net: use DNS over TCP when use-vc is set in resolv.conf #29594
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This PR (HEAD: edaa76c) has been imported to Gerrit for code review. Please visit https://go-review.googlesource.com/c/go/+/156366 to see it. Tip: You can toggle comments from me using the |
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Message from Jean-François Bustarret: Patch Set 1: This is an alternate version of https://go-review.googlesource.com/c/go/+/155378, with a smaller impact. Feel free to reject one of the two. Please don’t reply on this GitHub thread. Visit golang.org/cl/156366. |
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Message from Brad Fitzpatrick: Patch Set 1: Code-Review+1 (4 comments) This seems reasonable to me given that glibc does this. And the change looks minimal. Please don’t reply on this GitHub thread. Visit golang.org/cl/156366. |
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This PR (HEAD: 8197318) has been imported to Gerrit for code review. Please visit https://go-review.googlesource.com/c/go/+/156366 to see it. Tip: You can toggle comments from me using the |
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Message from Jean-François Bustarret: Patch Set 2: TODO: add support for OpenBSD (options tcp) and FreeBSD (options usevc) Please don’t reply on this GitHub thread. Visit golang.org/cl/156366. |
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This PR (HEAD: 2b9348a) has been imported to Gerrit for code review. Please visit https://go-review.googlesource.com/c/go/+/156366 to see it. Tip: You can toggle comments from me using the |
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Message from Jean-François Bustarret: Patch Set 3: (4 comments) Please don’t reply on this GitHub thread. Visit golang.org/cl/156366. |
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This PR (HEAD: 70bc00f) has been imported to Gerrit for code review. Please visit https://go-review.googlesource.com/c/go/+/156366 to see it. Tip: You can toggle comments from me using the |
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Message from Jean-François Bustarret: Patch Set 4: PR has been rebased and conflicts have been resolved. Ready to review ! Please don’t reply on this GitHub thread. Visit golang.org/cl/156366. |
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Message from Brad Fitzpatrick: Patch Set 4: Run-TryBot+1 Please don’t reply on this GitHub thread. Visit golang.org/cl/156366. |
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Message from Gobot Gobot: Patch Set 4: TryBots beginning. Status page: https://farmer.golang.org/try?commit=9c0d3f19 Please don’t reply on this GitHub thread. Visit golang.org/cl/156366. |
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There is a DNS resolution bug in Kubernetes (UDP response packets get dropped by conntrack, causing timeouts in DNS queries). The recommended workaround on Linux is to configure the resolver to use TCP for DNS queries, by setting the use-vc option in resolv.conf. With this PR, the pure Go resolver searches for "use-vc" in resolv.conf and switches to TCP when found. Fixes #29358 Change-Id: I26b935cae2c80e5bb9955da83299a8dea84591de GitHub-Last-Rev: 70bc00f GitHub-Pull-Request: #29594 Reviewed-on: https://go-review.googlesource.com/c/go/+/156366 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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Message from Brad Fitzpatrick: Patch Set 4: RELNOTE=yes Please don’t reply on this GitHub thread. Visit golang.org/cl/156366. |
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Message from Brad Fitzpatrick: Patch Set 4: Code-Review+2 Please don’t reply on this GitHub thread. Visit golang.org/cl/156366. |
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This PR is being closed because golang.org/cl/156366 has been merged. |
There is a DNS resolution bug in Kubernetes (UDP response packets get dropped by conntrack, causing timeouts in DNS queries).
The recommended workaround on Linux is to configure the resolver to use TCP for DNS queries, by setting the use-vc option in resolv.conf.
With this PR, the pure Go resolver searches for "use-vc" in resolv.conf and switches to TCP when found.
Fixes #29358