Package com.netflix.discovery.shared.resolver.aws

Class DnsTxtRecordClusterResolver

java.lang.Object

com.netflix.discovery.shared.resolver.aws.DnsTxtRecordClusterResolver

All Implemented Interfaces:

ClusterResolver<AwsEndpoint>

public class DnsTxtRecordClusterResolver
extends java.lang.Object
implements ClusterResolver<AwsEndpoint>

A cluster resolver implementation that assumes that Eureka cluster configuration is provided in two level, cascading DNS TXT records. The first level shall point to zone level DNS entries, while at the zone level server pools shall be provided (either CNAMEs or A records). If no TXT record is found at the provided address, the resolver will add 'txt.' suffix to the address, and try to resolve that address.

Example

Lets assume we have a service with root domain myservice.net, and a deployment in AWS us-east-1 on all three zones. The root discovery domain would be:

DNS record	TXT record content
txt.myservice.net	txt.us-east-1a.myservice.net txt.us-east-1b.myservice.net txt.us-east-1c.myservice.net
txt.us-east-1a.myservice.net	ec2-1-2-3-4.compute-1.amazonaws.com ec2-1-2-3-5.compute-1.amazonaws.com
txt.us-east-1b.myservice.net	ec2-1-2-3-6.compute-1.amazonaws.com ec2-1-2-3-7.compute-1.amazonaws.com
txt.us-east-1c.myservice.net	ec2-1-2-3-8.compute-1.amazonaws.com ec2-1-2-3-9.compute-1.amazonaws.com

Constructor Summary

Constructors

Constructor	Description
DnsTxtRecordClusterResolver(java.lang.String region, java.lang.String rootClusterDNS, boolean extractZoneFromDNS, int port, boolean isSecure, java.lang.String relativeUri)

Method Summary

Modifier and Type	Method	Description
java.util.List<AwsEndpoint>	getClusterEndpoints()
java.lang.String	getRegion()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DnsTxtRecordClusterResolver

public DnsTxtRecordClusterResolver(java.lang.String region,
                                   java.lang.String rootClusterDNS,
                                   boolean extractZoneFromDNS,
                                   int port,
                                   boolean isSecure,
                                   java.lang.String relativeUri)

Parameters:

rootClusterDNS - top level domain name, in the two level hierarchy (see DnsTxtRecordClusterResolver documentation).

extractZoneFromDNS - if set to true, zone information will be extract from zone DNS name. It assumed that the zone name is the name part immediately followint 'txt.' suffix.

port - Eureka sever port number

relativeUri - service relative URI that will be appended to server address

Method Detail

getRegion

public java.lang.String getRegion()

Specified by:

getRegion in interface ClusterResolver<AwsEndpoint>

getClusterEndpoints

public java.util.List<AwsEndpoint> getClusterEndpoints()

Specified by:

getClusterEndpoints in interface ClusterResolver<AwsEndpoint>