Linux Bootcamp Series – 14/Dec/2019

Linux Bootcamp Series

Operating System

  • OS acts as an interface between User/Application and Hardware
  • OS can interact with multiple devices (Device Driver might be necessary). This interaction complexity is abstracted from users/Applications
  • OS also gives some System Applications and User Applications. Preview


  • Desktop Operating Systems:
    • Example: Windows 10, Mac, Ubuntu Desktop, Fedora
    • Users interaction on this server has to be simple.
    • Generally GUI Based
  • Server Operating Systems
    • Examples: Windows Server 2016, Ubuntu Server, RedHat Linux, Open SUSE
    • User interaction can be little bit complicated.
    • Generally Non-UI / Terminal Based.

Linux Operating System

  • Linux works on Desktops/Servers/Embedded Systems etc…
  • Linux Kernel is the key component
  • A Distribution (Parent Distribution/Platform) is built on top of kernel. Popular Distributions are
    • Debian
    • RedHat
    • Andriod
    • SUSE
  • Companies like canonical etc take these parent kernels and they build the distributions which are most widely use. Some of Widely Used Distributions are
    • Ubuntu
    • Centos
    • RHEL

Lab Setup:

  • Ubuntu Linux Instance on AWS or Azure
  • Windows:
    • Git For Windows

Connecting to Linux Machine

  • Any Linux Machine can be connected using SSH Protocol.
  • Windows:
    • Install Git For Windows
  • SSH Command for LInux Machines with Username and Password
ssh username@ipaddress
  • SSH Command for LInux Machines with Username and KeyFile(PEM)
ssh -i <path-to-pem>   username@ipadress

Important Things to Consider

  • Shell:

    • Helps you interacting with OS/Kernel
    • Shell is a command line based
    • Examples
      • bash (Bourne Again Shell)
      • zsh
  • Commands:

    • Commands perform some action.
    • Command has a syntax
    <command> <paramters>
  • Parameters:

    • Parameters are of two kinds, Positional Parameters and Named Parameters.
  • Positional Parameter:

    • directly entering the value of parameter
    • Examples:
    mkdir test
    mv /tmp /temp
  • Named Parameter:

    • Will have associated name with every paramter you enter
    • Examples:
    ping -c 10
    # -c is named paramter which has a value of 10
    ansible-playbook --inventory hosts  test.yml
    # --inventory is named parameter which has value of hosts
    • Named parameters generally have two forms
      • short form:
        • eg: ansible-playbook -i hosts test.yml
      • long form:
        • eg: ansible-playbook –inventory hosts test.yml
  • Manual:

    • Every Linux command has a help which is called as manual.
    • To look at manual of any command use
    man <command>
    • Examples:
    man ls

Sample Commands to be executed

1. Display Linux System Information
# Display Linux system information
uname -a

# Display kernel release information
uname -r

# Show which version of redhat installed
cat /etc/redhat-release

# Show how long the system has been running + load

# Show system host name

# Display the IP addresses of the host
hostname -I

# Show system reboot history
last reboot

# Show the current date and time

# Show this month's calendar

# Display who is online

# Who you are logged in as

Create a folder structure use mkdir and touch

  • ecommerceapp
    • src
    • test
    • docs

One thought on “Linux Bootcamp Series – 14/Dec/2019

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.

About continuous learner

devops & cloud enthusiastic learner