Basic Linux Administration: Maintenance and Security

Source: www.cs.siu.edu
Topic: Linux

Short Desciption:
Chapter 8 Basic Linux Administration: Maintenance and Security ... Important to maintain the system • Linux is ... distribution-specific tools • Would require root ...

 

Content Inside:
Chapter 8 Basic Linux Administration:  Maintenance and Security System administration • Important to maintain the system • Linux is extensible • Can tweak it for performance and security endlessly • Several routine tasks need to be done once in a while • System should be checked for security • Running service (processes) should be checked • Graphical tools available for administration • May get in the way sometimes • Usually distribution-specific tools • Would require root previliges for most tasks • login as root • use sudo or su root Administration Tasks • Managing user and groups • Managing hard disk and filesystems • Managing processes and services • Startup and Shutdown • Performance monitoring and tuning • System backup • Job scheduling • Maintaining system security • Software installating and upgrade System Startup • First,  kernel is loaded into memory • Prints messages on console • Saves messages /var/log/messages • Use dmesg • init is run right after kernel and device drivers are loaded • runs new processes and restarts some after they quit • inits joblist is in the file /etc/inittab • Can be edited by root • Works on the concept of runlevels Shutdown • Can do it graphically • Command line for more options • /sbin/shutdown with sudo • -r for reboot, -h for halt • /sbin/shutdown -r +5 "Rebooting. Just for fun" • reboots in 5 minutes,  with the message displayed to all logged in users • /sbin/shutdown -h now • halts starting immediately • Ctrl-Alt-Delete should work with most systems • check/modify entry for ctrlaltdel in /etc/inittab • /sbin/shutdown -c to cancel a running shutdown /proc and /dev filesystems • /proc acts like any other filesystem • can navigate using cd and ls commands • view files using cat • None of these fil ...

 

 

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