Web servers often face high operational costs and reliance on expensive third-party services, which are inefficient in terms of cost and security. This study addresses these issues by developing a CasaOS- based web server using Docker and Cloudflare Tunnels technology on Linux Ubuntu. The Research and Development (R&D) method was used, involving design, implementation, and testing stages. The implementation process included installing Linux Ubuntu, configuring static IPs, installing CasaOS, managing applications with Docker, and secure access through Cloudflare Tunnels. Testing was conducted on native websites and WordPress to evaluate ease of use and system performance. The results show that this web server provides high efficiency, better security, and ease of management without additional costs, effectively addressing high operational costs and reliance on third-party services.