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How to Flush the DNS Cache in Ubuntu & Why You Might Need To

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[系统(linux) 所属分类 系统(linux) | 发布者 店小二03 | 时间 2016 | 作者 红领巾 ] 0人收藏点击收藏

Domain Name Servers are one of the backbones of the internet. Without them, the entire system of domain names wouldn’t work and we’d have to navigate the web using straight IP addresses ― not my idea of fun, if you ask me.

Whenever you access a domain name, your system keeps a record of which IP address that domain points to (this is called a cache ). This makes your next access to that domain much faster because you don’t have to look it up, which could take seconds.

But sometimes your local domain name cache falls out of sync with the actual mapping of a domain name to IP address.That’s why sometimes you can’t access a website even though the website isn’t down ― especially if that website has moved servers recently.

When that happens, you need to flush your DNS cache. Fortunately, this can be done with a simple terminal command on Ubuntu and other Debian systems:

$ sudo /etc/init.d/dns-clean

There are other DNS-related tricks that might prove useful to you, such as optimizing DNS for faster internet speeds How to Optimize Your DNS for Faster Internet How to Optimize Your DNS for Faster Internet "The Internet is just a series of tubes" as one man so wisely stated. Unfortunately, it’s not as simple as that. There’s a complex architecture that supports the Internet, and data packets need to travel... Read More and changing your DNS for improved online security How To Change Your DNS Servers & Improve Internet Security How To Change Your DNS Servers & Improve Internet Security Imagine this - you wake up one beautiful morning, pour yourself a cup of coffee, and then sit down at your computer to get started with your work for the day. Before you actually get... Read More , so look into that when you can.

Did this work? If you’re using a DNS service, let us know which one you’re using in a comment down below!

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