ssl

openssl \
req \
-nodes \
-newkey rsa:2048 \
-keyout www.example.com.key \
-out www.example.com.csr \
-subj "/C=DE/ST=NRW/L=Berlin/O=My Inc/OU=DevOps/CN=www.example.com/emailAddress=dev@www.example.com"

a2enmod ssl
a2ensite default-ssl
service apache2 restart

cp /tmp/2_*.crt /etc/ssl/certs/
cp /tmp/1_root_bundle.crt /etc/ssl/certs/
cp /tmp/*.key /etc/ssl/private/

/etc/apache2/sites-enabled/default-ssl.conf
SSLEngine on
SSLProtocol all -SSLv2 -SSLv3
SSLCipherSuite ALL:!DH:!EXPORT:!RC4:+HIGH:+MEDIUM:!LOW:!aNULL:!eNULL

# check certificate
https://www.ssllabs.com/ssltest/analyze.html
http://www.panticz.de/Check-SSL-TLS-server-encryption-support

# determine SSL certificate expiration date
openssl x509 -enddate -noout -in www.example.com.pem

# list certificate domains
cat cert.pem | openssl x509 -text | grep DNS
openssl s_client -showcerts -connect www.example.com:443 | openssl x509 -text | grep DNS

# Letsencrypt
http://www.panticz.de/letsencrypt

# remove password from private key
openssl rsa -in www.example.key.pass -out www.example.key

# cat / deploy certificate to remote host

Installation
https://certbot.eff.org/

#sudo apt-get install -y software-properties-common
#sudo add-apt-repository -y ppa:certbot/certbot
sudo apt-get update
sudo apt-get install -y certbot

# Install certbot package with Ansible:
https://github.com/panticz/ansible/tree/master/roles/certbot

# create certificate and configure nginx
certbot --nginx -d www.example.com

create wildcard certificate