How to configure DNS cache in Linux?

How do I check my DNS settings in Linux?

Use the command "dig" and look for the dns records.

Com This will print all the DNS records for the domain. You can get the MX, A, and AAAA records with "MX" as the first letter of the output.

For ubuntu/debian. Nm-tool com. Type: DNS. Server Address: 172.16.10.3
DNSSEC: no. Zone file: /etc/bind/zones/example.zone Default TTL: 3600 (1 hour). Min TTL: 900 (15 mins). Max TTL: 604800 (7 days). DNSSEC OK: yes. DNSSEC Root Key: KEYA. DNSSEC Sub-Keys: KEYCKEYZ. Try dig or nslookup. Dig google.

How to configure DNS cache in Linux?

Most of the Linux distros provide a mechanism to cache DNS responses locally (DNS cache). The caching can be done by adding dnsmasq in their distributions, but we'll discuss how to do this in more detail. We will then see how we can configure Open DNS, a popular free and open-source public DNS service, so it gets cached as well.

The benefit of caching is that it prevents frequent queries to servers for dynamic domains such as email addresses, URLs or even names within internal systems. Instead of going to a webserver each time someone types a domain name into their browser, you could get a cached version from the local host and just browse normally.

Dnsmasq is probably the most popular open-source DNS daemon available for your operating system, and comes installed with some of the most common Linux distributions. It caches domain names in-memory, and when it's asked to serve another domain, it checks first whether its cache has an entry for the requested domain. If it finds one, it serves the corresponding record from its internal memcached instance, which is backed by an in-memory instance.

It's a great tool to improve internet traffic and speed up network traffic, especially if you're using a high-speed network connection, with over gigabit speeds available nowadays. To start the dnsmasq daemon, log into your system with your favorite shell and run the command: sudo service dnsmasq start. That's it! Now we're all set to have our own cache on this Ubuntu system. To see whether dnsmasq is indeed running, we'll ask what's running on the system: ps -ef Notice that I started dnsmasq with the -X option, which enables access to the running process. If you want to kill the process completely, just type the following. It will also automatically restart the process:

Sudo service dnsmasq -X stop. You'll notice a couple of files and directories being created by the dnsmasq daemon. They're usually all grouped into dnsmasq : The dnsmasq configuration directory is located at /etc/dnsmasq.