By Theo B and Kathleen Juell
Webmin is a modern web control panel for any Linux machine that allows you to administer your server through a simple interface. With Webmin, you can change settings for common packages on the fly.
In this tutorial, you’ll install and configure Webmin on your server and secure access to the interface with a valid certificate using Let’s Encrypt. You’ll then use Webmin to add new user accounts, and update all packages on your server from the dashboard.
To complete this tutorial, you will need:
First, we need to add the Webmin repository so that we can easily install and update Webmin using our package manager. We do this by adding the repository to the
Open the file in your editor:
- sudo nano /etc/apt/sources.list
Then add this line to the bottom of the file to add the new repository:
. . . deb http://download.webmin.com/download/repository sarge contrib
Save the file and exit the editor.
Next, add the Webmin PGP key so that your system will trust the new repository:
wget http://www.webmin.com/jcameron-key.asc sudo apt-key add jcameron-key.asc
Next, update the list of packages to include the Webmin repository:
- sudo apt update
Then install Webmin:
- sudo apt install webmin
Once the installation finishes, you’ll be presented with the following output:
OutputWebmin install complete. You can now login to https://your_server_ip:10000 as root with your root password, or as any user who can use `sudo`.
Please copy down this information, as you will need it for the next step.
Note: If you installed
ufw during the prerequisite step, you will need to run the command
sudo ufw allow 10000 in order to allow Webmin through the firewall. For extra security, you may want to configure your firewall to only allow access to this port from certain IP ranges.
Let’s secure access to Webmin by adding a valid certificate.
Webmin is already configured to use HTTPS, but it uses a self-signed, untrusted certificate. Let’s replace it with a valid certificate from Let’s Encrypt.
https://your_domain:10000 in your web browser, replacing
your_domain with the domain name you pointed at your server.
Note: When logging in for the first time, you will see an “Invalid SSL” error. This is because the server has generated a self-signed certificate. Allow the exception to continue so you can replace the self-signed certificate with one from Let’s Encrypt.
You’ll be presented with a login screen. Sign in with the non-root user you created while fulfilling the prerequisites for this tutorial.
Once you log in, the first screen you will see is the Webmin dashboard. Before you can apply a valid certificate, you have to set the server’s hostname. Look for the System hostname field and click on the link to the right, as shown in the following figure:
This wil take you to the Hostname and DNS Client page. Locate the Hostname field, and enter your Fully-Qualified Domain Name into the field. Then press the Save button at the bottom of the page to apply the setting.
After you’ve set your hostname, click on Webmin on the left navigation bar, and then click on Webmin Configuration.
Then, select SSL Encryption from the list of icons, and then select the Let’s Encrypt tab. You’ll see a screen like the following figure:
Using this screen, you’ll tell Webmin how to obtain and renew your certificate. Let’s Encrypt certificates expire after 3 months, but we can instruct Webmin to automatically attempt to renew the Let’s Encrypt certificate every month. Let’s Encrypt looks for a verification file on our server, so we’ll configure Webmin to place the verification file inside the folder
/var/www/html, which is the folder that the Apache web server you configured in the prerequisites uses. Follow these steps to set up your certificate:
1into the input box, and selecting the radio button to the left of the input box.
To use the new certificate, restart Webmin by clicking the back arrow in your browser, and clicking the Restart Webmin button. Wait around 30 seconds, and then reload the page and log in again. Your browser should now indicate that the certificate is valid.
You’ve now set up a secured working instance of Webmin. Let’s look at how to use it.
Webmin has many different modules that can control everything from the BIND DNS Server to something as simple as adding users to the system. Let’s look at how to create a new user, and then explore how to update the operating system using Webmin.
Let’s explore how to manage the users and groups on your server.
First, click the System tab, and then click the Users and Groups button. Then, from here, you can either add a user, manage a user, or add or manage a group.
Let’s create a new user called deploy which can be used for hosting web applications. To add a user, click Create a new user, which is located at the top of the users table. This displays the Create User screen, where you can supply the username, password, groups and other options. Follow these instructions to create the user:
When creating a user, you can set options for password expiry, the user’s shell, and whether or not they are allowed a home directory.
Next, let’s look at how to install updates to our system.
Webmin lets you update all of your packages through its user interface. To update all of your packages, first, go to the Dashboard link, and then locate the Package updates field. If there are updates available, you’ll see a link that states the number of available updates, as shown in the following figure:
Click this link, and then press Update selected packages to start the update. You may be asked to reboot the server, which you can also do through the Webmin interface.
You now have a secured working instance of Webmin and you’ve used the interface to create a user and update packages. Webmin gives you access to many things you’d normally need to access through the console, and it organizes them in an intuitive way. For example, if you have Apache installed, you would find the configuration tab for it under Servers, and then Apache.
Explore the interface, or read the Official Webmin wiki to learn more about managing your system with Webmin.
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