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Merge pull request #45 from jcumming/brokendns.121021

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Add an option for putting options 'single-request' into /etc/resolv.conf
This commit is contained in:
Peter Simons 2012-10-23 10:39:30 -07:00
commit ae1d564c1c
1 changed files with 15 additions and 0 deletions
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15
modules/config/networking.nix
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@ -16,6 +16,18 @@ let
''; '';
}; };
networking.dnsSingleRequest = pkgs.lib.mkOption {
default = false;
description = ''
Recent versions of glibc will issue both ipv4 (A) and ipv6 (AAAA)
address queries at the same time, from the same port. Sometimes upstream
routers will systemically drop the ipv4 queries. The symptom of this problem is
that 'getent hosts example.com' only returns ipv6 (or perhaps only ipv4) addresses. The
workaround for this is to specify the option 'single-request' in
/etc/resolve.conf. This option enables that.
'';
};
}; };
in in
@ -60,6 +72,9 @@ in
# Invalidate the nscd cache whenever resolv.conf is # Invalidate the nscd cache whenever resolv.conf is
# regenerated. # regenerated.
libc_restart='${pkgs.upstart}/sbin/start invalidate-nscd' libc_restart='${pkgs.upstart}/sbin/start invalidate-nscd'
'' + optionalString cfg.dnsSingleRequest ''
# only send one DNS request at a time
resolv_conf_options='single-request'
'' + optionalString config.services.bind.enable '' '' + optionalString config.services.bind.enable ''
# This hosts runs a full-blown DNS resolver. # This hosts runs a full-blown DNS resolver.
name_servers='127.0.0.1' name_servers='127.0.0.1'