SSH & DevOps Crash Course Snippets

ssh.md

SSH Cheat Sheet

This sheet goes along with this SSH YouTube tutorial

Login via SSH with password (LOCAL SERVER)

$ ssh [email protected]

Create folder, file, install Apache (Just messing around)

$ mkdir test

$ cd test

$ touch hello.txt

$ sudo apt-get install apache2

Generate Keys (Local Machine)

$ ssh-keygen

Add Key to server in one command

> cat ~/.ssh/id_rsa.pub | ssh [email protected] "mkdir -p ~/.ssh && chmod 700 ~/.ssh && cat >> ~/.ssh/authorized_keys

Create & copy a file to the server using SCP

$ touch test.txt $ scp ~/test.txt [email protected]:~

DIGITAL OCEAN

Create account->create droplet

Create Keys For Droplet (id_rsa_do)

$ ssh-keygen -t rsa

Add Key When Creating Droplet

Try logging in

$ ssh root@doserver

If it doesn't work

$ ssh-add ~/.ssh/id_rsa_do (or whatever name you used)

Login should now work

$ ssh root@doserver

Update packages

$ sudo apt update

$ sudo apt upgrade

Create new user with sudo

$ adduser brad

$ id brad

$ usermod -aG sudo brad

$ id brad

Login as brad

> ssh brad@doserver

We need to add the key to brads .ssh on the server, log back in as root

$ ssh root@doserver

$ cd /home/brad

$ mkdir .ssh

$ cd .ssh

$ touch authorized_keys

> sudo nano authorized_keys (paste in the id_rsa_do.pub key, exit and log in as brad)

Disable root password login

$ sudo nano /etc/ssh/sshd_config

Set the following

PermitRootLogin no

PasswordAuthentication no

Reload sshd service

$ sudo systemctl reload sshd

Change owner of /home/brad/* to brad

$ sudo chown -R brad:brad /home/brad

May need to set permission

$ chmod 700 /home/brad/.ssh

Install Apache and visit ip

$ sudo apt install apache2 -y

Github

Generate Github Key(On Server)

$ ssh-keygen -t rsa (id_rsa_github or whatever you want)

Add new key

$ ssh-add /home/brad/.ssh/id_rsa_github

If you get a message about auth agent, run this and try again

```$ eval `ssh-agent -s````

Clone repo

$ git clone [email protected]:bradtraversy/react_otka_auth.git

Install Node

$ curl -sL https://deb.nodesource.com/setup_10.x | sudo -E bash -

$ sudo apt-get install -y nodejs

Install Dependencies

$ npm install

Start Dev Server and visit ip:3000

$ npm start

Build Out React App

$ npm run build

Move static build to web server root

$ sudo mv -v /home/brad/react_otka_auth/build/* /var/www/html

Very useful tutorial I say. I must say something and that's in order to access a self hosted server that doesn't have an easy web access like DigitalOcean has you have to become creative and find different means to copy and paste your public key to the server you're trying to access via SSH. One of the means, probably craziest and best at the same time in case of desktop server would be use of pastebin service with time-limited access. Our server runs desktop version of Ubuntu MATE, running as virtual machine under ProxMox on a physical machine, basically self hosted server. Console is simply just remote monitor and there is no shared clipboard feature so the only way I can copy paste between local machine and guest system on a remote server is using something like pastebin.

Thanks very much. Your video been in my YouTube downloaded videos for more than a year. Respect from Pakistan. @brad

I can't Thank you enough

If you run a server on a machine and then you move back and forth to 2 different networks(you'll have 2 different IPs). Is it possible to register 2 ssh keys in first run to work on both networks? The idea is to connect to server with the same user but in different local networks.

The command to "Add Key to server in one command" does not end with a double quote. Please fix. Thank you!

Thanks for the assistance, Brad!

Thanks a lot

thanks very helpful video

The youtube and gist is really helpful. You may want to update the github section as github recommends the ed25519 algorithm

Paste the text below, substituting in your GitHub email address.
$ ssh-keygen -t ed25519 -C "[email protected]"

Great work.

Thanks as always, the journey has been easier with you. l am just getting started with the Linux distro and it's like I don't know anything about it at all, do you or anyone have some resources they can refer me to, it would be of great help... Thanks again Brad!

thank you sir i just learned how to be more secure with ssh

thank you sir

Small mistake

The bash code for "Add key to server in one command" is missing a closing quotation mark. I don't know how other systems handle it, but in mine it kept expecting more lines until I added a closing quote.

thanks brad

Thanks brad.

Thanks Brad

extremely insightful.

Thanks brad

Thanks

In the "Add key to server in one command" where is the double quote supposed to end?

In the "Add key to server in one command" where is the double quote supposed to end?

at the end of the command

Thanks for this Brad

you're welcome

Awesome 🙌

that's awesome sir