4.13. Using SSH agent to login on remote clusters¶
$ ssh-keygen -t rsa -b 4096 -f ~/.ssh/marconi
Generating public/private rsa key pair.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/leon/.ssh/marconi.
Your public key has been saved in /home/leon/.ssh/marconi.pub.
The key fingerprint is:
SHA256:Teq9Lu4Lcw3E7IhKVfDIdpXZ1fTathq1MJktAWQ8Nl0 leon@dell5520a
The key's randomart image is:
+---[RSA 4096]----+
| ... .+o=oooE |
| . + +o o=.... |
| = o + o o. .|
| o o + + =o |
| . . . S . *.oo|
| . . . + =.o|
| . o o o . o |
| +. . o |
| o++o . |
+----[SHA256]-----+
Now we copy public key to remote machine.
$ ssh-copy-id -i ~/.ssh/marconi g2kosl@s38.eufus.eu /usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: “/home/leon/.ssh/marconi.pub” The authenticity of host ‘s38.eufus.eu (130.186.25.38)’ can’t be established. ECDSA key fingerprint is SHA256:8bFSzd26+BVm5Bz/TufbMFqPcFghziUyYJsrXdFRwFI. Are you sure you want to continue connecting (yes/no)? yes /usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed /usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed – if you are prompted now it is to install the new keys g2kosl@s38.eufus.eu’s password:
Number of key(s) added: 1
Now try logging into the machine, with: “ssh ‘g2kosl@s38.eufus.eu’” and check to make sure that only the key(s) you wanted were added.
Note
Please note that the $HOME\.ssh
directory must have the correct
permissions. Only the user can have write
permission to $HOME\.ssh
directory. To unset write permission for others write
chmod go-w ~/.ssh
This goes the same for $HOME
directory.