To resolve the request for password after SSH configuration without password login

http://inuyasha1027.blog.51cto.com/4003695/1132896/

Host ip:192.168.163.100 (HOSTNAME:NODE0)

SSH remote machine ip:192.168.163.101 (hostname:node1) without password login

The first step is to modify the configuration file of the remote machine to which the host and SSH are connected:

Vi/etc/ssh/sshd_config

(to ensure that these characters have no comment symbol "#" before them)

Rsaauthentication Yes

Pubkeyauthentication Yes

Authorizedkeysfile. Ssh/authorized_keys

Passwordauthentication Yes

Peimitemptypasswords Yes

1. Enter the command on the local machine: ssh-keygen-t RSA

2. Then press ENTER, by default, the public key generated by SSH is stored in the

/root/.ssh

This folder is Id_rsa and Id_rsa.pub, respectively.

PS: If a Hadoop user logs in because the Hadoop user initially logs in to the directory that is the root of the Hadoop user, then do it under Home/hadoop, which is the difference between root/.ssh and home/hadoop/.ssh on the web.

3. Create a file on the local machine Authorized_keys

Touch/root/.ssh/authorized_keys

and append the public key to the Authorized_keys file:

Cat Id_rsa.pub >> Authorized_keys

4. Create the folders and files on the remote host as follows:

/root/.ssh/authorized_keys

5. Modify the permissions of the folder/root/.ssh:

(both local and remote machines have to be modified)

chmod 700/root/.ssh

6. Modify the properties of the file:

chmod 600/root/.ssh/authorized_keys

7. Copy the public key to the remote machine with IP address 192.168.163.101:

Ssh-copy-id-i/root/.ssh/id_rsa.pub [email protected]

I have created a folder and a file on the remote host when I entered the command as follows:

/root/.ssh/authorized_keys

Also, permissions have been modified as described above/.ssh (/.ssh/authorized) (600)

(Practice proves that this command is better than the SCP command when transferring the public key)

8. Execute the command on the local machine:

Ssh-add/root/.ssh/id_rsa

This is to add the public key in.

9. Restart the SSH service:

Service sshd Restart

10. On the local host, enter:

SSH node1 (carriage return)

Can log on to the remote host.

PS: Folder path or file name varies according to individual configuration,

Changes need to be made according to specific circumstances.

Do not modify permissions and do not execute Ssh-add command for folders and files

Causes a password to be entered after the remote login is set.

Of course, you should also pay attention to the configuration file settings and modifications.

Good luck ~

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There are several ways to copy the public key to the server's ~/.ssh/authorized_keys file:
1, the public key through the SCP copy to the server, and then appended to the ~/.ssh/authorized_keys file, this way is more troublesome. Scp-p ~/.ssh/id_rsa.pub [email protected]:~/.
2, through the Ssh-copyid program, is my demonstration method, Ssh-copyid [email protected] can, but this way does not support changing the port number (I did not find). The program common release version of Linux comes with no installation, in fact the program is a script.
3. Can be ~/.ssh/id_rsa.pub by cat | ssh-p [email protected] ' cat >> ~/.ssh/authorized_keys ', this is also a more common method, because you can change the port number.

To resolve the request for password after SSH configuration without password login