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Day 4.md

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DAY4 CLOUD TECHNOLOGY AWS

Notes ~ :

  • 75% traffic over network is passed through amazon
  • AWS is used in : Raspberry Pi , Robot Automation , ML
  • To use cloud use aws.amazon.com portal and select mumbai (country) #because its least costly
  • AWS uses AMI instead of ISO image to use OS without installing
  • AWS does not support MAC
  • AWS uses RDP (Remote Desktop Protocol) to access Windows from different location [client] - - > (Internet) - - > [Windows at Server side]
  • AWS uses SSH(Secure Shell) to connect with LINUX [Client] - - (SSH) - [Internet]- - > [ LINUX ]
  • EC2(Elastic Compute Cloud) - > used when need to use an OS
  • Red Hat uses Remote Desktop and command $ ssh -i key-file-path user-name@IP #to run cloud on local machine
  • In Windows,Press Windows key + r - > mstsc (Opens remote desktop connection) or Use putty
  • Ubuntu uses Remote Viewer to run cloud on local machine
  • putty understands only .ppk extension
  • puttygen converts file with .pem extension to .ppk extension [Local System] - > (SSH) - > [AWS]
  • SSH is more secured then RDP
  • putty is a SSH client software
  • LINUX / OS is target SSH Server
  • Terminal is also a kind of SSH client server like putty
  • Users information with their power (UID range) is stored in /etc/passwd
  • AWS (Amazon Web Services)
  • ECU (Elastic Container/Computer Unit)
    • Computing resources and Memory required for the instance
  • AMI (Amazon Machine Image)
    • Operating system Image which we dont need to install amazon will set it up automatically you will be getting the desktop directly without installation
  • EBS (Elastic Block Storage)
    • Storage Mechanism Scalable depending upon the requirements.
  • RDP (Remote Desktop Protocol)
    • This protocol will be used to access the windows machine.
  • SSH (Secure Shell)
    • This protocol will be used to connect the linux machine.
  • EC2 (Elastic Compute Cloud)
    • It is the collection of the above technologies.
    • EC2 is a unique word which can be used in every programming language to connect with instances.

LINUX Commands ~ :

  • $ chmod 400 file-name.extension # Secures the file from public
  • $ ssh user-name@IP # To connect to IP of different instance
  • $ ssh -i key-path user-name@IP # red hat command to connect to cloud instance
  • $ sudo -i # switch user to root without password when connected to cloud instance
  • $ passwd user-name # give password to a user
  • $ userdel -r user-name # removes user, -r removes all data stored by user being removed
  • $ adduser user-name # add user in ubuntu OS
  • $ id -u # shows the id of user

CLOUD VS Local Machine ~ :

Cloud

1. AWS has ECU(Elasting Computing Unit) which gives RAM & CPU
2. AWS has EBS(Elastic Block Storage,which is changeable hard-disk size)
3. AWS uses AMI(Amazon Machine Image) makes image of OS which has no need to be installed
4. Username and Password are set automatically in machine

Local Machine

1. Requires RAM & CPU
2. Requires Hard Disk
3. Install Image from ISO/CD/DVD form
4. Username and Password are set manually

Selecting and Running an Instance ~ :

  • VM in AWS is called Instance
  • Select Services - > Compute - > EC2
  • Select free instance
  • Click Next for configuration
  • No of instance = 1 , Storage = 30 GB
  • after storage skip the tasl
  • select Security group - > Source - > My IP
  • Finally Launch
  • Create new key pair , name-you-write-is-file-name
  • Download File in a safe place
  • Right Click Instance - > Window Password - > Upload Downloaded File - > Public DNS == IP Address
  • After use, Right Click Instance - > shutdown

Connect Using Putty in windows ~ :

  1. Install putty and puttygen
  2. Convert/Decrypt Key - file for password by : * open puttygen * load file (key-file.pem) * save private key (key-file.ppk) * type of key to generate RSA
  3. Open putty and write IP to connect to
  4. Select SSH [ + ] - > click on Auth - > Load ppk file

Authentication Powers of User

  1. In Windows, a user with UID = 500 has all power to operate in OS
  2. In Red-Hat, a user with UID = 0 has all power to operate in OS
  3. In LINUX, a user with UID range b/w 1000-6000 is Normal User a user with UID range b/w 60001 - 65535 and 1-999 is System User

Types of Users~ :

  • Admin
  • Normal
  • System (made by root to complete all sub-tasks like system shutdown, open application, run printer etc)

TASK

  1. WAP that runs different commands each after some delay
  2. Make user in windows using command line
  3. Make a new user and make it root then make sure new-user has no access to change root permissions from being admin
  4. More then 1 user to write in same file