Physical server refers to the server that is directly deployed on the physical hardware, which usually does not depend on virtualization technology. Compared with virtual servers or cloud servers, physical servers are more independent, and users can completely control the hardware and operating systems. Of course, the physical server can also use the CDN (Content Delivery Network) service, but it requires some additional configuration.

　　Here are some precautions and steps about using CDN on the physical server:

　　CDN configuration: select and register a CDN service provider, configure the CDN service according to the documents and guidelines provided by it.

　　Domain name configuration: Make sure your website or the domain name you use has been configured in the control panel of the CDN service provider. Generally, you need to modify the DNS record of the domain name and point it to the domain name or IP address assigned by the CDN provider.

　　CDN cache configuration: In the control panel of the CDN service provider, the configuration cache strategy is configured to ensure that the content is effectively caught on the CDN node. This helps improve access speed and reduce the load of the source server.

　　SSL certificate configuration: If your website uses HTTPS to ensure that the correct SSL certificate is configured on the CDN to safely transmit encrypted content.

　　Testing and monitoring: Before deploying CDN on the physical server, some tests are performed to ensure correct configuration. Monitor the performance and effect of CDN to adjust and optimize in time.

　　It should be noted that CDN is mainly used to accelerate the distribution of static content, such as pictures, styles, scripts, etc. For dynamic content on physical servers, such as database query or dynamic page generation, the influence of CDN is relatively small. In this case, it is key to ensure that the performance of the server itself is connected with the network.

　　Physical server can be used with CDN to increase content transmission speed, reduce delay, and improve user experience.