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What this article shares with you is how to set the ttl value of domain name resolution. The editor thinks it is very practical, so I share it with you. I hope you can get something after reading this article. Let's take a look at it.

It is appropriate to set a moderate TTL value for domain name resolution. If the TTL value is large, the longer it takes for the modified resolution to take effect, and when the TTL value is smaller, the stability and speed of domain name resolution will be affected.

What is the meaning of domain name resolution TTL?

TTL (Time- To-Live), which simply represents the time that a domain name resolution record is cached on the DNS server.

When the local DNS server receives the resolution request, it will send the resolution request to the DNS server specified by the domain name to obtain the resolution record. After obtaining this record, the record will be saved in the DNS server for a period of time. If the resolution request for this domain name is received again during this period, the DNS server will no longer issue a request to the DNS server, but will directly return the record just obtained. The time this record is kept on the DNS server is the TTL value.

How to set TTL for domain name resolution?

In domain name resolution, it is set in seconds, and the default setting is 900, that is, 15 minutes cache time. You can set a minimum of 200 seconds, that is, 3 minutes 20 seconds cache time.

In general, domain name resolution records are rarely changed. We can increase the TTL value of the domain name record to make the record cache longer in the local DNS server, so that when we visit the website over a longer period of time, the DNS server of the local ISP does not need to issue a resolution request to the domain name DNS server, but directly returns the domain name resolution record from the local cache.

The DNS record will be modified when the domain name space is changed. Due to the problem of DNS record cache, the new domain name record may take effect in some places, but in some places it may take a day or two or more to take effect, resulting in some users being unable to access the website for a period of time.

At this time, we can reduce the TTL value, modify it to the minimum value, wait for the cache to take effect, and then set the modified DNS to resolve to the new record, so that the local DNS can be updated to the new record as soon as possible, and then we change the TTL value to the default value.

The above is how to set the ttl value of domain name resolution. The editor believes that there are some knowledge points that we may see or use in our daily work. I hope you can learn more from this article. For more details, please follow the industry information channel.

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