Introduction to SSH

asymmetric cryptography has two keys, a private and a public key.

it can be used to establish the identity of the owner of the private key.

the private key should be kept as safe as possible.

simple connection to a server is just done by ssh username@servername

scp can be used to copy files from and to remote computers

ssh uses host keys to ensure the identity of the server you connect to

You can jump between hosts by executing ssh within a ssh connection

SSH configuration file is in .ssh/config.

The configuration file allows us to automate and configure ssh.

We can define short names to connect to servers.

We can automate jumping between hosts.

We can disable a config file for debugging.

ssh-keygen can be used to create private/public key pairs for authentication

ssh-copy-id can be used to copy the public key to the server to enable login via the private key

which keys to use for which server can be configured in the configuration file

Agent forwarding can be used to make your local private keys available on the server you connect.

ssh-add allows you to add, list or remove identities from the agent

To be added…

each network connection consists of a host and a port number

port forwarding allows to connect to other services via ssh

ssh -L localport:remotehost:remoteport server will forward all connections to localport on the local machine to whatever is called remotehost at port remoteport on server

this allows to open jupyter notebooks on kekcc or other computing centers

There’s a lot to be discovered!