Install a free SSL certificate Let's Encrypt for Tomcat Server on Ubuntu

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1- What is Let's Encrypt?

An SSL of a website need to be recognized by a reputable organization that it is safe, which is the reason why you have to use money to buy a Certificate from a reputable organization. There are many reputable organizations in the world that offer SSL certificates such as Comodo, GeoTrust, ...

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Let's Encrypt is a  SSL certificate providers  free, automatically and operating for the community's benefits. It is managed by  Internet Security Research Group (ISRG).
Let's Encrypt provides SSL certificates, type: Domain Validation, ie after installation, there will be a green lock in the address bar of the browser, when users access your website
Although the  SSL certificates of  Let's Encryt is free, it only has a valid term of 3 months, so every 3 months, you have to create this certificate. But it is very simple, therefore, it doesn't also cause you much trouble for you.
In this post, I am going to guide you to create a  SSL certificate free of   Let's Encrypt in the  Linux & Tomcat Server environment.

2- Create a SSL Let's Encrypt certificate

Ensure that you have installed  TomCat successfully on​​​​​​​ Linux (Ubuntu Server,..).
Deploy your application on Tomcat Server and access it successfully through your domain (eg.: 

Install Certbot

Certbot is a small tool, which helps you to create keys and signs (Signature) of SSL certificate, and automatically register with Let's Encrypt organization and then download the Let’s Encrypt certificate to the Server for you. Everything is simple. 
Ensure that  Tomcat Server is shutdown. OK. Open the  Terminal window and execute the following commands:
sudo apt-get install software-properties-common

sudo add-apt-repository ppa:certbot/certbot

sudo apt-get update

sudo apt-get install certbot
After installing Certbot successfully, you can use this tool to create an SSL certificate for your domain: 
# Example:
sudo certbot certonly --standalone -d

# Example:
sudo certbot certonly --standalone -d
Certbot asks you to enter  email, which is necessary so that  Let's Encrypt organization notifies you of the time of updating the certificate or notices related to confidentiality.
Agree about the terms of  Let's Encrypt:
OK, Now, a directory containing SSL certificate information has been created on your server. 
  • /etc/letsencryt
  • /etc/letsencryt/live/{}

3- Install SSL Let's Encrypt for Tomcat

Use commands to grant permissions to files:
cd /etc/letsencrypt/live/

chown root:root *.pem
Next, use the command to copy the  cert.pem, chain.pem, privkey.pem files  created by you in the previous step to the {Tomcat}/conf directory  
cd /etc/letsencrypt/live/

cp cert.pem /root/Apps/tomcat9/conf

cp chain.pem /root/Apps/tomcat9/conf

cp privkey.pem /root/Apps/tomcat9/conf
Open the  server.xml file and add a code snippet.

<Connector port="8443" protocol="org.apache.coyote.http11.Http11NioProtocol"
     maxThreads="150" SSLEnabled="true">

        <Certificate certificateFile="conf/cert.pem"
                            certificateChainFile="conf/chain.pem" />

Restart Tomcat Server, and access your application with https:

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