# OpenVPN Installation Instructions
###### tags: `OpenVPN` `vpn`
[Download](https://openvpn.net/index.php/open-source/downloads.html) from OpenVPN official website

To Build and Install,

tar -zxf openvpn-<version>.tar.gz
cd openvpn-<version>
./configure
make
## Errors that may encounter in building
* configure: error: openssl check failed
######
$ sudo apt install libssl-dev
* if installing libssl error, install `zlib1g` first and install `libssl`
>>Depends: zlib1g (= 1:1.2.8.dfsg-2ubuntu4) but 1:1.2.8.dfsg-2ubuntu4.1 is to be installed

$ sudo apt install zlib1g=1:1.2.8.dfsg-2ubuntu4
>> **Warning** `sudo apt install zlib1g` is bugged!
* configure: error: lzo enabled but missing
######
$ sudo apt-get install liblzo2-dev
* configure: error: libpam required but missing
######
$ sudo apt-get install libpam0g-dev

## For VPN client
$ sudo apt-get install openvpn
$ sudo openvpn xxxx.ovpn

> remember `sudo` in `sudo openvpn`
>
### reference
> https://zhuanlan.zhihu.com/p/26897605