AWS EC2 Machine

Remote access with key pairs

First step: 

Local machine generate public key: 

test -f ~/.ssh/id_rsa.pub && cat ~/.ssh/id_rsa.pub || 

ssh-keygen -t rsa -C "my@example.com" && cat ~/.ssh/id_rsa.pub

Save key without any formatting

Second step:

Create a new account and add the newly created account to the sudo(admin) group:

- useradd user_name -m -s /bin/bash -c 'admin user' && usermod -aG sudo user_name

Let users who are in sudo group no need to enter password when switching to root:

visudo
%sudo ALL=(ALL:ALL) NOPASSWD: ALL

Then, shift user to new user

# sudo su - user_name

Last step: put local public key to remote’s account:

steven2@remote $ mkdir ~/.ssh \
&& chmod 700 ~/.ssh \
&& touch ~/.ssh/authorized_keys \
&& chmod 600 ~/.ssh/authorized_keys \
&& vim ~/.ssh/authorized_keys

ctrl+ins command to paste the public key from local machine

esc + : + w
esc + : + q

Then, locally start connection: 

mosh user_name@public_dns