# Restrict RDS instance size

1. From the DuploCloud Portal, navigate to **Administrator** -> **Systems Settings**.
2. Select the **System Config** tab, and click **Add**. The **Update Config AppConfig** pane displays.<br>

   <div align="left"><figure><img src="https://2471407984-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F68cb0s9ce5UIUKWPuYs8%2Fuploads%2FW3UFksqjGkTtknbL7Xtf%2FRDS%20size%20limit%20image.png?alt=media&#x26;token=08891faf-3599-49b5-a8a8-480fa1b4011b" alt="" width="375"><figcaption><p>The <strong>Update Config AppConfig</strong> pane  </p></figcaption></figure></div>
3. In the **Config Type** list box, select **AppConfig**.
4. From the **Key** list box, select **RDS allowed max instance size**.
5. From the **Value** list box, select the maximum instance size.&#x20;
6. Click **Submit**. RDS instances will be limited to the maximum instance size configured.<br>