Linux named / bind how to dump, view and clear the cache!

Do you hate it when your ISP has old cached records because of a high TTL on the DNS record of the relevant domain?  In plain English this means you often can't connect to a site or service because your ISP's DNS servers haven't gotten word of the new IP address (probably because they haven't checked).  There are also some that are notorious for ignoring TTL and not updating records for days!

But if you are lucky and smart enough to have your own Linux based DNS server you can do the following:

rndc dumpdb -cache

This let's you see the cached entries by writing the bind cache to /var/named/data/cache_dump.db

If you just want to clear your DNS cache:

rndc flush

The above flushes all of your DNS cache which is never a bad idea since it saves memory and increases the performance potentially.


Tags:

linux, bind, cache, isp, cached, ttl, dns, relevant, domain, servers, haven, ip, notorious, ignoring, updating, server, rndc, dumpdb, entries, var, cache_dump, db, rdnc, flush, flushes, saves, increases, potentially,

Latest Articles

  • CentOS 6 impossible to compile a newer libguestfs
  • chroot
  • How To Get Started on Ubuntu with gpt-2 OpenAI Text Prediction
  • Remove cloud-init in your VM
  • QEMU-KVM KVM Command Line Practical Guide
  • Linux How To Change NIC Name to eth0 instead of enps33 or enp0s25
  • virt-resize: error: libguestfs error: could not create appliance through libvirt.
  • Asterisk Does Not Retry When Authentication Fails
  • Linux Debian Ubuntu How To Install PEPPER Faster and Latest Adobe Flash Player in Firefox
  • How To Speed Up Linux Ubuntu and Debian Based Computers By Improving CPU Performance and Changing the CPU Governor
  • Convert data or file to base64 on a single line
  • Linux Mint Ubuntu Debian radeon slow 2D performance issues radeon_dp_aux_transfer_native: 158 callbacks suppressed
  • mdadm: super0.90 cannot open /dev/sdb1: Device or resource busy mdadm: /dev/sdb1 is not suitable for this array.
  • How To Install NextCloud on Centos 7 and Centos 8
  • AH01630: client denied by server configuration:
  • ERROR: Could not find a version that satisfies the requirement PIL (from versions: none) ERROR: No matching distribution found for PIL
  • ZTE Camera Cannot Work unable to connect to camera. Camera has been disabled becaue of security policies or is being used by other apps
  • QEMU KVM how to boot off a physical CD/DVD/BDROM Drive
  • How To Install OpenProject on Centos 7 Step-by-Step Guide
  • Ubuntu Debian Linux Cannot Install Wine Solution - wine1.6 : Depends: wine1.6-i386 (= 1:1.6.2-0ubuntu14.2) but it is not installable wine1.4 : Depends: wine1.6 but it is not going to be installed