Update cluster keys

BE AWARE THAT IF YOU REMOVE YOUR OLD KEY BEFORE UPDATING THE REMOTE SYSTEM, YOU WILL NEVER MORE GET ACCESS TO THE CLUSTERS

  1. Create a backup copy of your old private and public keys
  2. Create the new keys with a name different from the existing one
  3. Access all the clusters on which you need to update the public-key and add the content of the new public-key in ~/.ssh/authorized_keys, then remove your old public key line
  4. Back on your local machine, copy the new public and private keys with the correct name and location.

Here you can find an example:

Create a backup of the old keys
cp id_dsa id_dsa.OLD
cp id_dsa.pub id_dsa.pub.OLD
Create the new keys as usual, but specifying a different name
ssh-keygen -t dsa -f ~/.ssh/NEWKEY
Copy the new public key on the cluster...
cat ~/.ssh/NEWKEY.pub | ssh cluster "cat >> ~/.ssh/authorized_keys"
Substitute the keys
mv NEWKEY id_dsa
mv NEWKEY.pub id_dsa.pub
Logon on the cluster and remove the old public key from ~/.ssh/authorized_keys

Have a nice computation...