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Showing content from https://docs.aws.amazon.com/elasticloadbalancing/latest/network/load-balancer-tags.html below:

Tag a Network Load Balancer

Tags help you to categorize your Network Load Balancers in different ways. For example, you can tag a resource by purpose, owner, or environment.

You can add multiple tags to each Network Load Balancer. If you add a tag with a key that is already associated with the Network Load Balancer, it updates the value of that tag.

When you are finished with a tag, you can remove it from your Network Load Balancer.

• Maximum number of tags per resource—50

• Maximum key length—127 Unicode characters

• Maximum value length—255 Unicode characters

• Tag keys and values are case-sensitive. Allowed characters are letters, spaces, and numbers representable in UTF-8, plus the following special characters: + - = . _ : / @. Do not use leading or trailing spaces.

• Do not use the aws: prefix in your tag names or values because it is reserved for AWS use. You can't edit or delete tag names or values with this prefix. Tags with this prefix do not count against your tags per resource limit.

Console

To update the tags for a load balancer

1. Open the Amazon EC2 console at https://console.aws.amazon.com/ec2/.

2. In the navigation pane, choose Load Balancers.

3. Select the check box for the Network Load Balancer.

4. On the Tags tab, choose Manage tags.

5. To add a tag, choose Add tag and enter the tag key and tag value. Allowed characters are letters, spaces, numbers (in UTF-8), and the following special characters: + - = . _ : / @. Do not use leading or trailing spaces. Tag values are case-sensitive.

6. To update a tag, enter new values in Key or Value.

7. To delete a tag, choose Remove next to the tag.

8. Choose Save changes.

AWS CLI

To add tags

Use the add-tags command. The following example adds two tags.

aws elbv2 add-tags \
    --resource-arns load-balancer-arn \
    --tags "Key=project,Value=lima" "Key=department,Value=digital-media"

To remove tags

Use the remove-tags command. The following example removes the tags with the specified keys.

aws elbv2 remove-tags \
    --resource-arns load-balancer-arn \
    --tag-keys project department

CloudFormation

To add tags

Define a resource of type AWS::ElasticLoadBalancingV2::LoadBalancer resource to include the Tags property.

Resources:
  myLoadBalancer:
    Type: 'AWS::ElasticLoadBalancingV2::LoadBalancer'
    Properties:
      Name: my-nlb
      Type: network
      Scheme: internal
      Subnets: 
        - !Ref subnet-AZ1
        - !Ref subnet-AZ2
      SecurityGroups: 
        - !Ref mySecurityGroup
      Tags:  
        - Key: 'project'
          Value: 'lima'
        - Key: 'department'
          Value: 'digital-media'

Update the security groups

Delete a load balancer

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