# Log in to the HSMs in an AWS CloudHSM cluster using KMU
<a name="key_mgmt_util-log-in"></a>

Use the **loginHSM** command in key\_mgmt\_util (KMU) to log in to the hardware security modules (HSM) in an AWS CloudHSM cluster. The following command logs in as a [crypto user (CU)](understanding-users-cmu.md) named `example_user`. The output indicates a successful login for all three HSMs in the cluster. 

```
Command:  loginHSM -u CU -s example_user -p {{<PASSWORD>}}
Cfm3LoginHSM returned: 0x00 : HSM Return: SUCCESS

Cluster Error Status
Node id 0 and err state 0x00000000 : HSM Return: SUCCESS
Node id 1 and err state 0x00000000 : HSM Return: SUCCESS
Node id 2 and err state 0x00000000 : HSM Return: SUCCESS
```

The following shows the syntax for the **loginHSM** command.

```
Command:  loginHSM -u {{<USER TYPE>}} -s {{<USERNAME>}} -p {{<PASSWORD>}}
```