route53

README

route53

Name

route53 - enables serving zone data from AWS route53.

Description

The route53 plugin is useful for serving zones from resource record sets in AWS route53. This plugin supports all Amazon Route 53 records (https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/ResourceRecordTypes.html). The route53 plugin can be used when CoreDNS is deployed on AWS or elsewhere.

Syntax

route53 [ZONE:HOSTED_ZONE_ID...] {
    aws_access_key [AWS_ACCESS_KEY_ID AWS_SECRET_ACCESS_KEY] # Deprecated, uses other authentication methods instead.
    aws_endpoint ENDPOINT
    credentials PROFILE [FILENAME]
    fallthrough [ZONES...]
    refresh DURATION
}

• ZONE the name of the domain to be accessed. When there are multiple zones with overlapping domains (private vs. public hosted zone), CoreDNS does the lookup in the given order here. Therefore, for a non-existing resource record, SOA response will be from the rightmost zone.

• HOSTED_ZONE_ID the ID of the hosted zone that contains the resource record sets to be accessed.

• AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY the AWS access key ID and secret access key to be used when querying AWS (optional). If they are not provided, CoreDNS tries to access AWS credentials the same way as AWS CLI - environment variables, shared credential file (and optionally shared config file if AWS_SDK_LOAD_CONFIG env is set), and lastly EC2 Instance Roles. Note the usage of aws_access_key has been deprecated and may be removed in future versions. Instead, user can use other methods to pass crentials, e.g., with environmental variable AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY, respectively.

• aws_endpoint can be used to control the endpoint to use when querying AWS (optional). ENDPOINT is the URL of the endpoint to use. If this is not provided the default AWS endpoint resolution will occur.

• credentials is used for overriding the shared credentials FILENAME and the PROFILE name for a given zone. PROFILE is the AWS account profile name. Defaults to default. FILENAME is the AWS shared credentials filename, defaults to ~/.aws/credentials. CoreDNS will only load shared credentials file and not shared config file (~/.aws/config) by default. Set AWS_SDK_LOAD_CONFIG env variable to a truthy value to enable also loading of ~/.aws/config (e.g. if you want to provide assumed IAM role configuration). Will be ignored if static keys are set via aws_access_key.

• fallthrough If zone matches and no record can be generated, pass request to the next plugin. If ZONES is omitted, then fallthrough happens for all zones for which the plugin is authoritative. If specific zones are listed (for example in-addr.arpa and ip6.arpa), then only queries for those zones will be subject to fallthrough.

• refresh can be used to control how long between record retrievals from Route 53. It requires a duration string as a parameter to specify the duration between update cycles. Each update cycle may result in many AWS API calls depending on how many domains use this plugin and how many records are in each. Adjusting the update frequency may help reduce the potential of API rate-limiting imposed by AWS.

• DURATION A duration string. Defaults to 1m. If units are unspecified, seconds are assumed.

Examples

Enable route53 with implicit AWS credentials and resolve CNAMEs via 10.0.0.1:

example.org {
	route53 example.org.:Z1Z2Z3Z4DZ5Z6Z7
}

. {
    forward . 10.0.0.1
}

Enable route53 with explicit AWS credentials:

example.org {
    route53 example.org.:Z1Z2Z3Z4DZ5Z6Z7 {
      aws_access_key AWS_ACCESS_KEY_ID AWS_SECRET_ACCESS_KEY # Deprecated, uses other authentication methods instead.
    }
}

Enable route53 with an explicit AWS endpoint:

example.org {
    route53 example.org.:Z1Z2Z3Z4DZ5Z6Z7 {
      aws_endpoint https://test.us-west-2.amazonaws.com
    }
}

Enable route53 with fallthrough:

. {
    route53 example.org.:Z1Z2Z3Z4DZ5Z6Z7 example.gov.:Z654321543245 {
      fallthrough example.gov.
    }
}

Enable route53 with multiple hosted zones with the same domain:

example.org {
    route53 example.org.:Z1Z2Z3Z4DZ5Z6Z7 example.org.:Z93A52145678156
}

Enable route53 and refresh records every 3 minutes

example.org {
    route53 example.org.:Z1Z2Z3Z4DZ5Z6Z7 {
      refresh 3m
    }
}

Authentication

Route53 plugin uses AWS Go SDK for authentication, where there is a list of accepted configuration methods. Note the usage of aws_access_key in Corefile has been deprecated and may be removed in future versions. Instead, user can use other methods to pass crentials, e.g., with environmental variable AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY, respectively.

Documentation

Overview

Package route53 implements a plugin that returns resource records from AWS route53.

Index

• type Route53
  • func New(ctx context.Context, c route53iface.Route53API, keys map[string][]string, ...) (*Route53, error)
  • func (h *Route53) Name() string
  • func (h *Route53) Run(ctx context.Context) error
  • func (h *Route53) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error)

Types

type Route53

type Route53 struct {
	Next plugin.Handler
	Fall fall.F
	// contains filtered or unexported fields
}

Route53 is a plugin that returns RR from AWS route53.

func New

func New(ctx context.Context, c route53iface.Route53API, keys map[string][]string, refresh time.Duration) (*Route53, error)

New reads from the keys map which uses domain names as its key and hosted zone id lists as its values, validates that each domain name/zone id pair does exist, and returns a new *Route53. In addition to this, upstream is use for doing recursive queries against CNAMEs. Returns error if it cannot verify any given domain name/zone id pair.

func (*Route53) Name

func (h *Route53) Name() string

Name implements plugin.Handler.Name.

func (*Route53) Run

func (h *Route53) Run(ctx context.Context) error

Run executes first update, spins up an update forever-loop. Returns error if first update fails.

func (*Route53) ServeDNS

func (h *Route53) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error)

ServeDNS implements the plugin.Handler.ServeDNS.