Step by step to setup Ubuntu Server and configure the initial users and security for the server.
Update Root Password
The very first thing that you should do is change your root password.
Enter the following command
you will be asked to enter your root password . You should choose a strong password for your root user.
Step 1 -Create New User
We will create a new user with root privileges. Root account will then be disabled
Enter the following command and using the account name of your choice
You will be asked to enter password
Now give root privileges to new user
|usermod -aG sudo youradminuser|
Step 2 -Create Private Key Pair
The private key will be used to unlock access from any device that needs it. The Public Key will be on the server.
Choose the default for the file location.
If you want extra security you can add a passphrase
Once your keys have been created, you will find them in /home/root/.ssh – there should be id_rsa (private key) and id_rsa.pub (public key) files in that directory.
|ssh-copy-id youradminuser@[server IP]|
Yes to continue and enter password for youradminuser
Step 3 -Configure SSH Settings
Edit SSH configuration file
|nano -w /etc/ssh/sshd_config|
Edit default port number
Change to new port number (You can use any port number)
Now disable password Authentication
Press CTRL+X followed by ‘Y’ and ‘Enter’ to save and exit.
|systemctl reload sshd|
Step 4 -Download Private Key
Select the entire contents and press CTRL+INS to copy
Paste the file into Notepad and save it to a secure location
and delete the id_rsa file from the server
Step 5 -Convert Private Key Format
You need to convert it to .PPK format.
First, run PuTTYgen and click the ‘Load’ button. Browse to the private key file that you saved in step 7.
When browsing for your private key, change the file type you are searching for from ‘PuTTY Private Key Files (*.ppk)’ to ‘All Files (*.*).’
Open your private key file, and you should receive a notice that the private key was successfully imported.
Click OK to get off of this notification.
Now, click the ‘Save private key’ button and save your private key as a .ppk file
(I usually just use the same directory that I used to save the original private key).
You can now close PuTTYgen.