setup password less connectivity between two Linux server using ssh-keygen

setup password less connectivity between two Linux server  

-bash-4.2$

-bash-4.2$ ssh-keygen

Generating public/private rsa key pair.

Enter file in which to save the key (/var/lib/pgsql/.ssh/id_rsa):

Created directory '/var/lib/pgsql/.ssh'.

Enter passphrase (empty for no passphrase):

Enter same passphrase again:

Your identification has been saved in /var/lib/pgsql/.ssh/id_rsa.

Your public key has been saved in /var/lib/pgsql/.ssh/id_rsa.pub.

The key fingerprint is:

SHA256:XHvRME2FNaXO6wAHk1wjPpjdzHwAJX6RY7yrvSfm7/g postgres@ip-172-31-86-192.ec2.internal

The key's randomart image is:

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

|          ++O+.==|

|         B X=Bo..|

|        o @.Bo+  |

|       . . *.=   |

|        S o o.o  |

|           +.  . |

|           o. .  |

|          . ++.  |

|           o+BE  |

+----[SHA256]-----+

-bash-4.2$

-bash-4.2$

-bash-4.2$

-bash-4.2$

-bash-4.2$

-bash-4.2$ ssh-copy-id postgres@172.31.85.11

/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/var/lib/pgsql/.ssh/id_rsa.pub"

/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

postgres@172.31.85.11's password:

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh 'postgres@172.31.85.11'"

and check to make sure that only the key(s) you wanted were added.

-bash-4.2$

try to test the login :

-bash-4.2$ ssh 172.31.85.11

Last login: Tue Dec 27 10:41:27 2022

       __|  __|_  )

       _|  (     /   Amazon Linux 2 AMI

      ___|\___|___|

https://aws.amazon.com/amazon-linux-2/

-bash-4.2$

-bash-4.2$