# Using tags in AMS
<a name="ex-using-tags"></a>

**Topics**
+ [AMS infrastructure automatic tagging](ams-auto-tagging.md)
+ [AMS recommended tags](ams-tags.md)
+ [Tag bulk update notes](ams-tags-bu-notes.md)

Providing tags can be of great value. For in-depth information, read [Tagging Your Amazon EC2 Resources](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/Using_Tags.html).

RFCs that create instances, such as an Amazon S3 bucket or an AWS Elastic Load Balancer (ELB), generally provide a schema that enables you to add up to seven tags (key/value pairs); you can add more tags to your S3 bucket by submitting a Management \$1 Advanced stack components \$1 Amazon S3 storage \$1 Update CT. Amazon EC2, Amazon EFS, Amazon RDS, and the multi-tiered (HA Two-Tiered and HA One-Tiered) schemas allow up to fifty tags. Tags are specified in the ExecutionParameters part of the schema.

When using the AMS console, you must enable the **Additional configuration** view in order to add tags.

**Tip**  
Many CT schemas have a `Description` and `Name` field near the top of the schema. Those fields are used to name the stack or stack component, they do not name the resource you are creating. Some schemas offer a parameter to name the resource you are creating, and some do not. For example, the CT schema for Create Amazon EC2 stack does not offer a parameter to name the Amazon EC2 instance. In order to do so, you must create a tag with the key "Name" and the value of what you want the name to be. If you do not create such a tag, your Amazon EC2 instance displays in the Amazon EC2 console without a name attribute. 

Are there tag restrictions? Yes:
+ Tags are case sensitive.
+ The maximum key length is 128 Unicode characters.
+ The maximum value length is 256 Unicode characters.
+ The maximum number of tags per resource is 50.
+ The reserved prefix is `aws:`.
+ AWS-generated tag names and values are automatically assigned the `aws:` prefix, which you can't assign. User-defined tag names have the prefix `user:` in the cost allocation report.
+ Use each key only once for each resource. If you attempt to use the same key twice on the same resource, your request is rejected.
+ Allowed characters are Unicode letters, white space, numbers, and the following special characters: \$1 - = . \$1 : /

Which AWS resource types support tags? See [ Now Organize Your AWS Resources by Using up to 50 Tags per Resource](https://aws.amazon.com/blogs/security/now-organize-your-aws-resources-by-using-up-to-50-tags-per-resource/).