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OpenVPN is the most known open source SSL VPN (Virtual Private Network) in the world. OpenVPN implemented OSI Layer 2 or 3 by securing network extension using SSL/TLS protocol. They allow you to connect securely to an insecure public network such as wifi in the cafe or public area. For Corporate and Enterprise they commonly used to allowing/blocking connection for back-office application or even secure connection to the server itself. When you has been read my post before , you can escalate this method to more secure than before, since before we have the SSH Port still exposing to public (although only public key authentication are allowed). This post scoped only in  CentOS  7 and I'm using  Alibaba Cloud  as my cloud provider. Using other Operating System (OS) or cloud provider may need some adjustment to be matched, but I'll describe in general. If you have a trouble during follow this tutorial, don't hesitate to ask in the comment. Go go go! Step 1 Find IP of Serv

As I came from Software Engineering background since my first employment, it's my big step to jump in DevOps area. Because at my recent employment, I trusted by the CIO to manage this area. I think all of the knowledge and practice them out, need to be well documented and I remember that I have a blog here. So this is my first time to documented all of the knowledge that I've practice before, in all of the environment ( development , staging , sandbox or even production ) in my recent employment. CentOS Logo I'm starting with the fundamental one, initial server setup with CentOS . This post scoped only in  CentOS  7 and I'm using  Alibaba Cloud  as my cloud provider. Using other Operating System (OS) or cloud provider may need some adjustment to be matched, but I'll describe in general. If you have a trouble during follow this tutorial, don't hesitate to ask in the comment. Go! Step 1 Add Non-Root User Once you have created instance, you need to