How to set up DNS resolution? DNS resolution operation steps and precautions

in the connection between the domain name and the server, DNS resolution is an indispensable core step, which determines whether the user can smoothly jump to the corresponding website after entering the domain name. Many beginners often take detours because they are not familiar with DNS resolution when they first come into contact with domain name configuration, which not only delays the online time of the website, but also may cause abnormal access problems. This article will disassemble all aspects from basic cognition, operation steps, optimization skills and precautions to help readers quickly master the complete operation logic of DNS resolution and easily complete the binding configuration of the domain name and the server.

First, the basic cognition of DNS resolution needs to be mastered?

want to successfully complete the DNS resolution settings, we must first clarify its core role and basic principles to avoid conceptual errors in subsequent operations.

1, the core role of DNS resolution

DNS resolution is the process of converting an easy-to-remember domain name into an Internet Protocol Address that can be recognized by a computer. After the user enters the domain name in the browser, the system will look up the corresponding Internet Protocol Address through the DNS server to establish a connection with the target server and realize website access. Without correct DNS resolution, even if the domain name and server are running normally, the user cannot access the website through the domain name.

2, common record types for DNS resolution

different business requirements correspond to different DNS resolution record types, of which A record is the most commonly used type, used to point the domain name to the IPv4 address; AAAA record is to point the domain name to the IPv6 address; CNAME record is mainly used to point the domain name to another domain name, suitable for CDN acceleration or multi-domain name pointing to the same server scenario; MX record is responsible for configuring the mailbox service, determine the path of mail reception.

2. DNS resolution operation steps of mainstream platforms?

the current domestic mainstream domain name service providers such as Alibaba Cloud, Tencent Cloud, etc. provide a visual DNS resolution configuration interface, the operation process is roughly similar, the following are the general detailed steps.

1, enter the DNS resolution management background

log in to the official website of the service provider where the domain name is located, enter the domain name management console, find the "DNS resolution" option of the corresponding domain name and click to enter. Some service providers may name it "domain name resolution", and the core function is the same. After entering the background, you can see the current list of resolution records.

2, add a new DNS resolution record

click the "Add Record" button and select the record type according to the business needs. For example, to build a website, select A record. Fill in the host record. If you want to point the main domain name to the server, fill in the host record with "@". If you want to set the subdomain name, fill in the corresponding prefix, such as "www". Then fill in the record value, that is, the Internet Protocol Address of the server. The TTL value can be kept by default. Finally, click Save to complete the addition.

3, verify whether DNS resolution is effective

add a record, it usually takes 10 minutes to 2 hours to take effect, which can be verified by the ping command or online DNS query tool. Enter "ping domain name" in the CMD window of the computer. If the returned Internet Protocol Address is consistent with the set record value, it means that the DNS resolution has taken effect; if it is inconsistent, you can wait for a period of time to verify again, or check whether the record is filled in incorrectly.

What are the optimization skills of DNS resolution?

complete the basic DNS resolution settings, some optimization techniques can improve the resolution efficiency and website access speed, and enhance the user experience.

1, set the TTL value reasonably

TTL value is the cache time of DNS resolution records. Reasonable setting can balance the resolution speed and update flexibility. If the Internet Protocol Address of the website server changes frequently, the TTL value can be set smaller, such as 600 seconds, so that the resolution record can be updated quickly. If the server IP is stable for a long time, the TTL value can be set to 3600 seconds or even longer to reduce the number of queries of the DNS server and improve the resolution efficiency.

2, configure multi-line DNS resolution

for websites with multiple servers or accelerated using CDN, multi-line DNS resolution can be configured. According to the user's operator line such as telecom, China Unicom, mobile, the domain name points to the corresponding server IP, so that users of different lines can access the nearest server, effectively reduce access latency and improve website loading speed.

4. Common precautions for DNS resolution?

in the DNS resolution setting and use process, there are many details that are easy to be ignored, and a little attention may cause abnormal access problems, which need to be paid attention to.

1 Confirm the DNS server configuration

some users after configuring DNS resolution on third-party platforms, they find that the records are never effective, often because the DNS server of the domain name has not been switched to the corresponding platform. Check the "DNS server" option in the domain name management background to confirm that its address is consistent with the official DNS server address of the resolution platform. If it is inconsistent, it needs to be modified in time. After modification, it usually takes about 24 hours for the global effective time.

2 Avoid duplicate or conflicting analytical records

when adding DNS resolution records, it is necessary to avoid multiple conflicting record types corresponding to the same host record. For example, setting A records and CNAME records at the same time for the same domain name will cause the DNS server to fail to determine which record to resolve first, which will cause an access exception. If you need to change the record type, you should delete the original record first, and then add a new record.

To sum up, DNS resolution is the core step of domain name configuration, from basic cognition to actual operation, to optimization and risk avoidance, each link has details that need to be paid attention to. By mastering the basic principles of DNS resolution, familiar with the operation steps of mainstream platforms, and using reasonable optimization skills, while avoiding common configuration misunderstandings, you can successfully complete the binding of domain names and servers, ensure the normal access of the website, and lay a solid foundation for subsequent website operations.