github.com/vtorhonen/terraform@v0.9.0-beta2.0.20170307220345-5d894e4ffda7/website/source/docs/providers/aws/d/availability_zone.html.markdown (about)

     1  ---
     2  layout: "aws"
     3  page_title: "AWS: aws_availability_zone"
     4  sidebar_current: "docs-aws-datasource-availability-zone"
     5  description: |-
     6      Provides details about a specific availability zone
     7  ---
     8  
     9  # aws\_availability\_zone
    10  
    11  `aws_availability_zone` provides details about a specific availability zone (AZ)
    12  in the current region.
    13  
    14  This can be used both to validate an availability zone given in a variable
    15  and to split the AZ name into its component parts of an AWS region and an
    16  AZ identifier letter. The latter may be useful e.g. for implementing a
    17  consistent subnet numbering scheme across several regions by mapping both
    18  the region and the subnet letter to network numbers.
    19  
    20  This is different from the `aws_availability_zones` (plural) data source,
    21  which provides a list of the available zones.
    22  
    23  ## Example Usage
    24  
    25  The following example shows how this data source might be used to derive
    26  VPC and subnet CIDR prefixes systematically for an availability zone.
    27  
    28  ```
    29  variable "region_number" {
    30    # Arbitrary mapping of region name to number to use in
    31    # a VPC's CIDR prefix.
    32    default = {
    33      us-east-1      = 1
    34      us-west-1      = 2
    35      us-west-2      = 3
    36      eu-central-1   = 4
    37      ap-northeast-1 = 5
    38    }
    39  }
    40  
    41  variable "az_number" {
    42    # Assign a number to each AZ letter used in our configuration
    43    default = {
    44      a = 1
    45      b = 2
    46      c = 3
    47      d = 4
    48      e = 5
    49      f = 6
    50    }
    51  }
    52  
    53  # Retrieve the AZ where we want to create network resources
    54  # This must be in the region selected on the AWS provider.
    55  data "aws_availability_zone" "example" {
    56    name = "eu-central-1a"
    57  }
    58  
    59  # Create a VPC for the region associated with the AZ
    60  resource "aws_vpc" "example" {
    61    cidr_block = "${cidrsubnet("10.0.0.0/8", 4, var.region_number[data.aws_availability_zone.example.region])}"
    62  }
    63  
    64  # Create a subnet for the AZ within the regional VPC
    65  resource "aws_subnet" "example" {
    66    vpc_id     = "${aws_vpc.example.id}"
    67    cidr_block = "${cidrsubnet(aws_vpc.example.cidr_block, 4, var.az_number[data.aws_availability_zone.example.name_suffix])}"
    68  }
    69  ```
    70  
    71  ## Argument Reference
    72  
    73  The arguments of this data source act as filters for querying the available
    74  availability zones. The given filters must match exactly one availability
    75  zone whose data will be exported as attributes.
    76  
    77  * `name` - (Optional) The full name of the availability zone to select.
    78  
    79  * `state` - (Optional) A specific availability zone state to require. May
    80    be any of `"available"`, `"information"`, `"impaired"` or `"available"`.
    81  
    82  All reasonable uses of this data source will specify `name`, since `state`
    83  alone would match a single AZ only in a region that itself has only one AZ.
    84  
    85  ## Attributes Reference
    86  
    87  The following attributes are exported:
    88  
    89  * `name` - The name of the selected availability zone.
    90  
    91  * `region` - The region where the selected availability zone resides.
    92    This is always the region selected on the provider, since this data source
    93    searches only within that region.
    94  
    95  * `name_suffix` - The part of the AZ name that appears after the region name,
    96    uniquely identifying the AZ within its region.
    97  
    98  * `state` - The current state of the AZ.