How to install free SSL with Let’s Encrypt?

You can automatically enable HTTPS on your website with EFF's Certbot, deploying Let's Encrypt certificates

Apache on CentOS/RHEL 7

To use Certbot, you must first  enable the EPEL repository

Note : If you are using RHEL on EC2, you can enable the optional channel by running:

[email protected]:~# yum -y install yum-utils ; yum-config-manager --enable rhui-REGION-rhel-server-extras rhui-REGION-rhel-server-optional 

After doing this, you can install Certbot by running:  

[email protected]:~# sudo yum install python2-certbot-apache   

Apache on Ubuntu

 
On Ubuntu systems, the Certbot team maintains a  PPA . Once you add it to your list of repositories all you'll need to do is apt-get the following packages.
 

$ sudo apt-get update

$ sudo apt-get install software-properties-common

$ sudo add-apt-repository ppa:certbot/certbot

$ sudo apt-get update $ sudo apt-get install python-certbot-apache

 

Get Started

 
 
Running this command will get a certificate for you and have Certbot edit your Apache configuration automatically to serve it.
 

[email protected]:~# sudo certbot --apache

 
 If you're feeling more conservative and would like to make the changes to your Apache configuration by hand, you can use the   certonly    subcommand:
 

[email protected]:~# sudo certbot --apache certonly 

 
Automating renewal
 
Certbot can be configured to renew your certificates automatically before they expire. Since Let's Encrypt certificates last for 90 days, it's highly advisable to take advantage of this feature. You can test automatic renewal for your certificates by running this command:
 

[email protected]:~# sudo certbot renew --dry-run

 
If that appears to be working correctly, you can arrange for automatic renewal by adding a  cron job  or  systemd timer   which runs the following:
 

[email protected]:~# certbot renew 

 
More detailed information can be found in Certbot documentation
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