Let's start with the opening act!

SSH

Secure Shell Protocol

Port: 22

What is SSH?

  • Network Protocol used for remote administration

  • Created in 1995 by Tatu Ylönen, SSH protocol

  • Uses Public-key based authentication for controlled access

Why SSH?

And

Alternatives?

rlogin

telnet

ftp

How it works?

How to connect?

  • SSH client
  • Access permission (User and password)
  • Server address (IP/URL)

ssh <user>@<ip-address>

-v: verbose

-i: identify file (.pem file)

Processes & Services

  • Each program in execution is a process
  • All processes are tracked by Operating system
  • Linux keep process details in /etc/proc

Lifecycle of process

Process management?

View all active processes

ps

-a: all process

-u: for users in userlist

Services

Set of processes

How to manage services?

systemd

Systemd: service manager

  • Check status
  • Start service
  • Stop service
  • Control service

systemd

status

<service>

start

stop

enable

Logging

Questions?

Thank you!

Kernel (Drivers)

Copy of LearningTheLinux

By Mohit Bansal

Copy of LearningTheLinux

A filler talk on how open source evolved over time and how git came into picture. The skills that can be useful to start contributing in open source, both technical and non-technical.

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