Generales

systemctl restart apache2
systemctl status apache2
a2enmod ssl

Generar Certificados Varios Pasos

 openssl genrsa -des3 -out server.key 4096
 openssl req -new -key server.key -out server.csr
 cp server.key server.key.org
 openssl rsa -in server.key.org -out server.key
 openssl x509 -req -days 365 -in server.csr -signkey server.key -out server.crt
 sudo mkdir /etc/apache2/ssl
 sudo cp server.crt /etc/apache2/ssl/server.crt
 sudo cp server.key /etc/apache2/ssl/server.key

Generar Certificados Un Paso

 openssl req -x509 -nodes -days 365 -newkey rsa:4096 -keyout apache-selfsigned.key -out apache-selfsigned.crt

Generar CSR para Comprar un Certificado

 openssl req -newkey rsa:4096 -nodes -keyout example.com.key -out example.com.csr

Generar CSR para Comprar un Certificado usando llave existente

 openssl req -key example.com.key -new -out example.com.csr

/etc/apache2/sites-available/000-default.conf
/etc/apache2/sites-available/default-ssl.conf
/etc/ssl/private/
/etc/ssl/certs/

<IfModule mod_ssl.c>
                SSLEngine on
 
                SSLCertificateFile      /etc/ssl/certs/apache-selfsigned.crt
                SSLCertificateKeyFile /etc/ssl/private/apache-selfsigned.key
</IfModule>

• https://www.techrepublic.com/article/how-to-create-a-self-signed-certificate-to-be-used-for-apache2/
• https://www.digitalocean.com/community/tutorials/how-to-create-a-self-signed-ssl-certificate-for-apache-in-ubuntu-18-04
• https://wiki.debian.org/Self-Signed_Certificate
• https://www.tecmint.com/install-nginx-with-virtual-hosts-and-ssl-certificate/