In this tutorial, we will cover all the openvpn configurations.
From the openvpn client to the openvpn server. Clients include pc, phone, router. servers include google cloud, aws, and others. Then we will also learn VPN connection test technique. For a visual overview, here is the my YouTube video.

The whole tutorial is divided into 4 parts.
Part 1, The VPC, is where our remote vpn server reside in.
VPC example, let’s take google.
Pricing for google cloud.
Static IP cost

Type	Price/Hour
Static IP address (assigned but unused)	$0.010
Static IP address (assigned and in use)	No charge
Ephemeral IP address (attached to instance or forwarding rule)	No charge

Egress cost

Here is my actual GCP bill.

Product	Resource	Usage	Amount
Compute Engine	Static Ip Charge in Japan	296.62 Hour	$4.43
Compute Engine	Network Internet Egress from Virginia to China	16.03 Gibibyte	$3.69
Compute Engine	Network Internet Egress from Los Angeles to China	14.54 Gibibyte	$3.34
Compute Engine	Network Internet Egress from Americas to China	8,878.51 Mebibyte	$1.99
Compute Engine	Micro instance with burstable CPU running in Japan	9,460.08 Minute	$1.45
Compute Engine	Micro instance with burstable CPU running in Virginia	7,801.22 Minute	$1.12
Compute Engine	Micro Instance with burstable CPU running in Los Angeles	6,201.73 Minute	$0.94
Compute Engine	Network Internet Egress from Japan to China	2,591.20 Mebibyte	$0.58
Compute Engine	Network Internet Egress from Japan to Americas	2,009.34 Mebibyte	$0.27
Compute Engine	Network Internet Egress from Singapore to China	996.54 Mebibyte	$0.22
Compute Engine	Storage PD Capacity in Japan	2,884.21 Gibibyte-hour	$0.20
Compute Engine	Micro instance with burstable CPU running in Singapore	758.25 Minute	$0.12
Compute Engine	Storage PD Capacity in Los Angeles	1,415.42 Gibibyte-hour	$0.09
Compute Engine	Storage PD Capacity in Virginia	1,300.55 Gibibyte-hour	$0.08
Compute Engine	Network Internet Egress from Virginia to Americas	103.90 Mebibyte	$0.01

Machine type cost: Disk cost: 
Cost is base on CPU cores, memory and GPUs you selected. I am currently using 2 VPN clients, which doesn’t consume too much resources. 1 vCPU and 0.6G RAM is ok.

Generally, the distance between your real address and your remote server will make a big effect on your network speed. Actually I found it’s a big deal. The connection between China and east America is fast enough for me to watch 4K video.

Part 2: The OPEN VPN server
openvpn is open source VPN with GPL licence. But OPENVPN-AS application from openvpn.net is not a free one. Anyway, you can build your own openvpn from scratch, see this video. Or, you can use script written by others to make things more easier, see this video.

Part 3: The OPEN VPN client.
we can find the private vpn client (not a free vpn service by openvpn offical) on the openvpn.net main page, including window, mac, android, and iphone. Can this client use my own .ovpn file. Yes, it can! but you need to sign up private vpn account, which make it annoying. Anyway, we can find the OPEN VPN client for windows in the openvpn.net. and we can download openvpn client from google easily.

Part 4: VPN connection test.
Have you ever seen your IP address is changed, but you still can access the blocked internet? That’s why you should know how to test your VPN connection. I always set my router’s, phone, pc’s dns address to OPEN DNS, or other DNS. so I am sure my DNS traffic won’t go to my ISP. DNS leak test will always help you out.