How To Install Free SSL Certificate for Nginx on CentOS 8

Install Free SSL Certificate for Nginx on CentOS 8

In this tutorial, we will show you how to install free SSL Certificates for Nginx on CentOS 8. For those of you who didn’t know, Let’s Encrypt is a free open certificate authority (CA) that provides free certificates for websites and other services. The service, which is backed by the Electronic Frontier Foundation, Mozilla, Cisco Systems, and Akamai.

This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple and assumes you are running in the root account, if not you may need to add ‘sudo‘ to the commands to get root privileges. I will show you through the step-by-step installation Free SSL Certificate for Nginx on CentOS 8 server.

Install Free SSL Certificate for Nginx on CentOS 8

Step 1. First, let’s start by ensuring your system is up-to-date.

dnf update

Step 2. Installing Certbot on CentOS 8.

Run these commands on the command line on the machine to install Certbot:

wget https://dl.eff.org/certbot-auto
sudo mv certbot-auto /usr/local/bin/certbot-auto
sudo chown root /usr/local/bin/certbot-auto
sudo chmod 0755 /usr/local/bin/certbot-auto

Then, run this command to get a certificate and have Certbot edit your Nginx configuration automatically:

sudo /usr/local/bin/certbot-auto --nginx

The result like below:

Creating virtual environment...
Installing Python packages...
Installation succeeded.
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator nginx, Installer nginx
Enter email address (used for urgent renewal and security notices) (Enter 'c' to
cancel): [email protected]

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Please read the Terms of Service at
https://letsencrypt.org/documents/LE-SA-v1.2-November-15-2017.pdf. You must
agree in order to register with the ACME server at
https://acme-v02.api.letsencrypt.org/directory
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(A)gree/(C)ancel: A

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Would you be willing to share your email address with the Electronic Frontier
Foundation, a founding partner of the Let's Encrypt project and the non-profit
organization that develops Certbot? We'd like to send you email about our work
encrypting the web, EFF news, campaigns, and ways to support digital freedom.
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(Y)es/(N)o: Y

Which names would you like to activate HTTPS for?
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1: your-domain-a.com
2: your-domain-b.com
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Select the appropriate numbers separated by commas and/or spaces, or leave input
blank to select all options shown (Enter 'c' to cancel): 1
Obtaining a new certificate
Performing the following challenges:
http-01 challenge for your-domain-a.com
Waiting for verification...
Cleaning up challenges
Deploying Certificate to VirtualHost /etc/nginx/conf.d/your-domain-a.com.conf

Please choose whether or not to redirect HTTP traffic to HTTPS, removing HTTP access.
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1: No redirect - Make no further changes to the webserver configuration.
2: Redirect - Make all requests redirect to secure HTTPS access. Choose this for
new sites, or if you're confident your site works on HTTPS. You can undo this
change by editing your web server's configuration.
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Select the appropriate number [1-2] then [enter] (press 'c' to cancel): 2
Redirecting all traffic on port 80 to ssl in /etc/nginx/conf.d/your-domain-a.com.conf

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Congratulations! You have successfully enabled https://your-domain-a.com

You should test your configuration at:
https://www.ssllabs.com/ssltest/analyze.html?d=your-domain-a.com
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IMPORTANT NOTES:
 - Congratulations! Your certificate and chain have been saved at:
   /etc/letsencrypt/live/your-domain-a.com/fullchain.pem
   Your key file has been saved at:
   /etc/letsencrypt/live/your-domain-a.com/privkey.pem
   Your cert will expire on 2020-01-12. To obtain a new or tweaked
   version of this certificate in the future, simply run certbot-auto
   again with the "certonly" option. To non-interactively renew *all*
   of your certificates, run "certbot-auto renew"
 - Your account credentials have been saved in your Certbot
   configuration directory at /etc/letsencrypt. You should make a
   secure backup of this folder now. This configuration directory will
   also contain certificates and private keys obtained by Certbot so
   making regular backups of this folder is ideal.
 - If you like Certbot, please consider supporting our work by:

   Donating to ISRG / Let's Encrypt:   https://letsencrypt.org/donate
   Donating to EFF:                    https://eff.org/donate-le

Step 3. Certbot Auto-Renew Cron Job.

Let’s Encrypt SSL certificates that will get expired after 90 days of installation and you must renew it before it gets expired. If you have installed certificates using certbot then it must have already created cronjob to auto-renew certificates:

echo "0 0,12 * * * root python -c 'import random; import time; time.sleep(random.random() * 3600)' && /usr/local/bin/certbot-auto renew" | sudo tee -a /etc/crontab > /dev/null

Congratulations! You have successfully installeded free SSL Certificates. Thanks for using this tutorial for install Let’s Encrypt SSL Certificates on CentOS 8 system. For additional help or useful information, we recommend you to check the official Let’s Encrypt website.

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