mirror of https://github.com/k3s-io/k3s
88 lines
2.9 KiB
Go
88 lines
2.9 KiB
Go
/*
|
|
Copyright 2016 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package kubelet
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"k8s.io/api/core/v1"
|
|
runtimeapi "k8s.io/cri-api/pkg/apis/runtime/v1alpha2"
|
|
"k8s.io/klog/v2"
|
|
utiliptables "k8s.io/kubernetes/pkg/util/iptables"
|
|
)
|
|
|
|
const (
|
|
// KubeMarkMasqChain is the mark-for-masquerade chain
|
|
// TODO: clean up this logic in kube-proxy
|
|
KubeMarkMasqChain utiliptables.Chain = "KUBE-MARK-MASQ"
|
|
|
|
// KubeMarkDropChain is the mark-for-drop chain
|
|
KubeMarkDropChain utiliptables.Chain = "KUBE-MARK-DROP"
|
|
|
|
// KubePostroutingChain is kubernetes postrouting rules
|
|
KubePostroutingChain utiliptables.Chain = "KUBE-POSTROUTING"
|
|
|
|
// KubeFirewallChain is kubernetes firewall rules
|
|
KubeFirewallChain utiliptables.Chain = "KUBE-FIREWALL"
|
|
)
|
|
|
|
// providerRequiresNetworkingConfiguration returns whether the cloud provider
|
|
// requires special networking configuration.
|
|
func (kl *Kubelet) providerRequiresNetworkingConfiguration() bool {
|
|
// TODO: We should have a mechanism to say whether native cloud provider
|
|
// is used or whether we are using overlay networking. We should return
|
|
// true for cloud providers if they implement Routes() interface and
|
|
// we are not using overlay networking.
|
|
if kl.cloud == nil || kl.cloud.ProviderName() != "gce" {
|
|
return false
|
|
}
|
|
_, supported := kl.cloud.Routes()
|
|
return supported
|
|
}
|
|
|
|
// updatePodCIDR updates the pod CIDR in the runtime state if it is different
|
|
// from the current CIDR. Return true if pod CIDR is actually changed.
|
|
func (kl *Kubelet) updatePodCIDR(cidr string) (bool, error) {
|
|
kl.updatePodCIDRMux.Lock()
|
|
defer kl.updatePodCIDRMux.Unlock()
|
|
|
|
podCIDR := kl.runtimeState.podCIDR()
|
|
|
|
if podCIDR == cidr {
|
|
return false, nil
|
|
}
|
|
|
|
// kubelet -> generic runtime -> runtime shim -> network plugin
|
|
// docker/non-cri implementations have a passthrough UpdatePodCIDR
|
|
if err := kl.getRuntime().UpdatePodCIDR(cidr); err != nil {
|
|
// If updatePodCIDR would fail, theoretically pod CIDR could not change.
|
|
// But it is better to be on the safe side to still return true here.
|
|
return true, fmt.Errorf("failed to update pod CIDR: %v", err)
|
|
}
|
|
|
|
klog.Infof("Setting Pod CIDR: %v -> %v", podCIDR, cidr)
|
|
kl.runtimeState.setPodCIDR(cidr)
|
|
return true, nil
|
|
}
|
|
|
|
// GetPodDNS returns DNS settings for the pod.
|
|
// This function is defined in kubecontainer.RuntimeHelper interface so we
|
|
// have to implement it.
|
|
func (kl *Kubelet) GetPodDNS(pod *v1.Pod) (*runtimeapi.DNSConfig, error) {
|
|
return kl.dnsConfigurer.GetPodDNS(pod)
|
|
}
|