Zoned 0.1.1

Zoned project provides DNS zone database clustering for BIND9.

Zoned works in conjunction with the BDBHPT DLZ module for BIND9 (9.4.0+). Zoned manages the backing-store Berkeley DB database, and utilizes the Berkeley DB Replication Base API to provide high availability and load distribution to a coherent DNS zone infrastructure.

Zoned includes the zoned(1) server replication node, zonectl(1) command line utility for managing server nodes and editing DNS zone records, and a Perl module, Zoned. All changes to DNS zone data must be processed through a Zoned node, preferably using the command-line utility or Perl library. Alternatively, an ASN.1 message schema definition is provided, defining the messaging protocol for node communication, which can be used to build your own tools for interacting with the cluster.

Zoned and Berkeley DB autonomously manage the cluster and cluster messaging (including transparently routing all zoned edits to the master, per BerkeleyDB Replication requirements). You must enumerate cluster nodes through SRV resource records. This list specifies all nodes which should participate in the cluster, not necessarily all available nodes. This list determines who and where each node should peer with, and serves as a parameter to determining whether a transaction has been successfully committed (more than one-half of enumerated nodes have written out a zone edit). The SRV node enumeration modifications are automatically detected with a configurable check interval.

To compile Zoned you need: GNU Make, libarena, libevnet, libevent, asn1c, and Lua.

Zoned has been successfully compiled and run on Debian GNU/Linux i386, and OpenBSD 4.0 AMD64 platforms. Zoned is new software, and it may take some elbow grease to build properly.

libevnet requires C-Ares and OpenSSL.

Zoned is a Work-in-Progress. Node authentication is not yet implemented, but will use TLS and X.509 certificate verification. Currently node discovery occurs through an SRV query, which is expected to enumerate all current nodes.