ClickHouse is an open-source column-oriented DBMS developed by Yandex. ClickHouse works 100-1000x faster than traditional approaches. It's good for Big Data, business analytics and time series data. ClickHouse is the first open source SQL data warehouse to match the performance, maturity, and scalability of proprietary databases like Sybase IQ, Vertica, and Snowflake.

In this short guide I will show you how to quickly install an OpenVPN server using an existing Docker image. It is possible to install an OpenVPN server, but with Docker everything is much easier. You don't need to buy a third party service, everything is completely free.

You must have your own VPS server. If not, you can buy a VPS on DigitalOcean. You can buy the least expensive from $2 to $5 per month.