What scenarios could occur as a result of changing the runlevel of the system?
What will be an ideal response?
When the runlevel is changed, init calls the rc script with the new runlevel as parameter (such as /etc/init.d/rc 3). The /etc/init.d/rc script examines the /etc/init.d/rccurrentrl.d/ and /etc/init.d/rcnewrl.d/ directories and determines what to do.
For example, suppose you change from runlevel 5 to runlevel 3. There are three possible scenarios that could occur as a result:
• There is a Kxx link for a certain service in /etc/init.d/rc5.d/ and there is an Sxx link in /etc/init.d/rc3.d/ for the same service. In this case, the service is neither started nor stopped because the service should run in both runlevels. Therefore, the service's script in /etc/init.d/ is not called at all.
• There is a Kxx link for a certain service in /etc/init.d/rc5.d/, but there is no corresponding Sxx link in /etc/init.d/rc3.d/. In this case, the script /etc/init.d/service is called with the stop parameter and the service is stopped.
• There is an Sxx link in /etc/init.d/rc3.d/ and there is no corresponding Kxx link for the service in /etc/init.d/rc5.d/. In this case, the script /etc/init.d/service is called with the start parameter and the service is started.
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