloud Developer provides the latest development tools, languages and Oracle Cloud Infrastructure software development kits (SDKs) to rapidly launch a comprehensive development environment. The Oracle Linux Cloud Developer image requires at least 8 GB of memory.
Oracle Linux
Ubuntu