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net: add mechanism to dump DNS strategy #11322

bradfitz opened this issue Jun 22, 2015 · 1 comment


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commented Jun 22, 2015

In Go 1.5, the net package will prefer to do its own DNS lookups, rather than using cgo if the nsswitch.conf and resolv.conf files (which are now parsed) permit.

Users will inevitably find problems with DNS resolution (as they have in every release in the past: whether it's with fd exhaustion, or the results themselves), and we'll need a way to debug which of the two paths users' code is going. We don't have such a mechanism now.

Perhaps a GODEBUG environment variable key ("GODEBUG=netdns=1") which causes the net package to print its decisions about how it'll do DNS, at least the first time.

@bradfitz bradfitz self-assigned this Jun 22, 2015

@bradfitz bradfitz added this to the Go1.5 milestone Jun 22, 2015


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commented Jun 29, 2015

CL mentions this issue.

@bradfitz bradfitz closed this in b615ad8 Jul 9, 2015

@golang golang locked and limited conversation to collaborators Jul 11, 2016

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