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)
