Docs › Secure Factory Service › Setting up a root of factories CA › Signing the factory CA CSR

Signing the factory CA CSR

Run the start command.
```
./rof start
```
The root of factories tool prompts you to enter your username and password.
You can check the root of factories service status using the status command.
To sign a certificate signing request:
```
./rof sign csr.pem
```
You can pass the -o or --output argument to write the CSR to a file with a specific name.

The root of factories tool prompts you to enter your username and password.
Stop root of factories services:
```
./rof stop
```