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Adding Another SSH enabled User to OCI Host

Prerequisites

Make sure to generate the SSH key Pair, ignore if already done

Adding Another SSH enabled User

First login as initial user (opc) to the instance

login as: opc
Authenticating with public key "" from agent
Last login: Thu Jul 11 09:50:56 2019 from xyz.com

Become the root user

[opc@bastion ~]$ sudo su -
Last login: Thu Jul 11 08:49:01 GMT 2019 on pts/0

We are adding new user nadeemoh

[root@frqabas001 ~]# useradd -m -d /home/nadeemoh -s /bin/bash nadeemoh

[root@frqabas001 ~]# mkdir -p /home/nadeemoh/.ssh
[root@frqabas001 ~]# touch /home/nadeemoh/.ssh/authorized_keys

[root@frqabas001 ~]# chown -R nadeemoh:nadeemoh /home/nadeemoh/
[root@frqabas001 ~]# chmod 700 /home/nadeemoh/.ssh
[root@frqabas001 ~]# chmod 600 /home/nadeemoh/.ssh/authorized_keys

copy your public key

nadeemoh@NADEEMOH-LAP MINGW64 ~
$ cd .ssh

nadeemoh@NADEEMOH-LAP MINGW64 ~/.ssh
$ ls
backup/  id_rsa  id_rsa.pub  known_hosts

nadeemoh@NADEEMOH-LAP MINGW64 ~/.ssh
$ clip < id_rsa.pub

nadeemoh@NADEEMOH-LAP MINGW64 ~/.ssh
$

And add to the following file

[root@frqabas001 ~]# vim /home/nadeemoh/.ssh/authorized_keys

Testing

[opc@frqabas001 ~]$ sudo su - nadeemoh
[nadeemoh@frqabas001 ~]$ pwd
/home/nadeemoh
[nadeemoh@frqabas001 ~]$

Enable sudo privileges for new user

In /etc/sudoers, look for:

# %wheel        ALL=(ALL)       NOPASSWD: ALL

Add the following line immediately after above line

%nadeemoh  ALL=(ALL)       NOPASSWD: ALL

Verify

[root@frqabas001 ~]# sudo su - nadeemoh
Last login: Thu Jul 11 09:51:11 GMT 2019 on pts/0
[nadeemoh@frqabas001 ~]$ sudo su -
Last login: Thu Jul 11 09:52:32 GMT 2019 on pts/0
[root@frqabas001 ~]#

Now login to instance using new user and private key

All Commands

useradd -m -d /home/username -s /bin/bash username
mkdir -p /home/username/.ssh
touch /home/username/.ssh/authorized_keys
chown -R username:username /home/username/
chmod 700 /home/username/.ssh
chmod 600 /home/username/.ssh/authorized_keys
vim /home/username/.ssh/authorized_keys