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 brad@192.168.1.29

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 or ssh-keygen -t rsa

to copy the new key use:

pbcopy < ~/.ssh/id_rsa.pub

Add Key to server in one command

> cat ~/.ssh/id_rsa.pub | ssh brad@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 $ scp ~/test.txt brad@192.168.1.29:~

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 git@github.com: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

Assign private SSH key when cloning in Git

$ ssh-agent bash -c 'ssh-add /somewhere/yourkey; git clone git@github.com:user/project.git'

Troubleshooting

ssh-keygen command not found when setting up Git on Windows

You will need an ssh client, since it appears you on using windows you can use http://cygwin.com/ and it will come with one, I don't know about a portable version of ssh, though.

How to add the passphrase of an specific ssh key and stop getting the error with VSCode requering the public key

First add the passpharse to your keychain

ssh-add -K ~/.ssh/id_rsa

Where id_rsa is the name of the ssh key, change this value to whatever name you use. Then edit the ssh config file

code ~/.ssh/config

Paste this to it:

Host *
  AddKeysToAgent yes
  UseKeychain yes
  IdentityFile ~/.ssh/id_rsa

Where again id_rsa is the name of the ssh key you want to add to the verification.

Refences:

• https://superuser.com/a/1127520
• https://www.velumi.com/guides/vs-code-get-permission-denied-publickey-mac/