SSH configuration for Remote Connection

The following steps will show how to config ssh connection.

• generate the ssh keys with PEM format with a provided filename

$ ssh-keygen -t rsa -P "" -m PEM -f filename

• generate the ssh keys in .ssh directory

$ ssh-keygen -t rsa -P ""

• add a new remote host configuration
  Let’s assume that we have the following host IP and username on a remote server
  IP: 192.168.64.2
  user: ubuntu

$ cd ~/.ssh
$ touch config

Add the following contents in the config file.

Host ubuntu
    Hostname 192.168.64.2
    User ubuntu

• configure the authorization in a remote server

copy the public key from the local host. You can find the public key from the below command.

$ cat ~/.ssh/id_rsa.pub
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC9vmTjzHpBVLZMn5IlFs/DOIIjZWUUDh0ohewfA6cDpAxpZI3QjR07pmU7xU6qny1vLokl19hi0sMpVUKYsX/c8gmgoxCjRK0SQcxICnLy4UTu6aNRHrONRsnd+z/JiEI0JMSU4gTKaS1GYyuWLB7fHHiT8OmmuleKOC18SXyOIi1CKjInt7E1omSf2ezbYVl7qpeA1ywHcER5OSVrNxntQTtAVuR6i/dZi3aUvTT8S2w7CeWJLcKw21l9EieAXh1Nn/hQVBUrDUCfSl4GTwS2cfKW4F3gS8JH/5xS3z53ABKkljxEOUou1kLZTUHoyxOaw9EGL/9mFwdmVlOynbNt OpenShift-Key

connect the remote server and change the directory to .ssh

$ ssh ubunto@192.168.64.2
$ cd .ssh

if authorized_keys file does not exist, you can create it with a touch command

$ touch authorized_keys

copy the public key in the authorized_keys file. you will see the following item once you copied it correctly.

$ cat authorized_keys
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC9vmTjzHpBVLZMn5IlFs/DOIIjZWUUDh0ohewfA6cDpAxpZI3QjR07pmU7xU6qny1vLokl19hi0sMpVUKYsX/c8gmgoxCjRK0SQcxICnLy4UTu6aNRHrONRsnd+z/JiEI0JMSU4gTKaS1GYyuWLB7fHHiT8OmmuleKOC18SXyOIi1CKjInt7E1omSf2ezbYVl7qpeA1ywHcER5OSVrNxntQTtAVuR6i/dZi3aUvTT8S2w7CeWJLcKw21l9EieAXh1Nn/hQVBUrDUCfSl4GTwS2cfKW4F3gS8JH/5xS3z53ABKkljxEOUou1kLZTUHoyxOaw9EGL/9mFwdmVlOynbNt OpenShift-Key

• connect the remote server
  Now, you can connect the remote server with the following command. It will not ask you user/password anymore.

$ ssh ubuntu

You can find more details about ssh config example from the below link.

SSH config