The Domain Name System (DNS) translates user-friendly domain names into the numerical IP addresses that computers understand. This translation process is expedited by the DNS cache, a local repository storing recent domain name lookups. While this cache enhances online efficiency, there are instances when its clearance becomes necessary. So, today, we will explain what it is and how to flush it in Linux systems and guide you through the process.
What is DNS Cache?
The Domain Name System (DNS) is a fundamental component of the internet, responsible for translating human-readable domain names into IP addresses that computers use to locate and communicate with each other. To expedite this process and reduce the time it takes to access websites or other online resources, operating systems and web browsers often maintain a local DNS cache.
In simple terms, a DNS cache stores recent DNS lookups, including the corresponding IP addresses. This means that when you visit a website, your computer doesn’t need to perform a full DNS lookup every time, which can improve page loading times. Instead, it can quickly retrieve the IP address from the cache. However, there are times when you might want to clear or flush it.
Being an online business owner or a network administrator, checking DNS records will become a constant task for you. So better to know how to do it from now!
How to check DNS records on Windows, Linux and macOS?
To check DNS records on Windows, Linux, and macOS, you can use the nslookup command. This command allows you to query DNS servers for information about a specific domain or hostname. Linux and macOS have another choice to check DNS records which is the host command. Both “nslookup” and “host” work well, but the second provides more detailed statistics and more options for precise searches. We do recommend using the host command!
What does the Dig command do?
Domain Information Groper, or DIG for short, is a wonderful command-line utility. To provide comprehensive details on mail exchanges, host addresses, and other relevant information, we use Dig to query the DNS name server. This utility is compatible with a variety of operating systems, including Linux and macOS.
You can do DNS queries using the built-in Linux Dig command by using the Terminal application. Your domain can be troubleshot, and you can learn a lot of details about it, such as DNS records, Name servers, and general network information. Its excellent features include having more functionality than some built-in utilities, like nslookup, and being quite simple to use. Because of this, despite having a straightforward command-line interface, many network administrators use it often.
The most popular examples of the Dig command!
Linux commands – Explanation
Linux commands are Linux operating system utilities. An interface that receives lines of text and converts them into instructions for your computer is known as a command line.
In addition, we use the Linux terminal to run the commands. Similar to the command prompt in the Windows OS, the terminal is a command-line interface for interacting with the system. A graphical user interface (GUI) is simply a command-line application abstraction.
A brief history of Linux Basics
A sizable group of enthusiasts worked on the Linux Basics Operating System online. A Finnish university student named Linus Torvalds began work on the project in 1990, initially seeing the development of an Operating System as a homework assignment. Since then, it has significantly expanded and evolved into the most feature-rich Unix clone that can execute applications, much like the avalanche of Linux.
Linux is a potent, quick, and free piece of software that is becoming more and more well-liked online.