Generating new SSH Key

The objective of this tutorial is to generate a SSH Key in order to connect to your server without set your password each time.

• Prerequisites
• Generating new SSH Key
• Useful commands
• Sending SSH key to a server

Prerequisites

• SSH installed (ex: OpenSSH, OpenBSD Secure Shell server)

Generating new SSH Key

1. Execute this command below, substuting in your email address

   ssh-keygen -t rsa -b 4096 -C "your_email@example.com"
   

2. Add the ssh key into ssh-agent

ssh-add ~/.ssh/id_rsa

You can see more in this tuto

Useful commands:

a. Get list of key:

ssh-add -L

b. Remove a key

ssh-add -D ~/.ssh/id_rsa

c. Copy the key into the clipboard

pbcopy < id_rsa_git_evs.pub

If you don’t have pbcopy, you can install it easily. Here an example for ArchLinux users.

Sending SSH key to a server

https://www.skyminds.net/se-connecter-depuis-un-serveur-vers-un-nas-synology-avec-des-cles-ssh-sans-mot-de-passe/

sudo vim /etc/ssh/sshd_config

Protocol 2 LoginGraceTime 2m RSAAuthentication yes PubkeyAuthentication yes AuthorizedKeysFile .ssh/authorized_keys

chmod 700 /var/services/homes/jluccisano/.ssh chmod 644 /var/services/homes/jluccisano/.ssh/authorized_keys chmod 755 /var/services/homes/jluccisano

sudo synoservicectl –reload sshd

ssh-copy-id -i ~/.ssh/id_rsa.pub -p X username@address

Create Alias

cd ~/.ssh/
touch config
subl -a config

Host syno
 Hostname luccihermes.synology.me
 User jluccisano
 Port 87
 AddKeysToAgent yes
 UseKeychain yes
 IdentityFile ~/.ssh/id_rsa_syno

ssh syno