Add New Ssh User.md

Add New Ssh User

Add new general user

You can add new general user by this command

adduser username

You will see new folder with file authorized_keys in /home/username/.ssh

Granted root permission

To avoid insufficient authority type

user mod -aG sudo username

Create ssh key

These operates are on your client not your server, type

ssh-keygen -t rsa

to create two ssh files. For mac user you will see new file id_rsa and id_rsa.pub under /Users/username/.ssh

For windows user its always under C:\Users\username\.ssh

Trensfor ssh file

create new folder .ssh under /home/username

mkdir .ssh

Transfer id-rsa to your server under /home/username/.ssh by scp (secure copy) . For example

scp \xxx\xxx\id_rsa remote_username@remote_ip:remote_file_or_folder

Then delete the original file authorized_keys by rm authorized_keys and rename your id_rsa file

mv id_rsa authorized_keys

Modify permission

So far you will see this information use commond ll

-rw------- 1 root root 416 Jan 14 11:41 authorized_keys

It means the owner is root. You have to modify file's read and write permission

chmod 700 .ssh

chmod 600 .ssh/authorized_keys

cd .. under /home then

chmod 770 username

Edit configuration file

Back to the client under /Users/username/.ssh, add new file

sudo vim config

Type the following

Host server
    HostName xxx.xx.xxx.xx
    Port 22
    User username
    LocalForward 30572 xxx.xxx.x.x:3372
    IdentityFile ~/.ssh/id_rsa

Connect to server

ssh username@remote_ip

You will enter your username path

sudo su

Then enter the password, you will enter the root dictionary~