@Sebastian-Roth Thanks for your reply.
It was not for use on internet.
I use let’s encrypt only for facility on a proof of concept.
But if we decide to use FOG, we have to implement some ssl to in production with real certificate authority.

Hello Dear All,

Can someone explain how to install certificat with letsencrypt?

I have use standard let’s encrypt installation for apache under ubuntu server.
So, I have :

ls -al /etc/letsencrypt/live/xxx.xxx.xxx.fr/

lrwxrwxrwx 1 root root 45 janv. 16 17:17 cert.pem -> …/…/archive/xxx.xxx.xxx.fr/cert1.pem
lrwxrwxrwx 1 root root 46 janv. 16 17:17 chain.pem -> …/…/archive/xxx.xxx.xxx.fr/chain1.pem
lrwxrwxrwx 1 root root 50 janv. 16 17:17 fullchain.pem -> …/…/archive/xxx.xxx.xxx.fr/fullchain1.pem
lrwxrwxrwx 1 root root 48 janv. 16 17:17 privkey.pem -> …/…/archive/xxx.xxx.xxx.fr/privkey1.pem

On the fog side:
/var/www/html/fog/management/other/ssl/srvpublic.crt
/var/www/html/fog/management/other/ca.cert.pem

/etc/apache2/sites-enabled/001-fog.conf:

<VirtualHost :80>
<FilesMatch “.php$”>
SetHandler “proxy:fcgi://127.0.0.1:9000/”
</FilesMatch>
ServerName 130.79.125.236
ServerAlias xxx.xxx.xxx.fr
DocumentRoot /var/www/
RewriteEngine On
RewriteCond %{REQUEST_METHOD} ^(TRACE|TRACK)
RewriteRule . - [F]
RewriteRule /management/other/ca.cert.der$ - [L]
RewriteCond %{HTTPS} off
RewriteRule (.) https://%{HTTP_HOST}/$1 [R,L]
</VirtualHost>
<VirtualHost :443>
KeepAlive Off
<FilesMatch “.php$”>
SetHandler “proxy:fcgi://127.0.0.1:9000/”
</FilesMatch>
ServerName yyy.yyy.yyy.yyy
ServerAlias xxx.xxx.xxx.fr
DocumentRoot /var/www/
SSLEngine On
SSLProtocol all -SSLv3 -SSLv2
SSLCipherSuite ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS>
SSLHonorCipherOrder On
SSLCACertificateFile /var/www/fog//management/other/ca.cert.pem
<Directory /var/www/fog/>
DirectoryIndex index.php index.html index.htm
</Directory>
RewriteEngine On
RewriteCond %{REQUEST_METHOD} ^(TRACE|TRACK)
RewriteRule . - [F]
RewriteCond %{DOCUMENT_ROOT}/%{REQUEST_FILENAME} !-f
RewriteCond %{DOCUMENT_ROOT}/%{REQUEST_FILENAME} !-d
RewriteRule ^/fog/(.)$ /fog/api/index.php [QSA,L]
SSLCertificateFile /etc/letsencrypt/live/xxx.xxx.xxx.fr/fullchain.pem
SSLCertificateKeyFile /etc/letsencrypt/live/xxx.xxx.xxx.fr/privkey.pem
Include /etc/letsencrypt/options-ssl-apache.conf
</VirtualHost>

What must be copy/move/updated between they files?

Many thanks in advance.