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dnsmasq in osx (macSierra) to resolve aws internal ip's
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awsips-dnsmasq.md

AWS internal ip's

EMR has components running on internal ip's such as ip-172-23-53-101.ec2.internal. To resolve to the implied public/vpn IP's, setup dnsmasq

Setup dnsmasq

$ brew install dnsmasq

Configure dnsmasq

$ cp /usr/local/Cellar/dnsmasq/2.76/dnsmasq.conf.example /usr/local/etc/dnsmasq.conf
$ vim /usr/local/etc/dnsmasq.conf # add following to the end of the file
.....
....
# ashee: 03/19/2017
# AWS IPs see - http://stackoverflow.com/questions/28204678/dns-service-to-dynamically-resolve-subdomain-to-a-custom-ip-address
address=/ec2.internal/127.0.0.1
synth-domain=ec2.internal,0.0.0.0,255.255.255.255,ip-

Start dnsmasq

$ sudo brew services start dnsmasq

Configure OSX with the new dnsserver

$ networksetup -setdnsserver Wi-Fi 127.0.0.1 8.8.8.8 # or whatever dns server you had to begin with

Test to see it working

$ dig ip-172-23-53-101.ec2.internal

; <<>> DiG 9.8.3-P1 <<>> @127.0.0.1 ip-172-23-53-101.ec2.internal
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 28487
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;ip-172-23-53-101.ec2.internal.	IN	A

;; ANSWER SECTION:
ip-172-23-53-101.ec2.internal. 0 IN	A	172.23.53.101

;; Query time: 0 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Mon Mar 13 19:25:03 2017
;; MSG SIZE  rcvd: 63
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