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Operating Systems in Practice

Remote Connection and SSH

office and home laptop
Remote connection Allows us to manage multiple machines from anywhere in the world
Secure Shell A protocol implemented by other programs to securily access one computer from another
OpenSSH program
ssh cindy@104.131.122.215
Private
Public
Virtual Private Network - VPN Allows you to connect to ap private network, like your work network, over the internet

Remote Connection on Windows

PuTTY A free, open source software that you can use to make remote connections through several network protocols, including SSH
GUI
putty.exe -ssh cindy@104.131.122.215
RDP
Microsoft Terminal services Client
mstsc.exe
/admin

Remote Connection File Transfer

Secure Copy- SCP A commnad you can use in linux yo copy files between computers on a network
scp /home/cindy/Desktop/myfile.txt cindy@104.131.122.215

Remote Connection File Transfer on Windows

PuTTY Secure Copy Client
pscp.exe
pscp.exe C:\Users\cindy\Desktop\myfile.txt cindy@104.131.122.215
Shared folders
GUI
net share
net share ShareMe=C:\Users\cindy\Desktop\ShareMe /grant:everyone.full

Virtual Machines

Virtual Machine A single virtual machine
VirtualBox
GUI

System Monitoring

tail -f /var/log/syslog
Logging The act of creating log events

The Windows Events Viewer

Event Viewer
eventvwr.msc
GUI

Linux Logs

/var/log
ls /var/log
/var/log/syslog
logtotate
Centralized logging
less /var/log/syslog
Epoch time

Working with Logs

less /var/log/syslog | grep error
tail
tail -f /var/log/syslog

Imaging Software

Operating Systems Deployment Methods

Drive -> Clone -> install folders, files and settings
Clonezilla
Symantc Ghost
Disk-to-disk cloning
dd
unmount /dev/sdd
sudo dd if=/dev/sdd of=~/Desktop/my_usb_image.img bs=100m

Mobile Device Resetting and Imaging

Factory reset
Over the air
Re-flash

Download the update to a computer
Attach the mobile device to a computer using a USB cable
Run some software on the computer that will re-flash the mobile device

Course wrap up