SSH Enable Without Password Authentication On Ubuntu 14.04/16.04

SSH means secure shell network protocol system. SSH system default connection port 22. If you can change to another using port for security purposes. So I have to show SSH enable without password authentication. It’s very important think if you can mysql DB replication then must be ssh enable without password authentication.

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Requirements :

• ssh must enable
• any firewall disable
• Hosts file localhost comment out

#127.0.0.1  localhost
10.66.50.1  SSH-1

Server -1 configuration for enable ssh without password authentication

root@SSH-1:~# mkdir .ssh

Goto .ssh/ directory

root@SSH-1:~# cd .ssh/

Run command ssh-keygen

root@SSH-1:~/.ssh# ssh-keygen

Press Enter four times. See as like below image

root@SSH-1:~/.ssh# cat id_rsa.pub

See example below

MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC02n91bcmnAsiNuHgOvMdlxmh2
OIwq9jJriiEv3B1TJhsTvcRfYVB6aldxEpW8V9NdBVXzt9BsA/xHb6Znz04pdFrZ
8m17osc7pqV7Diu3lM/GZfK80F64ttpA152M0ztLb6i+b4EBfC4DkJkB6ONccGIa
W8Jyj6f+Pzhd2E3pLQIDAQAB root@SSH-1

Then collect all  text for add another server. Goto Server 2 and create authorized_keys file and then insert all authorized_keys from Server 1.

Now create full permission .ssh directory and authorized_keys file.

root@SSH-1:~# chmod 755 .ssh

Setup permission authorized_keys file.

root@SSH-1:~/.ssh# chmod 755 authorized_keys

Service ssh restart command or your server reboot needed.

root@SSH-2:~#  service ssh restart

Server -2 configuration for enable ssh without password authentication

root@SSH-2:~# mkdir .ssh

Goto .ssh/ folder

root@SSH-2:~# cd .ssh/

Run ssh-keygen command

root@SSH-2:~/.ssh# ssh-keygen

Press Enter four times. See as like below image.

root@SSH-2:~/.ssh# cat id_rsa.pub

See example below:

MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDO2DJevIWe2tKnlK8ffJaPcuQn
48Ydhm8GlXP8Rdb2GleX32ib7aJo/tc35+yUqGkkJ7edzRAThnnC88q4KXTTPIYQ
gzFyQ8DICOiFmbAtIK8yT8OlLkC8ZzROFyeh3mwfS1UxsSi5Sba/8e76nzGQ45nn
1eYnk+diWM8I46U84QIDAQAB  root@SSH-2

Then collect all  text for add another server. Goto Server 1 and create authorized_keys file and then insert all authorized_keys from Server 2.

Now create full permission .ssh directory and authorized_keys file.

root@SSH-2:~# chmod 755 .ssh

Setup permission authorized_keys file.

root@SSH-2:~/.ssh# chmod 755 authorized_keys

ssh service restart or server reboot needed.

root@SSH-2:~# service ssh restart

Test from Server -2 

root@SSH-2:~# ssh -l root 10.66.50.1

Write Yes then press Enter. Now login Server -1 from Server -2 without password authentication.

Goto Server -1 for test.

root@SSH-1:~# ssh -l root 10.66.50.2

Write Yes then press Enter. Now login Server -2 from Server -1 without password authentication.

Now ready for main task mysql DB replication.

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