SSH Snippets to login to the server

ssh-login.bash

# SSH Cheat Sheet

# Create folder, file, install Apache (Just messing around)
mkdir test
cd test

# Create hello.txt file
touch hello.txt

# Install Apache server
sudo apt-get install apache2

# Generate Keys (Local Machine)
ssh-keygen

# See content of the key folder
ls .ssh

# See content of the public key
cat .ssh/id_rsa.pub

# Now need to put public key on the server
# If have brew (macOS) use
brew install ssh-copy-id

# Alternative. Add Key to server in one command
#cat ~/.ssh/id_rsa.pub | ssh daniil@192.168.1.29 "mkdir -p ~/.ssh && chmod 700 ~/.ssh && cat >>  ~/.ssh/authorized_keys

# Create & copy a file to the server using SCP
touch test.txt

# Put in the home folder in the server
scp ~/test.txt daniil@192.168.1.29:~

# Login via SSH without the password (LOCAL SERVER)
ssh daniil@192.168.1.29

# DIGITAL OCEAN

# Create Keys For Droplet (i.e. id_rsa_do, but you can choose different name. DO stands for Digital Ocean)
ssh-keygen -t rsa

## Create account->create droplet
## Add Key When Creating Droplet

# Try logging in
ssh root@SERVERS_IP_ADDRESS

# If it doesn't work, add your key, using the name you've choose during creation
ssh-add ~/.ssh/id_rsa_do

# Login should now work
ssh root@SERVERS_IP_ADDRESS

# Update packages
sudo apt update
sudo apt upgrade

# Create new user with sudo, never use root user, to prevent bruteforce etc.
adduser daniil

# Just user without the priviliges
id daniil

# Add priviliges
usermod -aG sudo daniil

# Now user with the priviliges
id daniil

# Login as daniil, wont work -> PERMISION DENIED
ssh daniil@SERVERS_IP_ADDRESS

# We need to add the key to daniils .ssh on the server, log back in as root
ssh root@SERVERS_IP_ADDRESS
cd /home/daniil
mkdir .ssh
cd .ssh
touch authorized_keys

# Paste in the id_rsa_do.pub key, exit and log in as daniil
sudo nano authorized_keys

# Now exit the root and login with newly created user name
exit
ssh daniil@SERVERS_IP_ADDRESS