# Discovery requirements

Discovery has the following operating system, software, and network requirements.

## Discovery host

Discovery 8 requires a host with the following specification:

* Operating system:
  * Red Hat Enterprise Linux 9 (x86_64, aarch64) [recommended]
  * Red Hat Enterprise Linux 8 (x86_64)
  * Red Hat Enterprise Linux 7 (x86_64)^{asterisk}^

    ^{asterisk}^ Red Hat Extended Life Cycle Support subscription required from 30th June 2024
* OpenJDK 17
* Fixed IP address or hostname
* Open network ports:
  * HTTP: 4567
  * Discovery server: 5701

Do not expose any of the network ports above to the Internet.

We recommend that a production Caplin Platform deployment include a cluster of two Discovery servers. Do not load balance connections to a Discovery cluster -- allow DataSource clients free access to connect to both nodes.

## DataSource clients

The following DataSource servers, adapters, and libraries are compatible with Discovery:

**Caplin DataSource servers**

|  | Minimum version |
| --- | --- |
| [Liberator](../liberator/index.md) | 8.0.0 |
| [Transformer](../transformer/index.md) | 8.0.0 |

**Caplin DataSource libraries**

|  | Minimum version |
| --- | --- |
| DataSource Java | 8.0.0 |
| DataSource C (DSDK) | 8.0.0 |
| DataSource .NET | 8.0.0 |

DataSource client recommendations:

* Do not enable [DataSource peer thread pooling](../datasource/datasource-configure-threads-for-peer-communication.md).