Clear DNS resolution cache under UbuntuLinux

Most DNS clients cache the results of domain name resolution locally, which can speed up access to the same address. When you open a single page, there are usually multiple access requests to the same domain name. Basically, each file, image, and style sheet ...... These are all DNS resolution requests for the same domain name within the same page. Therefore, if you have cached incorrect DNS entries locally, you need to clear your cache so that the DNS client initiates a new DNS request and updates the resolution result. You can also wait.

Most DNS clients cache the results of domain name resolution locally, which can speed up access to the same address. When you open a single page, there are usually multiple access requests to the same domain name. Basically, each file, image, and style sheet ...... These are all DNS resolution requests for the same domain name within the same page.

Therefore, if you have cached incorrect DNS entries locally, you need to clear your cache so that the DNS client initiates a new DNS request and updates the resolution result. Of course, you can also let the system automatically overwrite the cached DNS entry after it expires ...... This usually takes 24 hours. However, some releases will run a domain name resolution cache service in the background. Of course, some releases do not have this service. If your Ubuntu background has this program, you can clear the cache by restarting the nscd service.

In Ubuntu Linux, the DNS cache is washed out by restarting the nscd daemon.

To install nscd, run the following command in the command line:

Sudo aptitude install nscd

The command for clearing DNS cache in Ubuntu is:

Sudo/etc/init. d/nscd restar