Erlang not resolving reverse DNS names in docker swarm overlay

[Benoit BARTHELEMY]

Hi !

I'm trying to setup a correct rabbitMQ cluster un swarm mode 1.13 using an overlay  network and I've got a weird issue : Erlang doesn't resolve reverse DNS correctly using inet_res:gethostbyaddr !

I manage to have correct direct resolution (A record) and both direct and reverse resolution using DIG but not with erlang :

1> inet_res:lookup("tasks.worker", in, a).

[{10,3,250,5},{10,3,250,4},{10,3,250,3}]

2> inet_res:gethostbyaddr({10,3,250,5}).

{error,timeout}

3> 

same works with dig :

bash-4.3$ dig +short tasks.worker

10.3.250.5

10.3.250.4

10.3.250.3

bash-4.3$ dig +short -x 10.3.250.3

rabbit_worker.qza1qo1e965lc6lsjv0a6xl3y.xjcjs6fivxk4dxwxxv7wz3brv.rabbit_cluster.

bash-4.3$ 

Is there any special setup to use in inet_rc to have rDNS working ?

Thanks !

[Jay Clark]

Having exact same issue.

Did you have any luck resolving it? (no pun intended)

[brian....@ontrackretail.co.uk]

Yeah, I'm getting this on Docker swarm 1.2.8 with Erlang v.1.2.8.  My dream of automatic clusters of rabbitmq containers in flames!