Connexion SSH au serveur RHEL 7 sans mot de passe

Pour se connecter au serveur Linux RHEL7, nous devons d’abord échanger des clés publiques entre le serveur et la machine cliente. Pour ce faire, nous pouvons utiliser la commande ssh-copy-id.

ssh-copy-id user@rhel-server
The authenticity of host 'rhel-server (rhel-server)' can't be established.
ECDSA key fingerprint is 21:4d:71:f6:ef:1f:c1:f7:a9:d9:81:4d:9d:34:4d:a9.
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
user@rhel-server's password: 

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh 'user@rhel-server'"
and check to make sure that only the key(s) you wanted were added.

La commande ci-dessus vous fournira un mot de passe sur la base duquel votre accès au serveur distant sera authentifié et votre mot de passe échangé. Si vous recevez un message d’erreur indiquant :

/usr/bin/ssh-copy-id: ERROR: No identities found

Vous devez d’abord générer vos clés SSH à l’aide de la commande ci-dessous :

ssh-keygen 
Generating public/private rsa key pair.
Enter file in which to save the key (/home/user/.ssh/id_rsa): 
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /home/user/.ssh/id_rsa.
Your public key has been saved in /home/user/.ssh/id_rsa.pub.
The key fingerprint is:
2a:2b:8b:c3:10:2c:0e:8a:7e:bf:0d:2c:fa:31:dc:99 user@localhost.localdomain
The key's randomart image is:
+--[ RSA 2048]----+
|                 |
|                 |
|.                |
|+.               |
|*.      S        |
|+.. o o.         |
|+  =.E.          |
|.+o.+oo          |
|.o++oo..         |
+-----------------+

Une fois cela fait, essayez à nouveau la commande ssh-copy-id ci-dessus.