37d30a0815
The code was added to support rktnetes and non-CRI docker integrations. These legacy integrations have already been removed from the codebase. This change removes the compatibility code existing soley for the legacy integrations.
193 lines
8.5 KiB
Go
193 lines
8.5 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package kubelet
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import (
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"fmt"
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"github.com/golang/glog"
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"k8s.io/api/core/v1"
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runtimeapi "k8s.io/kubernetes/pkg/kubelet/apis/cri/runtime/v1alpha2"
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"k8s.io/kubernetes/pkg/kubelet/apis/kubeletconfig"
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utiliptables "k8s.io/kubernetes/pkg/util/iptables"
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)
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const (
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// KubeMarkMasqChain is the mark-for-masquerade chain
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// TODO: clean up this logic in kube-proxy
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KubeMarkMasqChain utiliptables.Chain = "KUBE-MARK-MASQ"
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// KubeMarkDropChain is the mark-for-drop chain
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KubeMarkDropChain utiliptables.Chain = "KUBE-MARK-DROP"
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// KubePostroutingChain is kubernetes postrouting rules
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KubePostroutingChain utiliptables.Chain = "KUBE-POSTROUTING"
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// KubeFirewallChain is kubernetes firewall rules
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KubeFirewallChain utiliptables.Chain = "KUBE-FIREWALL"
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)
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// effectiveHairpinMode determines the effective hairpin mode given the
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// configured mode, container runtime, and whether cbr0 should be configured.
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func effectiveHairpinMode(hairpinMode kubeletconfig.HairpinMode, networkPlugin string) (kubeletconfig.HairpinMode, error) {
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// The hairpin mode setting doesn't matter if:
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// - We're not using a bridge network. This is hard to check because we might
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// be using a plugin.
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// - It's set to hairpin-veth for a container runtime that doesn't know how
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// to set the hairpin flag on the veth's of containers. Currently the
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// docker runtime is the only one that understands this.
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// - It's set to "none".
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if hairpinMode == kubeletconfig.PromiscuousBridge || hairpinMode == kubeletconfig.HairpinVeth {
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if hairpinMode == kubeletconfig.PromiscuousBridge && networkPlugin != "kubenet" {
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// This is not a valid combination, since promiscuous-bridge only works on kubenet. Users might be using the
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// default values (from before the hairpin-mode flag existed) and we
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// should keep the old behavior.
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glog.Warningf("Hairpin mode set to %q but kubenet is not enabled, falling back to %q", hairpinMode, kubeletconfig.HairpinVeth)
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return kubeletconfig.HairpinVeth, nil
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}
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} else if hairpinMode != kubeletconfig.HairpinNone {
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return "", fmt.Errorf("unknown value: %q", hairpinMode)
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}
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return hairpinMode, nil
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}
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// providerRequiresNetworkingConfiguration returns whether the cloud provider
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// requires special networking configuration.
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func (kl *Kubelet) providerRequiresNetworkingConfiguration() bool {
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// TODO: We should have a mechanism to say whether native cloud provider
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// is used or whether we are using overlay networking. We should return
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// true for cloud providers if they implement Routes() interface and
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// we are not using overlay networking.
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if kl.cloud == nil || kl.cloud.ProviderName() != "gce" {
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return false
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}
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_, supported := kl.cloud.Routes()
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return supported
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}
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// updatePodCIDR updates the pod CIDR in the runtime state if it is different
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// from the current CIDR.
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func (kl *Kubelet) updatePodCIDR(cidr string) {
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podCIDR := kl.runtimeState.podCIDR()
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if podCIDR == cidr {
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return
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}
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// kubelet -> generic runtime -> runtime shim -> network plugin
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// docker/non-cri implementations have a passthrough UpdatePodCIDR
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if err := kl.getRuntime().UpdatePodCIDR(cidr); err != nil {
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glog.Errorf("Failed to update pod CIDR: %v", err)
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return
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}
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glog.Infof("Setting Pod CIDR: %v -> %v", podCIDR, cidr)
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kl.runtimeState.setPodCIDR(cidr)
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}
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// syncNetworkUtil ensures the network utility are present on host.
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// Network util includes:
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// 1. In nat table, KUBE-MARK-DROP rule to mark connections for dropping
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// Marked connection will be drop on INPUT/OUTPUT Chain in filter table
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// 2. In nat table, KUBE-MARK-MASQ rule to mark connections for SNAT
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// Marked connection will get SNAT on POSTROUTING Chain in nat table
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func (kl *Kubelet) syncNetworkUtil() {
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if kl.iptablesMasqueradeBit < 0 || kl.iptablesMasqueradeBit > 31 {
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glog.Errorf("invalid iptables-masquerade-bit %v not in [0, 31]", kl.iptablesMasqueradeBit)
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return
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}
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if kl.iptablesDropBit < 0 || kl.iptablesDropBit > 31 {
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glog.Errorf("invalid iptables-drop-bit %v not in [0, 31]", kl.iptablesDropBit)
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return
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}
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if kl.iptablesDropBit == kl.iptablesMasqueradeBit {
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glog.Errorf("iptables-masquerade-bit %v and iptables-drop-bit %v must be different", kl.iptablesMasqueradeBit, kl.iptablesDropBit)
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return
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}
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// Setup KUBE-MARK-DROP rules
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dropMark := getIPTablesMark(kl.iptablesDropBit)
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if _, err := kl.iptClient.EnsureChain(utiliptables.TableNAT, KubeMarkDropChain); err != nil {
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glog.Errorf("Failed to ensure that %s chain %s exists: %v", utiliptables.TableNAT, KubeMarkDropChain, err)
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return
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}
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if _, err := kl.iptClient.EnsureRule(utiliptables.Append, utiliptables.TableNAT, KubeMarkDropChain, "-j", "MARK", "--set-xmark", dropMark); err != nil {
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glog.Errorf("Failed to ensure marking rule for %v: %v", KubeMarkDropChain, err)
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return
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}
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if _, err := kl.iptClient.EnsureChain(utiliptables.TableFilter, KubeFirewallChain); err != nil {
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glog.Errorf("Failed to ensure that %s chain %s exists: %v", utiliptables.TableFilter, KubeFirewallChain, err)
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return
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}
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if _, err := kl.iptClient.EnsureRule(utiliptables.Append, utiliptables.TableFilter, KubeFirewallChain,
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"-m", "comment", "--comment", "kubernetes firewall for dropping marked packets",
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"-m", "mark", "--mark", dropMark,
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"-j", "DROP"); err != nil {
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glog.Errorf("Failed to ensure rule to drop packet marked by %v in %v chain %v: %v", KubeMarkDropChain, utiliptables.TableFilter, KubeFirewallChain, err)
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return
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}
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if _, err := kl.iptClient.EnsureRule(utiliptables.Prepend, utiliptables.TableFilter, utiliptables.ChainOutput, "-j", string(KubeFirewallChain)); err != nil {
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glog.Errorf("Failed to ensure that %s chain %s jumps to %s: %v", utiliptables.TableFilter, utiliptables.ChainOutput, KubeFirewallChain, err)
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return
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}
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if _, err := kl.iptClient.EnsureRule(utiliptables.Prepend, utiliptables.TableFilter, utiliptables.ChainInput, "-j", string(KubeFirewallChain)); err != nil {
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glog.Errorf("Failed to ensure that %s chain %s jumps to %s: %v", utiliptables.TableFilter, utiliptables.ChainInput, KubeFirewallChain, err)
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return
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}
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// Setup KUBE-MARK-MASQ rules
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masqueradeMark := getIPTablesMark(kl.iptablesMasqueradeBit)
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if _, err := kl.iptClient.EnsureChain(utiliptables.TableNAT, KubeMarkMasqChain); err != nil {
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glog.Errorf("Failed to ensure that %s chain %s exists: %v", utiliptables.TableNAT, KubeMarkMasqChain, err)
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return
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}
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if _, err := kl.iptClient.EnsureChain(utiliptables.TableNAT, KubePostroutingChain); err != nil {
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glog.Errorf("Failed to ensure that %s chain %s exists: %v", utiliptables.TableNAT, KubePostroutingChain, err)
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return
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}
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if _, err := kl.iptClient.EnsureRule(utiliptables.Append, utiliptables.TableNAT, KubeMarkMasqChain, "-j", "MARK", "--set-xmark", masqueradeMark); err != nil {
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glog.Errorf("Failed to ensure marking rule for %v: %v", KubeMarkMasqChain, err)
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return
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}
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if _, err := kl.iptClient.EnsureRule(utiliptables.Prepend, utiliptables.TableNAT, utiliptables.ChainPostrouting,
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"-m", "comment", "--comment", "kubernetes postrouting rules", "-j", string(KubePostroutingChain)); err != nil {
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glog.Errorf("Failed to ensure that %s chain %s jumps to %s: %v", utiliptables.TableNAT, utiliptables.ChainPostrouting, KubePostroutingChain, err)
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return
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}
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if _, err := kl.iptClient.EnsureRule(utiliptables.Append, utiliptables.TableNAT, KubePostroutingChain,
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"-m", "comment", "--comment", "kubernetes service traffic requiring SNAT",
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"-m", "mark", "--mark", masqueradeMark, "-j", "MASQUERADE"); err != nil {
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glog.Errorf("Failed to ensure SNAT rule for packets marked by %v in %v chain %v: %v", KubeMarkMasqChain, utiliptables.TableNAT, KubePostroutingChain, err)
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return
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}
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}
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// getIPTablesMark returns the fwmark given the bit
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func getIPTablesMark(bit int) string {
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value := 1 << uint(bit)
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return fmt.Sprintf("%#08x/%#08x", value, value)
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}
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// GetPodDNS returns DNS settings for the pod.
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// This function is defined in kubecontainer.RuntimeHelper interface so we
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// have to implement it.
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func (kl *Kubelet) GetPodDNS(pod *v1.Pod) (*runtimeapi.DNSConfig, error) {
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return kl.dnsConfigurer.GetPodDNS(pod)
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}
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