https://www.digitalocean.com/community/tutorials/how-to-install-and-use-docker-on-ubuntu-16-04
How To Install and Use Docker on Ubuntu 16.04
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http://stackoverflow.com/questions/11879287/export-git-with-version-history
sudo dhclient -r; sudo dhclient
# failed attempt
grep sshd.\*Failed /var/log/auth.log | less
# successful attempts
grep sshd.\*Accepted /var/log/auth.log | less
http://www.apachetutor.org/admin/reverseproxies