You can create an instance with the gcloud command-line tool or with the Google Cloud Platform Console.
Use the gcloud spanner instances create command:
gcloud spanner instances create [INSTANCE-ID] --config=[INSTANCE-CONFIG] \
Provide the following values:
[INSTANCE-ID]: A permanent identifier that is unique within your Google Cloud Platform project. You cannot change the instance ID later.
[INSTANCE-CONFIG]: The instance configuration, which defines the geographic location of the instance's nodes and affects how data is replicated.
[INSTANCE-NAME]: The name to display for the instance in the GCP Console. The instance name must be unique within your Google Cloud Platform project.
[NODE-COUNT]: The number of nodes for the instance. The number of nodes determines the amount of serving and storage resources that are available to databases in the instance.
gcloud spanner instances create test-instance --config=regional-us-central1 \
--description="Test Instance" --nodes=1
You should see a message similar to the following example: