How to generate an SSH key

Step by step guide

On your local machine, generate an SSH key, ensuring a good key length and type :
```
ssh-keygen -b 4096 -t rsa
```
Copy the public key from your computer:
```
cat ~/.ssh/id_rsa.pub
```
Connect to a cluster frontend node (izar, helvetios, fidis, deneb1).epfl.ch and paste the public key in the authorized_keys file:
```
mkdir .ssh
chmod 700 .ssh
echo 'ssh-rsa AAAAXXX[...]' >> .ssh/authorized_keys
```
You should now be able to login without a password on all the clusters including the data nodes.