Standalone System

You can shut down the existing SDM software version running on your system to install a new version of the software, restore a database or apply a software patch.

Log in as the nncentral user.
Change directory to the bin directory.
For example:
```
cd /home/nncentral/AcmePacket/NNC<version>/bin
```
Execute the shutdownnnc.sh script. By default, the shutdownnnc.sh script detects whether the existing installation is a standalone or clustered system and prompts you with the option to shut down the entire cluster if no flag options are provided.
Note:
However, You can script an option ahead of time by adding -local for single nodes and -cluster to shutdown an entire cluster.
```
./shutdownnnc.sh
Shutdown back-end server
Do you wish to shut down the entire cluster (Yes/No)? Yes
```