AWS launch a new instance: how to specify a specific region?

For example, We have a volume in us-west-1c. Need to launch a new instance in the same region to attach the volume. Launching an instance in us-west-1d will not work.

But in the instance launch page, there is no place to specify the region us-west-1c. From the top-right corner in the console page, only select region such as us-west-1 and could not select us-west-1c.

CodePudding user response：

us-west-1c is an availability zone [AZ], NOT a region. Each region is composed of 3 AZs.

For an EC2 instance, AZ is chosen when you choose a subnet on instance creation page. If you do not specify subnet, a random subnet is going to be used, and thus a random AZ.