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Destroyed OpenVPN server: Setup OpenVPN server (markdown)

DL6ER 2018-05-13 14:25:26 +02:00
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OpenVPN-server:-Setup-OpenVPN-server.md

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### Change OpenVPN's resolvers
First, find the IP of your `tun0` interface:
On jessie
```
ifconfig tun0 | grep 'inet addr'
```
On Stretch
```
ip a
```
Edit the OpenVPN config file:
```
vim /etc/openvpn/server.conf
```
Set this line to use your Pi-hole's IP address, which you determined from the `ifconfig` command and comment out or remove the other line (if it exists):
```
push "dhcp-option DNS 10.8.0.1"
#push "dhcp-option DNS 8.8.8.8"
```
This `push` directive is setting a [DHCP option](https://www.incognito.com/tips-and-tutorials/dhcp-options-in-plain-english/), which tells client's connecting to the VPN that they should use Pi-hole as their primary DNS server.
It's [suggested to have Pi-hole be the only resolver](https://discourse.pi-hole.net/t/why-should-pi-hole-be-my-only-dns-server/3376) as it defines the upstream servers. Setting a non-Pi-hole resolver here [may have adverse effects on ad blocking](https://discourse.pi-hole.net/t/why-should-pi-hole-be-my-only-dns-server/3376) but it _can_ provide failover connectivity in the case of Pi-hole not working if that is something you are concerned about.
### Restart OpenVPN to apply the changes
Depending on your operating system, one of these commands should work to restart the service.
```
systemctl restart openvpn
service openvpn restart
```
## Create a client config file (`.ovpn`)
Now that the server is configured, you'll want to connect some clients so you can make use of your Pi-hole wherever you are. Doing so requires the use of a certificate. You generate these and the resulting `.ovpn` file by running the installer and choosing `1) Add a new user` for each client that will connect to the VPN.
You can repeat this process for as many clients as you need. In this example, we'll "Add a new user" by naming the `.ovpn` file the same as the client's hostname but you may want to adopt your own naming strategy.
Run the OpenVPN installer again
```
./openvpn-install.sh
```
Choose `1) Add a new user` and enter a client name
```
Looks like OpenVPN is already installed
What do you want to do?
1) Add a new user
2) Revoke an existing user
3) Remove OpenVPN
4) Exit
Select an option [1-4]: 1
Tell me a name for the client certificate
Please, use one word only, no special characters
Client name: iphone7
```
This will generate a `.ovpn` file, which needs to be copied to your client machine (often times using the OpenVPN app). This process also generates a few other files found in `/etc/openvpn/easy-rsa/pki/`, which make public key authentication possible; you only need to worry about the `.ovpn` file, though.
***
### Next Steps
Next, [configure your client devices](https://github.com/pi-hole/pi-hole/wiki/OpenVPN-server:-Connect-from-a-client) to use the VPN.