26 April 2022

How To Create a Self-Signed SSL Certificate for Apache in Ubuntu 22.04


TLS, or “transport layer security” — and its predecessor SSL — are protocols used to wrap normal traffic in a protected, encrypted wrapper. Using this technology, servers can safely send information to their clients without their messages being intercepted or read by an outside party.

In this guide, you will create and use a self-signed TLS certificate with the Apache web server on Ubuntu 22.04. You’ll use the openssl command line tool to create the certificate, and then you will configure Apache to use it.

<$>[note] Note: A self-signed certificate will encrypt communication between your server and any clients. However, because it is not signed by any of the trusted certificate authorities included with web browsers and operating systems, users cannot use the certificate to validate the identity of your server automatically. As a result, your users will see a security error when visiting your site.

Because of this limitation, self-signed certificates are not appropriate for a production environment serving the public. They are typically used for testing, or for securing non-critical services used by a single user or a small group of users that can establish trust in the certificate’s validity through alternate communication channels.

For a more production-ready certificate solution, check out Let’s Encrypt, a free certificate authority. You can learn how to download and configure a Let’s Encrypt certificate in our How To Secure Apache with Let’s Encrypt on Ubuntu 22.04 tutorial. <$>


Before starting this tutorial, you’ll need the following:

  • Access to a Ubuntu 22.04 server with a non-root, sudo-enabled user. Our Initial Server Setup with Ubuntu 22.04 guide can show you how to create this account.

  • You will also need to have Apache installed. You can install Apache using apt. First, update the local package index to reflect the latest upstream changes:

    sudo apt update

    Then, install the apache2 package:

    sudo apt install apache2

    And finally, if you have a ufw firewall set up, open up the http and https ports:

    sudo ufw allow "Apache Full"

After these steps are complete, be sure you are logged in as your non-root user and continue with the tutorial.

Step 1 — Enabling mod_ssl

Before you can use any TLS certificates, you’ll need to first enable mod_ssl, an Apache module that provides support for SSL encryption.

Enable mod_ssl with the a2enmod command:

sudo a2enmod ssl

Restart Apache to activate the module:

sudo systemctl restart apache2

The mod_ssl module is now enabled and ready for use.

Step 2 – Creating the TLS Certificate

Now that Apache is ready to use encryption, we can move on to generating a new TLS certificate. The certificate will store some basic information about your site, and will be accompanied by a key file that allows the server to securely handle encrypted data.

We can create the TLS key and certificate files with the openssl command:

sudo openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout /etc/ssl/private/apache-selfsigned.key -out /etc/ssl/certs/apache-selfsigned.crt

After you enter the command, you will be taken to a prompt where you can enter information about your website. Before we go over that, let’s take a look at what is happening in the command we are issuing:

  • openssl: This is the command line tool for creating and managing OpenSSL certificates, keys, and other files.
  • req -x509: This specifies that we want to use X.509 certificate signing request (CSR) management. X.509 is a public key infrastructure standard that TLS adheres to for key and certificate management.
  • -nodes: This tells OpenSSL to skip the option to secure our certificate with a passphrase. We need Apache to be able to read the file, without user intervention, when the server starts up. A passphrase would prevent this from happening, since we would have to enter it after every restart.
  • -days 365: This option sets the length of time that the certificate will be considered valid. We set it for one year here. Many modern browsers will reject any certificates that are valid for longer than one year.
  • -newkey rsa:2048: This specifies that we want to generate a new certificate and a new key at the same time. We did not create the key that is required to sign the certificate in a previous step, so we need to create it along with the certificate. The rsa:2048 portion tells it to make an RSA key that is 2048 bits long.
  • -keyout: This line tells OpenSSL where to place the generated private key file that we are creating.
  • -out: This tells OpenSSL where to place the certificate that we are creating.

Fill out the prompts appropriately. The most important line is the one that requests the Common Name. You need to enter either the hostname you’ll use to access the server by, or the public IP of the server. It’s important that this field matches whatever you’ll put into your browser’s address bar to access the site, as a mismatch will cause more security errors.

The full list of prompts will look something like this:

Country Name (2 letter code) [XX]:<^>US<^>
State or Province Name (full name) []:<^>Example<^>
Locality Name (eg, city) [Default City]:<^>Example <^>
Organization Name (eg, company) [Default Company Ltd]:<^>Example Inc<^>
Organizational Unit Name (eg, section) []:<^>Example Dept<^>
Common Name (eg, your name or your server's hostname) []:<^>your_domain_or_ip<^>
Email Address []:<^>webmaster@example.com<^>

Both of the files you created will be placed in the appropriate subdirectories under /etc/ssl.

Next we will update our Apache configuration to use the new certificate and key.

Step 3 – Configuring Apache to Use TLS

Now that we have our self-signed certificate and key available, we need to update our Apache configuration to use them. On Ubuntu, you can place new Apache configuration files (they must end in .conf) into /etc/apache2/sites-available/and they will be loaded the next time the Apache process is reloaded or restarted.

For this tutorial we will create a new minimal configuration file. (If you already have an Apache <Virtualhost> set up and just need to add TLS to it, you will likely need to copy over the configuration lines that start with SSL, and switch the VirtualHost port from 80 to 443. We will take care of port 80 in the next step.)

Open a new file in the /etc/apache2/sites-available directory:

sudo nano /etc/apache2/sites-available/<^>your_domain_or_ip<^>.conf

Paste in the following minimal VirtualHost configuration:

[label /etc/apache2/sites-available/your_domain_or_ip.conf]
<VirtualHost *:443>
   ServerName <^>your_domain_or_ip<^>
   DocumentRoot /var/www/<^>your_domain_or_ip<^>

   SSLEngine on
   SSLCertificateFile /etc/ssl/certs/apache-selfsigned.crt
   SSLCertificateKeyFile /etc/ssl/private/apache-selfsigned.key

Be sure to update the ServerName line to however you intend to address your server. This can be a hostname, full domain name, or an IP address. Make sure whatever you choose matches the Common Name you chose when making the certificate.

The remaining lines specify a DocumentRoot directory to serve files from, and the TLS options needed to point Apache to our newly-created certificate and key.

Now let’s create our DocumentRoot and put an HTML file in it just for testing purposes:

sudo mkdir /var/www/<^>your_domain_or_ip<^>

Open a new index.html file with your text editor:

sudo nano /var/www/<^>your_domain_or_ip<^>/index.html

Paste the following into the blank file:

[label /var/www/your_domain_or_ip/index.html]
<h1>it worked!</h1>

This is not a full HTML file, of course, but browsers are lenient and it will be enough to verify our configuration.

Save and close the file Next, we need to enable the configuration file with the a2ensite tool:

sudo a2ensite <^>your_domain_or_ip<^>.conf

Next, let’s test for configuration errors:

sudo apache2ctl configtest

If everything is successful, you will get a result that looks like this:

[secondary_label Output]
AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using Set the 'ServerName' directive globally to suppress this message
Syntax OK

The first line is a message telling you that the ServerName directive is not set globally. If you want to get rid of that message, you can set ServerName to your server’s domain name or IP address in /etc/apache2/apache2.conf. This is optional as the message will do no harm.

If your output has Syntax OK in it, your configuration file has no syntax errors. We can safely reload Apache to implement our changes:

sudo systemctl reload apache2

Now load your site in a browser, being sure to use https:// at the beginning.

You should see an error. This is normal for a self-signed certificate! The browser is warning you that it can’t verify the identity of the server, because our certificate is not signed by any of its known certificate authorities. For testing purposes and personal use this can be fine. You should be able to click through to advanced or more information and choose to proceed.

After you do so, your browser will load the it worked! message.

<$>[note] Note: if your browser doesn’t connect at all to the server, make sure your connection isn’t being blocked by a firewall. If you are using ufw, the following commands will open ports 80 and 443:

 sudo ufw allow "Apache Full"


Next we will add another VirtualHost section to our configuration to serve plain HTTP requests and redirect them to HTTPS.

Step 4 — Redirecting HTTP to HTTPS

Currently, our configuration will only respond to HTTPS requests on port 443. It is good practice to also respond on port 80, even if you want to force all traffic to be encrypted. Let’s set up a VirtualHost to respond to these unencrypted requests and redirect them to HTTPS.

Open the same Apache configuration file we started in previous steps:

sudo nano /etc/apache2/sites-available/<^>your_domain_or_ip<^>.conf

At the bottom, create another VirtualHost block to match requests on port 80. Use the ServerName directive to again match your domain name or IP address. Then, use Redirect to match any requests and send them to the TLS VirtualHost. Make sure to include the trailing slash:

[label /etc/apache2/sites-available/your_domain_or_ip.conf]
<VirtualHost *:80>
	ServerName <^>your_domain_or_ip<^>
	Redirect / https://<^>your_domain_or_ip<^>/

Save and close this file when you are finished, then test your configuration syntax again, and reload Apache:

sudo apachectl configtest
sudo systemctl reload apache2

You can test the new redirect functionality by visiting your site with plain http:// in front of the address. You should be redirected to https:// automatically.


You have now configured Apache to serve encrypted requests using a self-signed TLS certificate, and to redirect unencrypted HTTP requests to HTTPS.

If you are planning on using TLS for a public website, you should look into purchasing a domain name and using a widely supported certificate authority such as Let’s Encrypt.

For more information on using Let’s Encrypt with Apache, please read our How To Secure Apache with Let’s Encrypt on Ubuntu 22.04 tutorial.