In order to login to RHEL7 Linux server we first need to exchange public keys between server and client machine. To do that we can use ssh-copy-id command.
$ 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.
The above command will propt you for a password based upon which your access to the remote server will be authenticated and password exchanged. If you get an error message saying:
/usr/bin/ssh-copy-id: ERROR: No identities found
you first need to generate your ssh keys using below command:
$ 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.. | +-----------------+
Once done attempt to the above ssh-copy-id command again.