How to reset a Linux device

Use this procedure to reregister a Carbon Black Cloud Linux Sensor.

Prerequisites

This task requres the use of RepCLI. If you are unfamiliar with this tool, please see: Manage Linux Sensors by using RepCLI.

The following requiremments must be met before performing this task:

Carbon Black Cloud Sensor must be version 2.1.0.149 or higher.
Linux: All Linux versions supported by Carbon Black Cloud.
For a list of supported versions, see the Linux Sensor OER.

In addition, you should confirm the registration status of the sensor before performing this task. Use any of the following methods:

Use the following terminal command to provide the current registration ID:
```
sudo ./repcli registrationid
```
Use the following terminal command to provide both the current and previous registration IDs:
```
grep RegistrationId /var/opt/carbonblack/psc/cfg.ini
```

Open a terminal command window.
Create a backup of the cfg.ini file.
Stop the cbagentd service.
- For distributions using SystemD (for example: CentOS 7), run the Terminal command below:
```
sudo systemctl stop cbagentd
```
- For older distributions using SystemV (for example: CentOS 6), run the Terminal command below:
```
sudo service cbagentd stop
```
Run the following command to reregister the Linux sensor:
```
sudo /opt/carbonblack/psc/bin/cbagentd -r
```
Start the cbagentd service.
- For distributions using SystemD (for example: CentOS 7), run the Terminal command below.
```
sudo systemctl start cbagentd
```
- For older distributions using SystemV (for example: CentOS 6), run the Terminal command below.
```
sudo service cbagentd start
```
Verify the RegistrationId after reregistration to ensure the sensor is registered:
```
grep RegistrationId /var/opt/carbonblack/psc/cfg.ini
```
After verifying the sensor reregistration, delete the backup config.ini that you created in step 2.