You have to create a password less ssh connection between 3 Linux box for non root user i.e a normal user user1.
Pre-requisites
User user1 should exist on all the 3 Linux box
Server details
Login as user1
With the above command we have created a pair of public and private key using RSA type authentication.
Click the link to know more about RSA and DSA type of authentication
Now to create a password less ssh connection we need to copy id_rsa.pub to the remote server i.e server2 and server3
Using the above steps we have successfully created a password less authentication from
On server 2
Login as user1
Now to create a password less ssh connection we need to copy id_rsa.pub to the remote server i.e server 1 and server 3
Using the above steps we have successfully created a password less authentication from
Now to create a password less ssh connection we need to copy id_rsa.pub to the remote server i.e server 1 and server 2
Using the above steps we have successfully created a password less authentication from
Pre-requisites
User user1 should exist on all the 3 Linux box
Server details
server1.example
IP 192.168.1.6
server2.example
IP 192.168.1.11
server3.example
IP 192.168.1.12Making password less connection from server1
On server 1Login as user1
[user1@server1 ~]$ ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/home/user1/.ssh/id_rsa):
Created directory '/home/user1/.ssh'.
Enter passphrase (empty for no passphrase): [Press ENTER for EMPTY password]
Enter same passphrase again: [Press ENTER for EMPTY password]
Your identification has been saved in /home/user1/.ssh/id_rsa.
Your public key has been saved in /home/user1/.ssh/id_rsa.pub.
The key fingerprint is:
81:bf:d5:03:3f:a1:a4:81:27:b5:61:e4:e6:17:b9:a0 user1@server1.example
The key's randomart image is:
+--[ RSA 2048]----+
| .= |
| * o . |
| + O = . |
| B * B . |
| E S = = |
| + o |
| . |
| |
| |
+-----------------+With the above command we have created a pair of public and private key using RSA type authentication.
Click the link to know more about RSA and DSA type of authentication
Now to create a password less ssh connection we need to copy id_rsa.pub to the remote server i.e server2 and server3
[user1@server1 ~]$ ssh-copy-id user1@server2
The authenticity of host 'server2 (192.168.1.11)' can't be established.
RSA key fingerprint is de:75:8a:ff:26:1b:b5:82:61:36:9c:44:d2:57:3c:9e.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'server2,192.168.1.11' (RSA) to the list of known hosts.
user1@server2's password: [Give password for user1]
Now try logging into the machine, with "ssh 'user1@server2'", and check in:
.ssh/authorized_keys
to make sure we haven't added extra keys that you weren't expecting.[user1@server1 ~]$ ssh-copy-id user1@server3
The authenticity of host 'server3 (192.168.1.12)' can't be established.
RSA key fingerprint is 98:61:fb:91:8b:10:29:e1:b2:db:fd:52:6d:79:d7:1a.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'server3,192.168.1.12' (RSA) to the list of known hosts.
user1@server3's password: [Give password for user1]
Now try logging into the machine, with "ssh 'user1@server3'", and check in:
.ssh/authorized_keys
to make sure we haven't added extra keys that you weren't expecting.NOTE: Make sure the permission on authorized_keys is 600Using the above steps we have successfully created a password less authentication from
server 1 ------> server 2
server 1 ------> server 3Making password less connection from Server 2
On server 2
Login as user1
[user1@server2 ~]$ ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/home/user1/.ssh/id_rsa):
Enter passphrase (empty for no passphrase): [Press ENTER for EMPTY password]
Enter same passphrase again: [Press ENTER for EMPTY password]
Your identification has been saved in /home/user1/.ssh/id_rsa.
Your public key has been saved in /home/user1/.ssh/id_rsa.pub.
The key fingerprint is:
8f:0d:bc:8c:fc:d1:38:1a:b3:be:7a:8d:fc:8d:0d:1e user1@server2.example
The key's randomart image is:
+--[ RSA 2048]----+
| |
| |
| |
| . |
| S |
| . o O |
| .=oE + |
| +B.O |
| .+=o= o |
+-----------------+[user1@server2 ~]$ ssh-copy-id user1@server1
The authenticity of host 'server1 (192.168.1.6)' can't be established.
RSA key fingerprint is b8:36:c1:38:01:db:cc:89:b1:a9:b8:f7:f7:a8:17:ef.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'server1,192.168.1.6' (RSA) to the list of known hosts.
user1@server1's password: [Give password for user1]
Now try logging into the machine, with "ssh 'user1@server1'", and check in:
.ssh/authorized_keys
to make sure we haven't added extra keys that you weren't expecting.[user1@server2 ~]$ ssh-copy-id user1@server3
The authenticity of host 'server3 (192.168.1.12)' can't be established.
RSA key fingerprint is 98:61:fb:91:8b:10:29:e1:b2:db:fd:52:6d:79:d7:1a.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'server3,192.168.1.12' (RSA) to the list of known hosts.
user1@server3's password: [Give password for user1]
Now try logging into the machine, with "ssh 'user1@server3'", and check in:
.ssh/authorized_keys
to make sure we haven't added extra keys that you weren't expecting.Using the above steps we have successfully created a password less authentication from
server 2 ------> server 1
server 2 ------> server 3
Making password less connection from Server 3
On server 3
Login as user1
[user1@server3 ~]$ ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/home/user1/.ssh/id_rsa):
Enter passphrase (empty for no passphrase): [Press ENTER for EMPTY password]
Enter same passphrase again: [Press ENTER for EMPTY password]
Your identification has been saved in /home/user1/.ssh/id_rsa.
Your public key has been saved in /home/user1/.ssh/id_rsa.pub.
The key fingerprint is:
5b:99:c5:84:02:fd:ea:95:b7:51:2e:e3:28:f3:9d:9d user1@server3.exampleNow to create a password less ssh connection we need to copy id_rsa.pub to the remote server i.e server 1 and server 2
[user1@server3 ~]$ ssh-copy-id user1@server1
The authenticity of host 'server1 (192.168.1.6)' can't be established.
RSA key fingerprint is b8:36:c1:38:01:db:cc:89:b1:a9:b8:f7:f7:a8:17:ef.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'server1,192.168.1.6' (RSA) to the list of known hosts.
user1@server1's password: [Give password for user1]
Now try logging into the machine, with "ssh 'user1@server1'", and check in:
.ssh/authorized_keys
to make sure we haven't added extra keys that you weren't expecting.[user1@server3 ~]$ ssh-copy-id user1@server2
The authenticity of host 'server2 (192.168.1.11)' can't be established.
RSA key fingerprint is de:75:8a:ff:26:1b:b5:82:61:36:9c:44:d2:57:3c:9e.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'server2,192.168.1.11' (RSA) to the list of known hosts.
user1@server2's password: [Give password for user1]
Now try logging into the machine, with "ssh 'user1@server2'", and check in:
.ssh/authorized_keys
to make sure we haven't added extra keys that you weren't expecting.Using the above steps we have successfully created a password less authentication from
server 3 ------> server 1
server 3 ------> server 2
IMPORTANT NOTE:
|
For creating password less ssh authentication between multiple Linux machine using normal users make sure the two permissions are implemented or else the password less ssh authentication won't work
Permission 600 on authorized_keys file and
Permission 700 on .ssh directory
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