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Sys-Admin Section 4

Choose a game to study Section 4 Keypoints!

QuestionAnswer
What is the traditional start-up order? POST/Hardware, kernel/drivers loaded, OS loaded, Disk mounts, OS services and applications, (databases 1st, messaging/OLTP, apps/webservers
what does the who -r command show? current run level
what is one way to show current runlevel besides the who -r command? runlevel
what is runlevel 0? Halt
What is runlevel 1? Single user mode
What is runlevel 2? not used - user-definable
What is runlevel 3? Full multiuser mode - command prompt
What is runlevel 4? Not used - user definable
What is runlevel 5? Full multi-user mode with an X-based login screen (windows, GUI)
What is runlevel 6? Reboot
What is /etc/inittab Initialization file - where you can change runlevel (initdefault)
What does /ect/init.d conatin? startup scripts
What does /etc/init.d/rc#.d conatin? links to /etc/init.d scripts that begin with either a K or an S
What does the K and S stand for in the links found in /etc/init.d? K = kill script, S = startup script
What shutdown command will turn your computer completely off immediately? shutdown -h 0
What shutdown command will reboot after shutoff? shutdown -r 0
What does the number in in the shutdown command represent? time (in seconds) until shutdown
what is chkconfig used for? to view/add/remove what processes/software start up at boot time
What does insserv do? Enables an installed system init script by reading the comment header of the script.
what does lsmod give you? a list of loaded modules
what does insmod do? (insmod 'path') installs a loadable module in the running kernel
ls -li (what does this command do?) shows inode of file
df -ki shows inode usage
rmmod unload loadable modules
what command prints basic information currently available from the system uname -a
sysctl -A used to modify kernel parameters at runtime - displays all values currently available in table form.
what is the stat command used for to get file status
Created by: colleenwalsh
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