如何将范围设置为terraform schema.schema字段？

Question

I have a number_of_servers field in schema.schema and I need to set a range to it. Is there any way to do it?

Schema: map[string]*schema.Schema{
        "number_of_servers": {
            Type:     schema.TypeString,
            Required: true,
            Range: 1-5,
        },

Answer 1

Generally speaking validation functions are meant to validate any configs (possibly combined with variables). These run as part of terraform plan, terraform apply and terraform destroy. The user can also trigger explicit validation via terraform validate which is commonly used in CI.

Assuming that "Range" is meant to limit minimum & maximum number of characters in a given string you can use StringLenBetween from the validation package.

Schema: map[string]*schema.Schema{
    "number_of_servers": {
        Type:     schema.TypeString,
        Required: true,
        ValidateFunc: validation.StringLenBetween(1, 5),
    },

You can see it being used in practice here: https://github.com/terraform-providers/terraform-provider-aws/blob/46bff11/aws/resource_aws_cloudwatch_event_target.go#L71-L75