System Administrator: An Overview

(1)

System Administrator: 

An Overview

Michael Tsai 2017/03/06

(2)

“ ”

! Account provisioning

! Adding and removing hardware

! Performing backups

! Installing and upgrading software

! Monitoring the system

! Troubleshooting

! Maintaining local documentation

! Vigilantly monitoring security

1.1

(3)

Service Level Agreement

! SA is a service

! People and computers are the recipient of the service

! Service Level Agreement (SLA) sets appropriate expectations (we don’t have an official one here)

! Users are happy when:

! Computers are up and running

! Printers and file servers are available

! Data files stay as they left them

! Application software installed and works as it’s supposed to

! Friendly, knowledgable help is available when needed

(4)

Service Level Agreement

! When are users miserable?

! Downtime, scheduled (better) or unscheduled (worst)

! Upgrades introduce sudden, incompatible changes

! They receive incomprehensible messages from the system or system administrators

! They receive long explanations of why things aren’t working

! “No news is good news” ( )

(5)

Prioritize the queue

! Many people cannot work

! One person cannot work

! Requests for improvements

! Which one is more severe?

! FIFO

(6)

!

( + )

!

3:00-4:00

!

(7)

:

!

5:00-6:00

! ?

(8)

:

! 1:

!

! 2:

!

! 3:

( T_T)

(9)

: switch

!

switch

(10)

: switch

! : !

! :

! ( )

(11)

! ( )

! /  

(  

!)

! :

!

! :

!

(12)

7 “rules” for Sys Admins

• Please spend a few minutes to read: https://goo.gl/HkpI56 1. Knowledge-centric approach 

(as opposed to person-centric approach) 2. Paranoia

3. Testing (make sure everything works)

4. Documentation (to prevent person-centric)