# Adding `TiCDC` to an Existing `TiDB` Cluster

+ Configure item **`cdc_servers`** in the `TiDB` cluster scale-out topology file, for example: **`scale-out.yaml`**  

```
~!@// File scale-out.yaml@!~

cdc_servers:
  - host: 10.0.0.153
    gc-ttl: 86400
    data_dir: /data/deploy/install/data/cdc-8300
  - host: 10.0.0.154
    gc-ttl: 86400
    data_dir: /data/deploy/install/data/cdc-8300
```
```
$ tiup cluster ~!@scale-out@!~ {cluster_name} scale-out.yaml
```
```
```
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[no notes]