Domain name resolution can be seen as system navigation, the user input character address into the machine can recognize the IP address, this process determines the service accessibility, performance and stability. The Hong Kong cloud server can make resource configuration more flexible, but domain name resolution is also more complex. From basic A records to global traffic scheduling, from DNS hijacking to Dr Switchover, any configuration errors may affect services.

The essence of domain name resolution of Hong Kong cloud server is to use DNS (domain name System) level query to achieve address mapping, and the cloud server is special in its dynamic IP, elastic scalability, multi-defense deployment and other characteristics. In the most common A record, the traditional physical server generally only needs to bind A fixed IP, and the direct configuration of A record can point to the IP, but the Hong Kong cloud server requires instance restart, migration or load balancing switch to cause IP changes, if the analysis record is not updated in time, the user will have no way to access the service. When A cloud server instance generates a new IP address due to capacity expansion, the DNS interface is invoked through the SDK to modify A record in real time to avoid manual operation delays and errors. This dynamic binding mechanism is especially suitable for automated operation and maintenance scenarios, such as elastic scaling of Pods in Kubernetes clusters.

The choice of parsing record type directly affects the business form. Many users are only familiar with A record and CNAME record, but ignore the key role of MX, TXT, SRV and other records. Before configuration analysis, clear service requirements. If Web services need to be provided externally, A record or CNAME is the basis. In scenarios involving emails, certificates, and service discovery, you need to add corresponding record types and strictly follow the format specifications (for example, MX records must contain priority values).

Parsing performance optimization is the core of improving user experience. Every 100 ms increase in DNS query latency may cause the page opening speed to decrease by more than 5%, which is particularly sensitive to high-concurrency scenarios such as e-commerce and finance. The optimization direction can be expanded from three levels: multi-level cache, TTL strategy and intelligent line. First of all, DNS query results will be stored in the local DNS server, carrier cache and other levels, too long TTL (live time) value will delay the effective speed of record update, too short TTL will increase the query pressure. You are advised to set the TTL based on service stability requirements. For a test environment where IP addresses change frequently, set the TTL to 60 seconds. In the production environment, you are advised to set the core domain name to 300-600 seconds to balance the validity speed and query efficiency. Second, intelligent line resolution (such as DNSPod's line grouping, CloudFlare's CDN routing) returns the optimal IP based on the user's geographic location and carrier network.

The parsing collaboration between CDN and cloud server is another technical difficulty. CDN speeds up access by caching content on edge nodes, but its effectiveness depends on DNS resolution to direct users to the nearest node. A common mistake is to directly replace the primary domain name resolution with the CNAME record assigned by the CDN provider, resulting in unaccelerated API interfaces or dynamic requests that still point to the source station, forming a performance bottleneck. The correct approach is to point the primary domain name (such as example.com) A record to the CNAME address provided by the CDN service provider (such as example.cdn.com), and split the service type through the subdomain: Static resources use CDN acceleration (static.example.com), and dynamic apis retain the directly connected cloud server (api.example.com). In addition, the source back policy must be configured on the CDN console to ensure that edge nodes can correctly access the source IP address or domain name of the cloud server.

To sum up, the domain name resolution configuration of the Hong Kong cloud server integrates a comprehensive project of performance optimization, security defense, disaster recovery switching, and automated operation and maintenance. From the precise definition of basic record types to the intelligent scheduling of global traffic, from the encryption protection of DNSSEC to the redundant design of multi-cloud analysis, each link requires a deep combination of technology and business.