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8.1 KiB
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---
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title: About the aws_elbs Resource
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platform: aws
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---
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# aws\_elbs
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Use the `aws_elbs` InSpec audit resource to test properties of AWS Elastic Load Balancers (ELBs, also known as a Classic Load Balancers) in bulk, or to search for a group of them based on their properties.
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To audit a specific ELB in detail when its name is known, use `aws_elb` (singular).
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<br>
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## Availability
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### Installation
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This resource is distributed along with InSpec itself. You can use it automatically.
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### Version
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This resource first became available in v2.2.10 of InSpec.
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## Syntax
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An `aws_elb` resource block uses an optional filter to select a group of ELBs and then tests that group.
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# Check that you have at aleast one ELB
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describe aws_elbs do
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it { should exist }
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end
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# Ensure that you have at least one ELB in a specific VPC
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describe aws_elb.where(vpc_id: 'vpc-12345678') do
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it { should exist }
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end
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<br>
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## Filter Criteria
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Use filter criteria with `where` to search for ELBs by their properties. `where` may be used in method mode (as in `aws_elbs.where(criterion: value)`) or in block mode (as in `aws_elbs.where { any code here }`). Several criteria on this resource may only be used with block-mode, because they are list-based.
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### availability\_zones
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An array of strings identifying which availability zones in which the load balancer is located. This criterion must be used with block-mode `where`.
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# Find ELBs with a footprint in us-east-2a
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describe aws_elbs.where { availability_zones.include? 'us-east-2a' } do
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it { should exist }
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end
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### dns\_name
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Returns the FQDN of the load balancer. This is the hostname which is exposed to the world.
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# Find ELBs that have the letter z in their DNS name
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describe aws_elbs.where(dns_name: /z/) do
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it { should exist }
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end
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### elb\_name
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The name of the ELB within AWS. The ELB name is unique within the region. If you know the full ELB name, you should use the `aws_elb` resource instead, as it is much more efficient for testing a specific ELB.
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# Find ELBs whose name ends in `prod`
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describe aws_elbs.where(elb_name: /prod$/) do
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it { should exist }
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end
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### external\_ports
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An array of integers reflecting the public-facing ports on which the load balancer will be listening for traffic. This criterion must be used with block-mode `where`.
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# Find ELBs listening on port 80
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describe aws_elbs.where { external_ports.include? 80 } do
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it { should exist }
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end
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### instance\_ids
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An array of strings reflecting the instance IDs of the EC2 instances attached to the ELB. This criterion must be used with block-mode `where`.
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# Find ELBs with at least 3 instances
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describe aws_elbs.where { instance_ids.count > 2 } do
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it { should exist }
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end
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### internal\_ports
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An array of integers reflecting the EC2-facing ports on which the load balancer will be sending traffic to. This criterion must be used with block-mode `where`.
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# Find ELBs sending traffic to port 80
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describe aws_elbs.where { internal_ports.include? 80 } do
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it { should exist }
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end
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### security\_group\_ids
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An array of strings reflecting the security group IDs (firewall rule sets) assigned to the ELB. This criterion must be used with block-mode `where`.
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# Find ELBs using a particular security group
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describe aws_elbs.where { security_group_ids.include? 'sg-12345678' } do
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it { should exist }
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end
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### subnet\_ids
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An array of strings reflecting the subnet IDs on which the ELB is located. This criterion must be used with block-mode `where`.
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# Find ELBs located on a particular subnet
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describe aws_elbs.where { subnet_ids.include? 'subnet-12345678' } do
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it { should exist }
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end
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### vpc\_id
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A String reflecting the ID of the VPC in which the ELB is located.
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# Find all ELBs in a specific VPC.
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describe aws_elbs.where(vpc_id: 'vpc-12345678') do
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it { should exist }
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end
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<br>
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## Properties
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### availability\_zones
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An array of strings identifying which availability zones in which the selected load balancers are located. The array is de-duplicated.
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# Ensure none of our ELBs are in us-east-1c
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describe aws_elbs do
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its('availability_zones') { should_not include 'us-east-1c' }
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end
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### count
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Returns an integer reflecting the number of matched ELBs.
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# Ensure we have 4 ELBs total.
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describe aws_elbs do
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its('count') { should cmp 4 }
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end
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### dns\_names
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An array of FQDNs of the selected load balancers. These are the hostnames which are exposed to the world.
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# Ensure none of the DNS names are an old name
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describe aws_elbs do
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its('dns_names') { should_not include 'some.horrid.name' }
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end
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### elb\_names
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The names of the selected ELBs within AWS. The ELB name is unique within the region.
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# You can use this to enumerate the ELBs for detailed tests
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# Search using the plural, analyze using the singular.
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aws_elbs.where { instance_ports.include? 80 }.elb_names.each do |elb_name|
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describe aws_elb(elb_name) do
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its('security_group_ids') { should include 'sg-12345678' }
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end
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end
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### external\_ports
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An array of integers reflecting the public-facing ports on which the selected load balancers will be listening for traffic. The array is de-duplicated.
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# Ensure that the only ports we are listening on are 80 and 443
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describe aws_elbs do
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its('external_ports') { should include 80 }
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its('external_ports') { should include 443 }
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its('external_ports.count') { should cmp 2 }
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end
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### instance\_ids
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An array of strings reflecting the instance IDs of the EC2 instances attached to the selected ELBs.
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# Ensure there are 10-20 instances total attached to all ELBs
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describe aws_elbs do
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its('instance_ids.count') { should be >= 10 }
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its('instance_ids.count') { should be <= 20 }
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end
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### internal\_ports
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An array of integers reflecting the EC2-facing ports on which the selected load balancers will be sending traffic to. The array is de-duplicated.
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# Ensure all ELBs only talk to port 80
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describe aws_elbs do
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its('internal_ports') { should contain 80 }
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its('internal_ports.count') { should cmp 1 }
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end
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### security\_group\_ids
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An array of strings reflecting the security group IDs (firewall rule sets) assigned to the selected ELBs. The array is de-duplicated.
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# Ensure all ELBs are using one specific security group
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describe aws_elbs do
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its('security_group_ids') { should include 'sg-12345678' }
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its('security_group_ids.count') { should cmp 1 }
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end
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### subnet\_ids
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An array of strings reflecting the subnet IDs on which the selected ELBs are located. The array is de-duplicated.
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# Ensure all ELBs are on a particular subnet
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describe aws_elbs do
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its('subnet_ids') { should include 'subnet-12345678' }
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its('subnet_ids.count') { should cmp 1 }
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end
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### vpc\_ids
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An array of strings reflecting the ID of the VPCs in which the selected ELBs are located. The array is de-duplicated.
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# Ensure all ELBs are in one VPC
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describe aws_elbs do
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its('vpc_ids.count') { should cmp 1 }
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end
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## Matchers
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This InSpec audit resource has the following resource-specific matchers. For a full list of available matchers, please visit our [Universal Matchers page](https://www.inspec.io/docs/reference/matchers/).
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### exists
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The audit test will pass if at least one ELB was matched by the filter. Use with `should_not` to test for absence.
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# We like z's in our DNS names
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describe aws_elbs.where(dns_name: /z/) do
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it { should exist }
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end
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# But k's are just awful
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describe aws_elbs.where(dns_name: /k/) do
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it { should_not exist }
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end
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## AWS Permissions
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Your [Principal](https://docs.aws.amazon.com/IAM/latest/UserGuide/intro-structure.html#intro-structure-principal) will need the `elasticloadbalancing:DescribeLoadBalancers` action set to Allow.
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You can find detailed documentation at [Authentication and Access Control for Your Load Balancers](https://docs.aws.amazon.com/elasticloadbalancing/latest/userguide/load-balancer-authentication-access-control.html) |