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Fixed forming of pod's Search line in resolv.conf:

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- exclude duplicates while merging of host's and dns' search lines to form pod's one
 - truncate pod's search line if it exceeds resolver limits: is > 255 chars and containes > 6 searches
 - monitoring the resolv.conf file which is used by kubelet (set thru --resolv-conf="") and logging and eventing if search line in it consists of more than 3 entries
   (or 6 if Cluster Domain is set) or its lenght is > 255 chars
 - logging and eventing when a pod's search line is > 255 chars or containes > 6 searches during forming
Fixes #29270
This commit is contained in:
vefimova
2016-07-27 08:53:18 +00:00
parent 0ca72d110d
commit d925439727
4 changed files with 208 additions and 10 deletions
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6
pkg/kubelet/kubelet_pods_test.go
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@@ -210,7 +210,11 @@ func TestGenerateRunContainerOptions_DNSConfigurationParams(t *testing.T) {
} else if options[0].DNS[0] != clusterNS {
t.Errorf("expected nameserver %s, got %v", clusterNS, options[0].DNS[0])
}
if len(options[0].DNSSearch) != len(options[1].DNSSearch)+3 {
expLength := len(options[1].DNSSearch) + 3
if expLength > 6 {
expLength = 6
}
if len(options[0].DNSSearch) != expLength {
t.Errorf("expected prepend of cluster domain, got %+v", options[0].DNSSearch)
} else if options[0].DNSSearch[0] != ".svc."+kubelet.clusterDomain {
t.Errorf("expected domain %s, got %s", ".svc."+kubelet.clusterDomain, options[0].DNSSearch)