# Tags

> Cloud Management Platform (CMP) manages tags on your servers by linking them to CMP server attributes

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Site [llms.txt](/llms.txt)

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When the value of a linked attribute changes, CMP updates the tag's value to match.

## Supported platforms

CMP manages tags on the following resource handlers:

- Alibaba (Aliyun)
- AWS
- Azure Resource Manager
- Azure Local
- GCP
- Nutanix Acropolis (API v4.0)
- OCI (Oracle Cloud Infrastructure)
- OpenStack
- Outscale
- oVirt
- SCVMM
- VMware vSphere

## How to use tags

A common use case is managing an AWS cost center tag. Suppose you want every server provisioned by your Dev group to have the Cost Center tag set to 1:

1. Create a **Cost Center** parameter. Check **Show on objects** so it can be linked to a tag.
1. Add the parameter to the Dev group with `1` as its only option, so every server the group provisions uses that value.
1. On the resource handler's **Tags** tab, add a tag. Select **Cost Center (cost_center)** as the **Parameter**, and enter **Cost Center** as the **Tag Name**.

Now whenever the Dev group provisions a server, CMP sets both the Cost Center parameter and the tag to 1.

## Bidirectional syncing

CMP creates tags on the server at provision time, and you can also update them at any time. When you edit a parameter on a server in CMP, CMP writes the new value to the linked tag.

CMP also detects changes made to tags on the resource handler. When you run the **Refresh Info** server action, CMP updates the server's **Tags** and **Parameters** sections for any parameters linked to tags.

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Syncing from remote tags is enabled by default only for parameters, not for built-in server attributes such as owner, environment, or group. To enable bidirectional syncing on group and owner tags, select **Bidirectional** in the **Syncing** column of the resource handler's **Tags** table.
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## View and edit tags

Tags on a CMP server appear on a server's **Details** tab, in the platform-specific details pane. For example, the pane is labeled **Azure Details** for an Azure server.

For tags linked to parameters, you can view and edit the values on the **Parameters** tab of the server's details page. To change a tag value, select the **Edit** icon in the **Value** column for the linked parameter. When you save, a parameter change hook updates the tag's value in the associated cloud (for example, VMware, Azure, or AWS), and a dialog confirms the change.

## Unlink tags

To stop linking a tag to a parameter, delete the link from the resource handler's **Tags** tab. Existing servers keep the tag, but changing the parameter value no longer updates it.