Building a CDN video cache server can help improve the loading speed and playback performance of video content, and provide a better user experience. Here are some basic steps and guidelines to set up a CDN video caching server:

　　​Choose a CDN service provider:

　　First, choose a reliable CDN service provider and choose a suitable solution based on your needs and budget.

　　Register and configure CDN service:

　　Register a CDN service account and configure it according to the provider's instructions. You need to provide domain name information and perform corresponding domain name resolution and configuration.

　　Set video caching rules:

　　​Set video caching rules and strategies based on your needs and business characteristics. You can define parameters such as cache time, cache area, cache strategy, etc. to better control the caching and distribution of video content.

　　Configure the video source station:

　　​Connect your video source site to the CDN service. You need to upload the video content to the origin server and configure the connection between the CDN service and the origin server.

　　Testing and monitoring:

　　After the configuration is complete, test to ensure that the video cache server is working properly. Check metrics such as video loading speed and cache hit rate, and make adjustments and optimizations as needed.

　　Safety and protection:

　　Consider adding security policies and protection mechanisms to prevent malicious attacks and hotlinking. You can set security policies such as access control and anti-hotlinking to protect your video content and server.

　　Monitoring and optimization:

　　Regularly monitor the performance and effectiveness of the CDN cache server. Optimize based on monitoring results and adjust caching strategies and parameters to provide a better video playback experience.

　　It should be noted that building a CDN video caching server requires certain technical knowledge and experience. If you are not familiar with this knowledge, it is recommended to consult a professional CDN service provider or technical team for more detailed guidance and support.