https://support.rackspace.com/how-to/generate-a-csr-with-openssl/
#rpm -qa | grep -i openssl
#yum install openssl openssl-devel
#dpkg -l |grep openssl
#apt-get install openssl
#mkdir ~/domain.com.ssl/
#cd ~/domain.com.ssl/
#openssl genrsa -out ~/domain.com.ssl/domain.com.key 2048
#openssl req -new -sha256 -key ~/domain.com.ssl/domain.com.key -out ~/domain.com.ssl/domain.com.csr
#openssl req -noout -text -in ~/domain.com.ssl/domain.com.csr
