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[v0.14.x] Configurable CoreDNS TTL #1626

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Jun 18, 2019
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[v0.14.x] Configurable CoreDNS TTL #1626

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3 changes: 3 additions & 0 deletions builtin/files/cluster.yaml.tmpl
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Original file line number Diff line number Diff line change
Expand Up @@ -1328,6 +1328,9 @@ kubeDns:
# - --neg-ttl=10
# - --no-ping

# When enabled, will modify the TTL of the coredns service.
# ttl: 30

# When enabled, will deploy kube-dns to K8s controllers instead of workers.
# deployToControllers: false

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3 changes: 2 additions & 1 deletion builtin/files/userdata/cloud-config-controller
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Expand Up @@ -3784,13 +3784,14 @@ write_files:
pods insecure
upstream
fallthrough in-addr.arpa ip6.arpa
ttl {{ .KubeDns.TTL }}
}
forward . /etc/resolv.conf {
except cluster.local
health_check 5s
}
prometheus :9153
cache 30
cache {{ .KubeDns.TTL }}
loop
reload
loadbalance
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1 change: 1 addition & 0 deletions pkg/api/cluster.go
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Expand Up @@ -154,6 +154,7 @@ func NewDefaultCluster() *Cluster {
Provider: "coredns",
NodeLocalResolver: false,
DeployToControllers: false,
TTL: 30,
Autoscaler: KubeDnsAutoscaler{
CoresPerReplica: 256,
NodesPerReplica: 16,
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1 change: 1 addition & 0 deletions pkg/api/types.go
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Expand Up @@ -209,6 +209,7 @@ type KubeDns struct {
NodeLocalResolver bool `yaml:"nodeLocalResolver"`
NodeLocalResolverOptions []string `yaml:"nodeLocalResolverOptions"`
DeployToControllers bool `yaml:"deployToControllers"`
TTL int `yaml:"ttl"`
Autoscaler KubeDnsAutoscaler `yaml:"autoscaler"`
}

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22 changes: 22 additions & 0 deletions pkg/model/cluster_test.go
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Expand Up @@ -1122,6 +1122,7 @@ func TestKubeDns(t *testing.T) {
Provider: "coredns",
NodeLocalResolver: false,
DeployToControllers: false,
TTL: 30,
Autoscaler: api.KubeDnsAutoscaler{
CoresPerReplica: 256,
NodesPerReplica: 16,
Expand All @@ -1139,6 +1140,7 @@ kubeDns:
Provider: "coredns",
NodeLocalResolver: false,
DeployToControllers: false,
TTL: 30,
Autoscaler: api.KubeDnsAutoscaler{
CoresPerReplica: 256,
NodesPerReplica: 16,
Expand All @@ -1160,6 +1162,7 @@ kubeDns:
Provider: "coredns",
NodeLocalResolver: true,
DeployToControllers: true,
TTL: 30,
Autoscaler: api.KubeDnsAutoscaler{
CoresPerReplica: 5,
NodesPerReplica: 10,
Expand All @@ -1176,6 +1179,25 @@ kubeDns:
Provider: "coredns",
NodeLocalResolver: false,
DeployToControllers: false,
TTL: 30,
Autoscaler: api.KubeDnsAutoscaler{
CoresPerReplica: 256,
NodesPerReplica: 16,
Min: 2,
},
},
},
{
conf: `
kubeDns:
provider: coredns
ttl: 5
`,
kubeDns: api.KubeDns{
Provider: "coredns",
NodeLocalResolver: false,
DeployToControllers: false,
TTL: 5,
Autoscaler: api.KubeDnsAutoscaler{
CoresPerReplica: 256,
NodesPerReplica: 16,
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