---
title: Creating a Replication Rule
weight: 25
---
A replication endpoint must exist before you create a replication rule. To create an endpoint, follow the instructions in [Creating Replication Endpoints](create-replication-endpoints.md).
1. Log in to the Harbor interface with an account that has Harbor system administrator privileges.
1. Expand **Administration**, and select **Replications**.
1. Click **New Replication Rule**.
1. Provide a name and description for the replication rule.
1. Select **Push-based** or **Pull-based** replication, depending on whether you want to replicate images to or from the remote registry.
1. For **Source resource filter**, identify the images to replicate.
* **Name**: Replicate resources with a given name by entering an image name or fragment.
* **Tag**: Replicate resources with a given tag by entering a tag name or fragment.
* **Label**: Replicate resources with a given label by using the drop-down menu to select from the available labels.
* **Resource**: Replicate images, charts, or both.
The name filter and tag filters support the following patterns:
* **\***: Matches any sequence of non-separator characters `/`.
* **\*\***: Matches any sequence of characters, including path separators `/`.
* **?**: Matches any single non-separator character `/`.
* **{alt1,...}**: Matches a sequence of characters if one of the comma-separated alternatives matches. are as follows:
* **\***: Matches any sequence of non-separator characters `/`.
* **\*\***: Matches any sequence of characters, including path separators `/`.
* **?**: Matches any single non-separator character `/`.
* **{alt1,...}**: Matches a sequence of characters if one of the comma-separated alternatives matches.
**NOTE:** You must add `library` if you want to replicate the official images of Docker Hub. For example, `library/hello-world` matches the official hello-world images.
Pattern | String(Match or not)
---------- | -------
`library/*` | `library/hello-world`(Y)<br> `library/my/hello-world`(N)
`library/**` | `library/hello-world`(Y)<br> `library/my/hello-world`(Y)
`{library,goharbor}/**` | `library/hello-world`(Y)<br> `goharbor/harbor-core`(Y)<br> `google/hello-world`(N)
`1.?` | `1.0`(Y)<br> `1.01`(N)
1. Use the **Destination Registry** drop-down menu to select from the configured replication endpoints.
1. Enter the name of the namespace in which to replicate resources in the **Destination namespace** text box.
If you do not enter a namespace, resources are placed in the same namespace as in the source registry.
1. Use the Trigger Mode drop-down menu to select how and when to run the rule.
* **Manual**: Replicate the resources manually when needed. **Note**: Deletion operations are not replicated.
* **Scheduled**: Replicate the resources periodically by defining a cron job. **Note**: Deletion operations are not replicated.
* **Event Based**: When a new resource is pushed to the project, or an image is retagged, it is replicated to the remote registry immediately. If you select the **Delete remote resources when locally deleted**, if you delete an image, it is automatically deleted from the replication target.
{{< note >}}
You can filter images for replication based on the labels that are applied to the images. However, changing a label on an image does not trigger replication. Event-based replication is limited to pushing, retagging, and deleting images.
{{< /note >}}
1. Optionally select the Override checkbox to force replicated resources to replace resources at the destination with the same name.
1. Click **Save** to create the replication rule.
## What to Do Next
After you create a replication rule, see [Running Replication Manually](manage-replications.md).