Assuming you have installed Apigee under /opt directory -
To start all the components-
/opt/apigee4/bin/all-start.sh
This is helpful if you have a “All in One” setup. If you have 5 or more host setup, then you will have to start these components individually on those machines.
Just to start the UI component, run the following command on the server where UI component is installed.
/opt/apigee4/etc/init.d/apigee-ui start
If you have following the 5-host installation, UI also runs on the management server.