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Resolve AWS EMR hostnames on MacOS
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macos-configure-aws-emr-dnsmasq.md

To resolve AWS EMR hostnames from your MacOS machine you'll need to install and configure dnsmasq:

brew install dnsmasq

Add the following to /usr/local/etc/dnsmasq.conf

# configure resolution of AWS EMR hostnames
address=/eu-west-1.compute.internal/127.0.0.1
synth-domain=eu-west-1.compute.internal,0.0.0.0,255.255.255.255,ip-

Start dnsmasq:

brew services start dnsmasq

Configure DNS for each network interface by going to "System Preferences", "Network", (for each adapter), "Advanced", "DNS". Take a screenshot! Click the "+" sign and add "127.0.0.1" and all entries that were already there (UI glitch...).

Try out resolution with:

dig ip-171-120-13.eu-west-1.compute.internal

Should return:

;; ANSWER SECTION:
ip-171-120-13.eu-west-1.compute.internal. 0 IN A 171.120.13
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