Find ssh public key.

// list all public keys.
ls ~/.ssh/*.pub

// copy public keyj
cat ~/.ssh/id_rsa.pub |pbcopy

Copy SSH key to server

Use command ssh-copy-id -i ~/.ssh/YOURKEY USERNAME@route.to.server to copy the ssh to server, ask for password :)

Then use ssh USERNAME@route.to.server to connect to server.

Set up firewall

Use UFW set up basic firewall. To list all applications that has register their profiles:sudo ufw app list

Allows SSH connections: sudo ufw allow OpenSSH

Allow Specific IP Addresses: sudo ufw allow from xx.xx.xx.xx

Enable firewall: sudo ufw enable

Check status: sudo ufw status

Set up OpenVPN on Ubuntu 16

Install OpenVPN.

sudo apt-get update
sudo apt-get install openvpn

Download .ovpn file curl -O https://config.ovpn

Config & connect openVPN using .ovpn file

copy .ovpn file to /etc/openvpn/ folder. copy password file to /etc/openvpn/ folder. edit .openvpn file, add auth-user-pass filename in your .ovpn where filename is the file with username/password on 2 lines.

Then rename the xxx.ovpn to xxx.conf file for the deamon setup

	sudo systemctl start openvpn@client
	sudo systemctl status  openvpn@client

Setup github

Install Git: sudo apt-get install git

Checking for existing SSH keys: ls -al ~/.ssh

If no SSH public key, generate new SSH key: ssh-keygen -t rsa -b 4096

Add SSH key to the ssh-agent:

eval "$(ssh-agent -s)"  // run ssh-agent in background
ssh-add ~/.ssh/id_rsa   // add SSH Key

Add new SSH Key to Github account. https://help.github.com/articles/adding-a-new-ssh-key-to-your-github-account/#platform-linux

Install node.js

DO NOT USE sudo apt-get install nodejs

curl -sL https://deb.nodesource.com/setup_6.x | sudo -E bash -
sudo apt-get install -y nodejs

Allowed node.js access port 80

// Find node location
which node  // NODE_LOCATION/node
// Bind ports
setcap 'cap_net_bind_service=+ep' NODE_LOCATION/node

Set up nodejs as ubuntu service, run nodejs as boot.

install forver: npm install forever -g

Create and save the systemd service file in /etc/systemd/system as myforever.service.

https://www.axllent.org/docs/view/nodejs-service-with-systemd/

[Unit]
Description=Node.js Example Server
#Requires=After=mysql.service       # Requires the mysql service to run first

[Service]
ExecStart=/usr/local/bin/node /opt/nodeserver/server.js
# Required on some systems
#WorkingDirectory=/opt/nodeserver
Restart=always
 # Restart service after 10 seconds if node service crashes
 RestartSec=10
 # Output to syslog
StandardOutput=syslog
StandardError=syslog
SyslogIdentifier=nodejs-example
#User=<alternate user>
#Group=<alternate group>
Environment=NODE_ENV=production PORT=1337

[Install]
WantedBy=multi-user.target

systemctl start myforever.service
systemctl enable myforever.service

References

Add user, set new user root privileges https://www.digitalocean.com/community/tutorials/initial-server-setup-with-ubuntu-16-04

UFW document https://www.digitalocean.com/community/tutorials/how-to-set-up-a-firewall-with-ufw-on-ubuntu-14-04

UFW common firewall rules and commands https://www.digitalocean.com/community/tutorials/ufw-essentials-common-firewall-rules-and-commands

Setup Github ssh connection https://help.github.com/articles/checking-for-existing-ssh-keys/#platform-linux

Ubuntu install nodejs https://github.com/nodesource/distributions

Get node instance ps -aux | grep node

Running Node.js App With Systemd https://nodesource.com/blog/running-your-node-js-app-with-systemd-part-1/

Set openvpn client conf file https://help.ubuntu.com/lts/serverguide/openvpn.html