How to configure ssh password on AWS

Question

How to configure an ssh password between nodes in an AWS cluster

Answer 1

The following steps for setting a password with less authentication have been thoroughly tested for Centos and Ubuntu.

Assumptions:

• You already have access to your EC2 machine. The pem key may be used, or you have credentials for a unix user who has root privileges.
• You already have RSA keys installed on your local computer. The private key and public key are available on "~ / .ssh / id_rsa" and "~ / .ssh / id_rsa.pub" respectively.

Steps:

• Log in to EC2 as root.

• Create a new user

  useradd -m <yourname> sudo su <yourname> cd mkdir -p ~/.ssh touch ~/.ssh/authorized_keys 

  Add the contents of the ~ / .ssh / id_rsa.pub file on the local computer to ~ / .ssh / authorized_keys on the EC2 machine.

   chmod -R 700 ~/.ssh chmod 600 ~/.ssh/* 

• Make sure the device is sshing enabled. In the / etc / ssh / sshd _config file, verify that the line containing "PasswordAuthentication yes" is uncommented. Restart the sshd service if you make any changes to this file:

   service sshd restart # On Centos service ssh restart # On Ubuntu 

• Now your login without a password should work. Try the following steps on your local computer:

   ssh -A <yourname>@ec2-xx-xx-xxx-xxx.ap-southeast-1.compute.amazonaws.com 

• Make yourself superuser. Open /etc/sudoers . Make sure the following two lines are uncommented:

   ## Allows people in group wheel to run all commands %wheel ALL=(ALL) ALL ## Same thing without a password %wheel ALL=(ALL) NOPASSWD: ALL 

  Add yourself to the wheel group.

   usermod -aG wheel <yourname> 

Answer 2

It may help someone

Copy the pem file on the machine, then copy the contents of the pem file to the .ssh / id_rsa file, which you can use with the command below or your own

 cat my.pem > ~/.ssh/id_rsa 

try ssh localhost, it should work with other machines in the cluster

Answer 3

you can use ssh keys as described here: http://pkeck.myweb.uga.edu/ssh/