How to set env.sh.eex for DNSCluster?

Questions & Help Questions
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edit:

make sure myapp.internal resolve A record dns both ip 192.168.1.2, 192.168.1.1

# Example, check using iex
iex(app@172.19.0.5)1> :inet_res.lookup(~c"chat.internal", :in, :a)
[{172, 19, 0, 5}]
iex(app@172.19.0.5)2>