On the edit page of an instance, the "Add Item" button under network interfaces is in the disabled state. Since the button is visible, I guess this operation should be allowed in some way. Is it correct? How can I add a new interface to an existing instance?
Each instance must have a minimum of one network interface and a maximum of eight, depending on the instance's machine type.
Each instance can have up to 8 interfaces, depending on the instance's type.
Yes. You can assign one or more secondary private IP addresses to an Elastic Network Interface or an EC2 instance in Amazon VPC. The number of secondary private IP addresses you can assign depends on the instance type.
There is no way to add additional network interfaces after the instance has been created. This can only be done during instance creation, please take a look at the requirements for assigning multiple network interfaces
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