Certbot and HTTPS

Once you have a website, it is extremely important to enable encrypted connections over HTTPS/SSL. You might have no idea what that means, but it's easy to do how we've already set our server up.

Certbot is a program that automatically creates and deploys the certificates that allow encrypted connections. It used to be a pain (and often expensive) to do this, but now it's all free and automatic.

Why is encryption important?

Let's do it!

Note in this picture that a browser accessing your site will say "Not secure" or something else to notify you that we are using and unencrypted HTTP connection rather than an encrypted HTTPS one.

Installation

Just run:

apt install python3-certbot-nginx

And this will install certbot and its module for nginx.

Run

As I mentioned in the previous article, firewalls might interfere with certbot, so you will want to either disable your firewall or at least ensure that it allows connections on ports 80 and 443:

ufw allow 80
ufw allow 443

Now let's run certbot:

certbot --nginx

The command will ask you for your email. This is so when the certificates need to be renewed in three months, you will get a email about it. You can set the certificates to renew automatically, but it's a good idea to check it the first time to ensure it renewed properly. You can avoid giving your email by running the command with the --register-unsafely-without-email option as well.

Agree to the terms, and optionally consent to give your email to the EFF (I recommend against this obviously).

Once all that is done, it will ask you what domains you want a certificate for. You can just press enter to select all.

It will take a moment to create the certificate, but afterwards, you will be asked if you want to automatically redirect all connections to be encrypted. Since this is preferable, choose 2 to Redirect.

Checking for success

You should now be able to go to your website and see that there is a lock icon or some other notification that you are now on an encrypted connection.

Setting up certificate renewal

As I mentioned in passing, the Certbot certificates last for 3 months. To renew certificates, you just have to run certbot --nginx renew and it will renew any certificates close to expiry.

Of course, you don't want to have to remember to log in to renew them every three months, so it's easy to tell the server to automatically run this command. We will use a cronjob for this. Run the following command:

crontab -e

This crontab command will open up a file for editing. A crontab is a list of commands that your operating system will run automatically at certain times. We are going to tell it to automatically try to renew our certificates every month so we never have to.

Create a new line at the end of the file and add this content:

0 0 1 * * certbot --nginx renew

Save the file and exit to activate this cronjob.

For more on cron and crontabs please click here!

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