Updating the SSL certificate for a Web server running in a Docker container¶

To update the SSL certificate, you need to:

Enter the nginx-certbot container:
```
docker exec -it nginx-certbot /bin/bash
```
Result: You gain access to the command line inside the container.
Create a directory for ACME validation:
```
mkdir -p /var/www/html/.well-known/acme-challenge
```
Result: The necessary directory structure for domain verification is created.

Set the correct permissions:

chown -R www-data:www-data /var/www/html/.well-known

chmod -R 755 /var/www/html/.well-known

Result: The correct permissions are set for the web server.

Renew the certificate:
```
certbot renew --webroot -w /var/www/html
```
Result: The certificate renewal process is initiated. A success message will be displayed upon completion.
Exit the container:
```
exit
```
Result: You exit the container's command line and return to the main system.
Restart the container:
```
docker restart nginx-certbot
```
Result: The container is restarted, applying the new certificate to the web server.