Configure SSH without password login under Linux

mkdir ~/.ssh

chmod ~/.ssh

SSH-KEYGEN-T RSA

Ssh-keygen-t DSA

Then, execute the following command on the node Dbtest1

Cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

Cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys

SSH dbtest2 cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

SSH dbtest2 cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys

SCP ~/.ssh/authorized_keys Dbtest2:~/.ssh/authorized_keys

Node 1:

node1:~ #cd/root

node1:~ # mkdir. SSH

node1:~ # chmod. SSH

node1:~ # ssh-keygen-t RSA

Generating public/private RSA key pair.

Enter file in which to save the key (/ROOT/.SSH/ID_RSA):

Enter passphrase (empty for no passphrase):

Enter same Passphrase again:

Your identification has been saved In/root/.ssh/id_rsa.

Your public key has been saved in/root/.ssh/id_rsa.pub.

The key fingerprint is:

b0:1d:73:0a:99:2a:ee:ce:cd:5f:de:e5:db:c9:ab:6e [MD5] [email protected]

The key ' s Randomart image is:

+--[RSA 2048]----+

| |

| o |

|      = O. |

| . = =       |

| . . . S |

| .             . |

|     .   .    . |

| o O. Oeo. |

|. + O ..... o=o=. |

+--[MD5]----------+

node1:~ # Ssh-keygen-t DSA

Generating Public/private DSA key pair.

Enter file in which to save the key (/ROOT/.SSH/ID_DSA):

Enter passphrase (empty for no passphrase):

Enter same Passphrase again:

Your identification has been saved IN/ROOT/.SSH/ID_DSA.

Your public key has been saved in/root/.ssh/id_dsa.pub.

The key fingerprint is:

9c:93:19:6b:df:bd:f3:01:b6:82:be:32:0c:ee:b0:68 [MD5] [email protected]

The key ' s Randomart image is:

+--[DSA 1024x768]----+

| |

| |

|        . |

| . *       |

| S O |

| . . O....O |

| .. o ..... |

|   E.. O. +. . ...|

|..   ... oo. . o.|

+--[MD5]----------+

node1:~ #

Node 2

node2:~ # Cd/root

node2:~ # mkdir. SSH

node2:~ # chmod ssh/

node2:~ # ssh-keygen-t RSA

Generating public/private RSA key pair.

Enter file in which to save the key (/ROOT/.SSH/ID_RSA):

Enter passphrase (empty for no passphrase):

Enter same Passphrase again:

Your identification has been saved In/root/.ssh/id_rsa.

Your public key has been saved in/root/.ssh/id_rsa.pub.

The key fingerprint is:

f2:ca:0c:73:98:04:55:69:48:1a:9a:a8:8e:0c:96:0c [MD5] [email protected]

The key ' s Randomart image is:

+--[RSA 2048]----+

| ..         Oo.. |

|. O +. o |

|           E O. |

|+ .. |

|o+. . S |

|*  . o O |

|. o =.        . |

|         * . |

| +          |

+--[MD5]----------+

node2:~ # Ssh-keygen-t DSA

Generating Public/private DSA key pair.

Enter file in which to save the key (/ROOT/.SSH/ID_DSA):

Enter passphrase (empty for no passphrase):

Enter same Passphrase again:

Your identification has been saved IN/ROOT/.SSH/ID_DSA.

Your public key has been saved in/root/.ssh/id_dsa.pub.

The key fingerprint is:

6a:c4:e1:cc:bb:c7:32:51:5c:96:49:46:24:df:86:ad [MD5] [email protected]

The key ' s Randomart image is:

+--[DSA 1024x768]----+

| . +=o |

| +=+     |

| .. OO + |

| =. o O |

| *. S E |

| .. o |

| +o |

| . o.o |

| .+         |

+--[MD5]----------+

node2:~ #

Sync Authorized_key

NODE1:~/.SSH # cat Id_rsa.pub >>authorized_keys

NODE1:~/.SSH # cat Id_dsa.pub >>authorized_keys

NODE1:~/.SSH # ssh Node2 cat/root/.ssh/id_rsa.pub >> Authorized_keys

The authenticity of host ' Node2 (10.0.0.31) ' can ' t be established.

ECDSA key fingerprint is b4:30:1b:97:e9:75:1e:e2:2c:85:91:2a:76:85:77:ce [MD5].

Is you sure want to continue connecting (yes/no)? Yes

warning:permanently added ' node2,10.0.0.31 ' (ECDSA) to the list of known hosts.

Password:

NODE1:~/.SSH # ssh Node2 cat/root/.ssh/id_dsa.pub >> Authorized_keys

Password:

NODE1:~/.SSH # SCP Authorized_keys node2:/root/.ssh/

Password:

Authorized_keys 100% 1984 1.9KB/S 00:00

NODE1:~/.SSH #

Test

NODE1:~/.SSH # SSH Node2 date

Sat May 9 05:40:58 CST 2015

NODE1:~/.SSH #

node2:~ # SSH Node1 Date

Sat May 9 05:41:03 CST 2015

node2:~ #

This article is from "Technical achievement dream!" "Blog, be sure to keep this provenance http://dreamsanqin.blog.51cto.com/845412/1659584

Configure SSH without password login under Linux