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Systems Administration
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Administering the system?
Keep the system up in a consistent state
Monitor performance
Babysit users, make changes on their behalf
Install, configure, upgrade, maintain
Backup, restore, disaster recovery
B2/6/2 Vashi ,Navi Mumbai,
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linuxadmincoursetraining.vibranttechnologies.co.in
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Sysadmins
• System administration handled by various people
– Full time dedicated sysadmins on site
– Remote services
– Generic ‘IT’ personnel
– That user that seems to know what they’re doing
• Can be a skill set central to a career path, or a
means to an end
B2/6/2 Vashi ,Navi Mumbai,
Contact:09892900103/9892900173
linuxadmincoursetraining.vibranttechnologies.co.in
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Privilege Hierarchy
• Want to divide system privilege by account
• First step is file level permissions
– Default permissions limit end users in what
configuration files they can read and which programs
they can run
• Next level is within system programs
– Limit certain functions to only users with ‘elevated’
privileges
B2/6/2 Vashi ,Navi Mumbai,
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The Superuser
• By default, one account has elevated privileges to
issue any command, access any file, and perform
every function
• Superuser, a.k.a. root
– Technically, can change to anything – but don’t
• User and group number 0
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The Superuser, cont
• Must limit use of root
– Inexperienced users can cause serious harm
– Use of root for non-privileged tasks unnecessary and
can be open to attack
– Security and privacy violations – root can look at
anyone’s files
• Limit what root can do remotely
• Ensure a strong password
B2/6/2 Vashi ,Navi Mumbai,
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sudo
• Allows you to issue a single command as another
user
• Syntax:
sudo [options] [-u user] command
• Again, if no user specified, root assumed
• New shell opened with user’s privileges
• Specified command executed
• Shell exited Mumbai,
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Understanding Operating Systems
• Software
– Collection of instructions that control the tasks
a computer performs
– Can be changed without disassembling the
computer and rewiring
• Operating system
– Software that helps other programs control
computer hardware and interact with users
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Operating System Functions
• Initialize computer hardware
• Allocate system resources to programs
• Keep track of multiple programs running at
same time
• Provide organized method for all programs
to use system devices
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The UNIX Operating System
• UNIX
– Operating system
– Originally created at AT&T Bell Labs in
early 1970s
– Designed to control networked computers that
were shared by many users
– Features and low cost of Linux effectively
driving UNIX out of market
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The Free Software Foundation
and the GNU Project
• Free software foundation (FSF)
– Software itself should not be restricted in
distribution by standard commercial license
agreement
• GNU project
– Completely free version of UNIX
– Written from scratch
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Where to Get More Information
Vibrant Group:
www.vibrantgroup.co.in
Vibrant Technologies & Computers
www.vibranttechnologies.co.in/technologies.vibrantgroup.co.
in
Vibrant HR Team
www.hr.vibrangroup.co.in
B2/6/2 Vashi ,Navi Mumbai,
Contact:09892900103/9892900173
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enquiry@vibrantgroup.co.in
