Problem with Amazon S3 and varnish

[Abraham Cruz Sustaita]

I have this configuration:

# Amazon S3 Backend Metatube
# --
backend s3 {
  .host = "metatube.s3-website-us-east-1.amazonaws.com";
  .port = "80";
}

But the amazon url sometimes resolves to more of one IP (I guess is a
normal behaviour from Amazon), so I have to try several times to load the
configuration file (via varnishadm) until it compiles correctly. The
problem is I have a 5 different domains with amazon, so when finally one of
them resolves to just one IP, the others resolve to more than one, so I can
never compile the configuration file. Is there anyway to fix this via
configuration?
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