Yes,you can do.
if you have one ubuntu droplet.
so,you can starting from wordpress.
install wordpress need:
apache/nginx+mysql+php-fpm php-xml php-mbstring php-imap php-mail php-memcache
1.install command(if you want install apache,so you can apache replace nginx):
apt-get install -y nginx mysql-server mysql-client php-fpm php-xml php-mbstring php-imap php-mail php-memcache
2.after,mysql need you setting one password.
3.go install finish
4.please you in browser visit you droplet ip,watch nginx or apache is really working.
5.open page path. (cd /var/www/html) in here use wget download wordpress (download address you can on wordpress website get)
6.unzip
7.use command: mv wordpress/* .. (unzip after all files move to html directory)
8.back up directory(/var/www),execute chmod -R 755 * and chown -R www-data:www-data(if apache also apache:apache) *
9.ok,next open /etc/nginx/sites-enbled/default,find servername choose,input you domain. E.g.
servername xxx.xxx
10.great,let’s we are login mysql,create one mysql database.
mysql -u root -p
password:
mysql > CREATE DATABASE wordpress;
mysql > exit
11.all is ok,you can open you domain start install wordpress process.
so,install openvpn and wordpress can use not same port.
Tips:this is install openvpn scrpit.
https://github.com/Nyr/openvpn-install