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generate /etc/resolv.conf on mn, also keep the original logic for the dynamic query of "NS" record.

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git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@10220 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd
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sjing 2011-08-04 06:57:18 +00:00
parent 09f05896cc
commit bf4861084a
1 changed files with 74 additions and 0 deletions
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74
xCAT-server/lib/xcat/plugins/ddns.pm
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@ -422,6 +422,12 @@ sub process_request {
unlink $_;
}
}
if ($::XCATSITEVALS{useDNSonMN})
{
create_resolvconf_on_mn($ctx);
}
#We manipulate local namedconf
$ctx->{dbdir} = get_dbdir();
$ctx->{zonesdir} = get_zonesdir();
@ -1010,4 +1016,72 @@ sub makedns_usage
return 0;
}
sub create_resolvconf_on_mn
{
my $ctx = shift;
my $resolvlocation = "/etc/resolv.conf";
if ( -e $resolvlocation)
{
# backup the existing /etc/resolv.conf on mn if it's there
system("mv $resolvlocation $resolvlocation.xcatbak");
# put the foreign nameserver in site.forwarders
# get forwarders which are the nameserver entries in /etc/resolv.conf
# don't use if the address is this machine (Management Node)
my $forwarders;
# find out the names for the Management Node
my @MNnodeinfo = xCAT::Utils->determinehostname;
my $MNnodename = pop @MNnodeinfo; # hostname
my @MNnodeipaddr = @MNnodeinfo; # ipaddresses
my @names;
my @tmpnames =
xCAT::Utils->runcmd("/bin/grep ^[^#]*nameserver $resolvlocation.xcatbak | awk '{print \$2}'", -1);
foreach my $ip (@tmpnames)
{
if (!grep(/$ip/, @MNnodeipaddr))
{ # if not the MN
push @names,$ip; # add it as a forwarder
}
}
if (@names)
{
if ($ctx->{forwarders})
{
my $curforwarders = join(',', @{$ctx->{forwarders}});
foreach my $name (@names)
{
if (!grep(/$name/, $curforwarders))
{
$forwarders = $curforwarders . ",$name";
push @{$ctx->{forwarders}}, $name;
}
}
}
else
{
$forwarders = join(',', @names);
$ctx->{forwarders} = \@names;
}
system("$::XCATROOT/sbin/chtab key=forwarders site.value=$forwarders;");
}
}
# create the new /etc/resolv.conf pointing to mn itself
my @newresolv;
push @newresolv, "search $ctx->{domain}\n";
push @newresolv, "nameserver $::XCATSITEVALS{master}\n";
my $newresolvconf;
open($newresolvconf,">",$resolvlocation);
flock($newresolvconf,LOCK_EX);
seek($newresolvconf,0,0);
truncate($newresolvconf,0);
for my $l (@newresolv) { print $newresolvconf $l; }
flock($newresolvconf,LOCK_UN);
close($newresolvconf);
return;
}
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