sudo openssl genrsa -out /opt/bitnami/apache2/conf/server.key 2048
sudo openssl req -new -key /opt/bitnami/apache2/conf/server.key -out /opt/bitnami/apache2/conf/cert.csr
sudo openssl x509 -in /opt/bitnami/apache2/conf/cert.csr -out /opt/bitnami/apache2/conf/server.crt -req -signkey /opt/bitnami/apache2/conf/server.key -days 365
sudo /opt/bitnami/ctlscript.sh restart apache
sudo /opt/bitnami/bncert-tool
at last
sudo rm -rf /opt/bitnami/apache2/conf/server.crt
sudo rm -rf /opt/bitnami/apache2/conf/server.key