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At $WORK we lost a disk in the RAID1 of one of our external nameservers, and it rekindled an occasional discussion of migration from ISC BIND to PowerDNS. PowerDNS has separate authoritative and recursive servers, and doesn’t seem to natively support views or split-horizon the way BIND does, but it has some really cool features including very mature database backends, load balancing, Lua scripting support to modify how recursive queries are answered, and geolocation or IP-range based query results.

While this project is still just casual research, I thought I’d share some of the useful links and information I’ve found:

PowerDNS Front-ends:

  • JPowerAdmin - One of the two most popular, a GPLv3 Java (JBoss SEAM) based web UI with a RESTful API, with support for “multiple” database backends. Sponsored by Nicmus, Inc. Online demo (demo:demo). Looks nice, simple UI, but no support for split-horizon.
  • PowerAdmin - the other most popular, though it seems to be undergoing a large overhaul at the moment. Has full support for most of PowerDNS’s features, written in PHP, supports “large” databases, fine-grained user permissions, RFC validation, zone templates. Online demo (demo:demo). I don’t really like that it manages the SOAs as full text (without any templating, dropdowns or default values), and that it doesn’t prepopulate default values for TTL in the new record form, but it looks like a good starting place for someone (like me) who’s handy with PHP.
  • pdns-gui - PowerDNS GUI - Google Project Hosting - PHP/MySQL GUI. Online demo. Handles templates nicely but won’t scale to too many of them. Window-based UI is visually pleasing but will probably be a problem for big zones.
  • powerdns-webinterface - PowerDNS Webinterface - Google Project Hosting - A nice but relatively simplistic UI written in PHP. It has some nice features like multi-user authentication (and logging, though I haven’t looked into how detailed it is), automatic SOA serial update, automatic PTR creation, etc. Unfortunately not geared towards people with lots of domains and multiple records; it has only one template for new domains (and no way to update domains created from a template), no easy filtering, and still treats SOA like a single text record.
  • ZoneAdmin | SourceForge.net and Project website - Maybe not the fastest tool to use in bulk, but a nice, relatively intuitive and full-featured admin tool. Online demo (demo:demo).

Some links on PowerDNS split-horizon

It looks to me that split-horizon is going to be the hardest part for us, at least to also have a web UI to manage it. It looks like with PowerDNS, the most common way to run split horizon DNS (views) is to run two separate sets of servers or instances, either on different boxes or multi-homed; one for internal and one for external. While that sounds like quite a bit of overhead beyond what BIND does, the real problem is finding a web UI that supports it; I don’t care if it’s in two separate databases, but what I want is a logical (web UI) view that has zones made up of resource names (i.e. the leftmost column in a zone file) with one or two RRs (type, ttl, priority, value) - one for each view. That’s the real catch - all of our machines are in private IP space behind a firewall, so I need to be able to manage the internal and external records on one screen. While it’s not exactly scalable, and the code stagnated quite a bit once I got it to a point that was usable for me, this was the main goal of my MultiBIND Admin project.


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