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Asked: 2024-09-23T17:48:19+05:30 In:

What are the steps to flush the DNS cache on an Ubuntu system?

So, I’ve been tinkering around with my Ubuntu system lately, trying to get things running a bit smoother. I keep hearing that flushing the DNS cache can help fix some connectivity issues and just keep everything fresh. However, I’m not entirely sure how to do it and, honestly, I’m a bit intimidated by the terminal.

I mean, I know some basic commands, but I don’t want to mess anything up. It would be fantastic if someone could break down the steps for me in a way that’s not too techy or overwhelming.

Do I need to become some kind of command-line wizard for this, or is it pretty straightforward? I’ve read a few forums where people talk about using specific commands, but they just flew over my head. I don’t want to accidentally delete something crucial while I’m in there!

From what I’ve gathered, it seems like there are a couple of approaches to flushing the DNS cache, depending on which version of Ubuntu you’re using. Is that true? And what about the different DNS caching services? Like, am I supposed to use `systemd-resolve` or go for something like `dnsmasq`?

And here’s another thing: I want to know if I need to restart my network service or reboot the whole system after doing this. Or is it done, and I can just carry on with my browsing?

Would someone be kind enough to walk me through it? Maybe if you’ve done it before, you could share your experience? I’d totally appreciate any tips or step-by-step instructions! Just keep it simple, please — I’m not looking for a whole thesis on the topic, just a nice, digestible format that’ll help me get through this without breaking anything. Thanks a lot!

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    2 Answers






    1. Flushing DNS Cache on Ubuntu


      How to Flush DNS Cache on Ubuntu

      Flushing the DNS cache is a great way to fix connectivity issues and keep things running smoothly. Don’t worry, it’s not too complicated, and you won’t need to be a command-line wizard to do it!

      Step-by-Step Guide

      1. Open your terminal. You can do this by pressing Ctrl + Alt + T.

      2. Now, depending on your Ubuntu version and the DNS service you’re using, you can use one of the following commands:

        • If you’re using systemd-resolved (common in Ubuntu 18.04 and later), type:
          • sudo systemd-resolve --flush-caches
        • If you’re using dnsmasq (more common in older systems), type:
          • sudo /etc/init.d/dnsmasq restart

      3. After entering the command, press Enter.

      4. You might be prompted to enter your password. Just type it in (you won’t see anything being typed, which is normal) and then hit Enter again.

      5. That’s it! You don’t need to restart your network service or reboot the whole system. Just continue browsing!

      Summary

      Flushing the DNS cache is quick and easy! Just remember to use the command that matches your DNS service and version of Ubuntu. Don’t stress about messing things up. As long as you stick to these commands, you should be fine!

      Feel free to reach out if you have any other questions or need further clarification. You’ve got this!



    2. Flushing the DNS cache on your Ubuntu system is a straightforward process, and you don’t need to be a command-line wizard to do it. Depending on the version of Ubuntu you’re using, you may need to use different commands. For Ubuntu versions that utilize `systemd`, you can simply open the terminal and type sudo systemd-resolve --flush-caches. This command will clear the DNS cache, helping to refresh your browsing experience without any need for concern. If you are using an older version or have a different setup that employs dnsmasq, you might want to restart the service instead by running sudo systemctl restart dnsmasq. No advanced knowledge is required – just make sure to enter the command correctly, and no essential data will get deleted.

      After flushing the DNS cache, there’s no need to restart your whole system or network service. Just continue with your browsing, as the flushing process takes effect immediately. It’s a good practice to take your time when executing commands; read them carefully before pressing enter to avoid any mistakes. If you’re particularly cautious, you can do a quick backup of important files or create a system restore point. Overall, it’s a simple task that helps with connectivity issues, and with practice, you’ll find the terminal isn’t as intimidating as it seems!


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