# Disaster Recovery

Disaster Recovery (DR), which is based on [REPLICATE DATABASE](https://docs.singlestore.com/db/v9.1/reference/sql-reference/operational-commands/replicate-database.md), can be enabled when running SingleStore on Kubernetes.

Users may declare a `replicationSpec` section to enable replication and DR. This is an optional section that can be added to the `sdb-cluster.yaml` file of the primary *and* secondary clusters to enable replication and DR between them, and to specify which connection model should be used.

```yaml
replicationSpec:
  enable: true
  connectivity: viaHost

```

To support replication and DR, either of the two following requirements must be met by the underlying infrastructure:

* Kubernetes hosts in primary and secondary clusters can reach each other via host IPs across clusters
* Kubernetes pods in primary and secondary clusters can reach each other via pod IPs across clusters

In addition, the following requirements must be met:

* SingleStore 7.1.3 or later must be deployed on both the primary and secondary clusters
* The primary and secondary clusters’ DDL endpoints are stable

Valid values for the fields in `replicationSpec` are:

* For the `enable` field: `true`, `false`

* For the `connectivity` field: `viaHost`, `viaPod`

  * Use `viaHost` when Kubernetes hosts in primary and secondary clusters can reach each other via host IPs across clusters
  * Use `viaPod` when Kubernetes pods in primary and secondary clusters can reach each other via pod IPs across clusters

Refer to [REPLICATE DATABASE](https://docs.singlestore.com/db/v9.1/reference/sql-reference/operational-commands/replicate-database.md) for more information.

***

Modified at: May 22, 2023

Source: [/db/v9.1/reference/singlestore-operator-reference/disaster-recovery/](https://docs.singlestore.com/db/v9.1/reference/singlestore-operator-reference/disaster-recovery/)

(An index of the documentation is available at /llms.txt)