mirror of https://github.com/k3s-io/k3s
80 lines
2.6 KiB
Go
80 lines
2.6 KiB
Go
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/*
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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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"k8s.io/api/core/v1"
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"k8s.io/klog"
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runtimeapi "k8s.io/kubernetes/pkg/kubelet/apis/cri/runtime/v1alpha2"
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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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// 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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return false
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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. Return true if pod CIDR is actually changed.
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func (kl *Kubelet) updatePodCIDR(cidr string) (bool, error) {
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kl.updatePodCIDRMux.Lock()
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defer kl.updatePodCIDRMux.Unlock()
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podCIDR := kl.runtimeState.podCIDR()
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if podCIDR == cidr {
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return false, nil
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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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// If updatePodCIDR would fail, theoretically pod CIDR could not change.
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// But it is better to be on the safe side to still return true here.
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return true, fmt.Errorf("failed to update pod CIDR: %v", err)
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}
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klog.Infof("Setting Pod CIDR: %v -> %v", podCIDR, cidr)
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kl.runtimeState.setPodCIDR(cidr)
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return true, nil
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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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