Secure Shell (SSH)

A means of securly connecting to a remote computer's shell.

Public / Private key

When attempting to connect, the command will look at your "~/.ssh" directory and enumerate through all the keys there (prior to this your public key will have been added to the remote host).

Key Generation

ssh-keygen

ssh-keygen -t rsa -b 4096 -C "$(git config kevin@bluer.com)" -f gh-pages-actions -N ""

Copying Keypair to host

In the following example, the -i is the identity you're copying...

ssh-copy-id -i raspberry pi@192.168.86.181
ssh-copy-id pi@192.168.86.45

Connecting with a specific Keypair

ssh pi@192.168.86.181 -i ~/.ssh/raspberry
ssh pi@192.168.86.45 -i ~/.ssh/raspberry

An example with agent forwarding...

ssh -A -i ~/.ssh/xyz you@42.171.111.35

More detail on ssh-agent here.

SSH Add

ssh-add is a command for adding SSH private keys into the SSH authentication agent for implementing single sign-on with SSH.

ssh-add <keyname>

List

Lists public key parameters of all identities currently represented by the agent.

ssh-add -L

Using Keys

Example using a .pem file...

ssh -i ~/.ssh/xyz.pem 52.255.202.123 

Note that it will need to be permissioned correcty...

sudo chmod 600 ~/.ssh/xyz.pem

Remember hosts

Add the following (example) to your ~/.ssh/config file...

Host bluer.com
  HostName 163.217.8.40
  IdentityFile ~/.ssh/bluer
  User kevin

This will then allow you to tab complete from the terminal...e.g.

$ ssh bluer.com