# How to connect and login into the Cirrus HPC and HTC clusters

## Public login services
* Access to the CNCA clusters is only available to registered users. 
* To use the HPC services users need to login via SSH into a front-end server.
* The login servers can be customized according to the user requirements (OS, Hardware resources, etc). 
* The login machines can be composed by a single server or multiple servers depending on the number of users. 

### CNCA-Lisbon (Cirrus-A) HPC and HTC
* Access to the CNCA advanced computing facilities in Lisbon is performed via the following login servers.

#### Almalinux Login server

```cirrus.a.acnca.pt ```

### CNCA-Vila Real (Cirrus-D) HPC and HTC
* Access to the CNCA advanced computing facilities in Vila Real is performed via the following login servers.

#### Almalinux 8 Login server

 * ```ui101.d.acnca.pt ```
 * ```ui102.d.acnca.pt ```