Update Multiple DNS Zones with Find and Replace


This article provides a guide for how to update multiple DNS zones with find and replace (sed). This guide is intended for WHM cPanel VPS and dedicated server administrators.

How to Update Multiple DNS Zones with Find and Replace (sed)

We can use sed (a find and replace command line tool) to quickly replace all instances of a specific string in DNS zones with another string.

For example, if several DNS zones are using the NS value 'ns1.servername.us' but you want to replace it with 'ns1.serverprovider.net', then this would be a perfect application of this tool.

To update multiple DNS zones with find and replace using sed, follow the steps below:

  1. Login via SSH as root.
  2. Run the following commands:
    cd /var
    cp -R named named.backup060924
    sed -i 's/ns1.servername.us/ns1.serverprovider.net/g' /var/named/*.db
    sed -i 's/ns2.servername.us/ns2.serverprovider.net/g' /var/named/*.db
    sed -i 's/2024060601/2024060921/g' /var/named/*.db
    systemctl restart named
    systemctl status named

These commands will take a full backup of the 'named' directory, replace every instance of 'ns1.servername.us' with 'ns1.serverprovider.net' and every instance of 'ns2.servername.us' with 'ns2.serverprovider.net', update the zone serial numbers, and restart named.

Conclusion

You now know how to update multiple DNS zones with find and replace, using sed.

  • sed, dns records, named
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