SYA710 Lab02

SYA710 Lab #2 (Incomplete - do not start)

Focus: Linux Startup

PART A (System V on Fedora 8):

Perform the following steps:

1. Login to Fedora 8 Test as root.
2. Type in this script. The name of this script should be called carpal.

#!/bin/sh
#
# carpal
#
# description: carpald is a program which wakes up every so often and 
#              tells us that we need to take a break from the keyboard 
#              or we'll lose all functinality of our wrists and never be 
#              able to type again as long as we live.
# chkconfig: 3 92 08

[ -f /usr/local/sbin/carpald ] || exit 0

# source function library
. /etc/rc.d/init.d/functions

case "$1" in 
  start) 
         echo -n "Starting carpald: "
         daemon /usr/local/sbin/carpald &
         echo
         touch /var/lock/subsys/carpald
         ;;
  stop)  
         echo -n "Stopping carpald services: "
         killproc /usr/local/sbin/carpald
         echo
         rm -f /var/lock/subsys/carpald
         ;;
  status) 
         status /usr/local/sbin/carpald
         ;;
  restart|reload)
         $0 stop
         $0 start
         ;;
  *)
         echo "Usage: carpal {start|stop|status|restart|reload}"
         exit 1
	 ;;
esac
exit 0

3. Save the script in /etc/init.d/ directory.
4. Now create another script named carpald - this script will be the daemon. Your carpald script can look something like this - but feel free to elaborate.

   #!/bin/sh
   #loop forever
   while :
   do        
       # now sleep for 30 seconds       
       sleep 30       
       # after wakeup send message to all users       
       wall <<EOF               
   Ok people! Time to take a break before               
   you get carpal tunnel syndrome!
   EOF
   done
   

5. Save your carpald script in directory /usr/local/sbin. Make sure the owner and permissions are set correctly.
6. Now run the command

   	
   chkconfig --add carpal
   

7. Now switch to runlevel 3 with the command

   	
   telinit 3
   

8. Login as joker and observe what happens.
9. Answer questions 1-14 in PART C and then do PART B.

PART B: (Upstart on Ubuntu 8.04)

Perform the following steps:

1. Login to UbuntuHH Test as root.
2. Answer the remaining questions in PART C and email your answers to your teacher.

PART C: - Questions

1. What is your full name and Seneca student ID?
2. What is the purpose of the wall command?
3. Identify the full path and names of ALL startup/shutdown links created in step 6.
4. What is the purpose of the chkconfig command?
5. What is the purpose of the /etc/init.d/functions script?
   
6. What is the difference between the init and telinit commands?
7. What runlevels does Fedora 8 use and what is the purpose of each?
8. What is the purpose of the daemon and killproc functions?
   
9. What common arguments do startup scripts take?
10. How is a daemon different from a regular user process?
11. Where (what directory other than /proc) are process numbers normally saved for currently running daemons.
12. What is the purpose of the dot (.) command and where is it used in this lab?
13. What is a lock file used for?
14. What is the full path name of the lock file used in this lab?