64 lines
1.9 KiB
Go
64 lines
1.9 KiB
Go
//go:build !windows
|
|
// +build !windows
|
|
|
|
/*
|
|
Copyright 2021 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 componentconfigs
|
|
|
|
import (
|
|
"k8s.io/klog/v2"
|
|
kubeletconfig "k8s.io/kubelet/config/v1beta1"
|
|
"k8s.io/utils/ptr"
|
|
|
|
"k8s.io/kubernetes/cmd/kubeadm/app/util/initsystem"
|
|
)
|
|
|
|
// Mutate allows applying pre-defined modifications to the config before it's marshaled.
|
|
func (kc *kubeletConfig) Mutate() error {
|
|
if err := mutateResolverConfig(&kc.config, isServiceActive); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// mutateResolverConfig mutates the ResolverConfig in the kubeletConfig dynamically.
|
|
func mutateResolverConfig(cfg *kubeletconfig.KubeletConfiguration, isServiceActiveFunc func(string) (bool, error)) error {
|
|
ok, err := isServiceActiveFunc("systemd-resolved")
|
|
if err != nil {
|
|
klog.Warningf("cannot determine if systemd-resolved is active: %v", err)
|
|
}
|
|
if ok {
|
|
if cfg.ResolverConfig == nil {
|
|
cfg.ResolverConfig = ptr.To(kubeletSystemdResolverConfig)
|
|
} else if *cfg.ResolverConfig != kubeletSystemdResolverConfig {
|
|
warnDefaultComponentConfigValue("KubeletConfiguration", "resolvConf",
|
|
kubeletSystemdResolverConfig, *cfg.ResolverConfig)
|
|
}
|
|
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// isServiceActive checks whether the given service exists and is running
|
|
func isServiceActive(name string) (bool, error) {
|
|
initSystem, err := initsystem.GetInitSystem()
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
return initSystem.ServiceIsActive(name), nil
|
|
}
|