Starting and Stopping NiFi on Linux

Once you have downloaded and installed NiFi, you can start it by using the command appropriate for how you want to interact with NiFi. You can start NiFi in the foreground, background, or as a service.

Starting NiFi in the foreground:

Starting NiFi in the foreground will leave the application running until you press Ctrl-C. At that time, it will initiate shutdown of the application.

From a terminal window, navigate to the NiFi installation directory.
Enter:
```
bin/nifi.sh run
```

Starting NiFi in the background:

If you start NiFi in the background, to check the status and see if NiFi is currently running, execute the command /bin/nifi.sh status. To shut down NiFi, execute the command bin/nifi.sh stop.

From a terminal window, navigate to the NiFi installation directory.
Enter:
```
bin/nifi.sh start
```

Starting NiFi as a service:

Once installed, you can start and stop the NiFi service by using the appropriate commands, such as sudo service nifi start and sudo service nifi stop. Additionally, you can check the running status with sudo service nifi status.

From a terminal window, enter:
```
sudo service nifi start
```

Results

When NiFi first starts up, the following directories are created:

content_repository
database_repository
flowfile_repository
provenance_repository
work directory
logs directory
Within the conf directory, the flow.xml.gz file is created

flow_storage
database
work
logs
run