mirror of https://github.com/k3s-io/k3s
342 lines
13 KiB
Go
342 lines
13 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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"io/ioutil"
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"net"
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"path/filepath"
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cadvisorapiv1 "github.com/google/cadvisor/info/v1"
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"k8s.io/klog"
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v1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/types"
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"k8s.io/kubernetes/pkg/kubelet/cm"
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"k8s.io/kubernetes/pkg/kubelet/config"
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kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
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utilfile "k8s.io/kubernetes/pkg/util/file"
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utilnode "k8s.io/kubernetes/pkg/util/node"
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volumeutil "k8s.io/kubernetes/pkg/volume/util"
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)
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// getRootDir returns the full path to the directory under which kubelet can
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// store data. These functions are useful to pass interfaces to other modules
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// that may need to know where to write data without getting a whole kubelet
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// instance.
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func (kl *Kubelet) getRootDir() string {
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return kl.rootDirectory
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}
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// getPodsDir returns the full path to the directory under which pod
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// directories are created.
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func (kl *Kubelet) getPodsDir() string {
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return filepath.Join(kl.getRootDir(), config.DefaultKubeletPodsDirName)
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}
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// getPluginsDir returns the full path to the directory under which plugin
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// directories are created. Plugins can use these directories for data that
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// they need to persist. Plugins should create subdirectories under this named
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// after their own names.
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func (kl *Kubelet) getPluginsDir() string {
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return filepath.Join(kl.getRootDir(), config.DefaultKubeletPluginsDirName)
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}
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// getPluginsRegistrationDir returns the full path to the directory under which
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// plugins socket should be placed to be registered.
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// More information is available about plugin registration in the pluginwatcher
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// module
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func (kl *Kubelet) getPluginsRegistrationDir() string {
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return filepath.Join(kl.getRootDir(), config.DefaultKubeletPluginsRegistrationDirName)
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}
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// getPluginDir returns a data directory name for a given plugin name.
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// Plugins can use these directories to store data that they need to persist.
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// For per-pod plugin data, see getPodPluginDir.
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func (kl *Kubelet) getPluginDir(pluginName string) string {
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return filepath.Join(kl.getPluginsDir(), pluginName)
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}
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// getVolumeDevicePluginsDir returns the full path to the directory under which plugin
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// directories are created. Plugins can use these directories for data that
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// they need to persist. Plugins should create subdirectories under this named
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// after their own names.
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func (kl *Kubelet) getVolumeDevicePluginsDir() string {
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return filepath.Join(kl.getRootDir(), config.DefaultKubeletPluginsDirName)
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}
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// getVolumeDevicePluginDir returns a data directory name for a given plugin name.
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// Plugins can use these directories to store data that they need to persist.
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// For per-pod plugin data, see getVolumeDevicePluginsDir.
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func (kl *Kubelet) getVolumeDevicePluginDir(pluginName string) string {
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return filepath.Join(kl.getVolumeDevicePluginsDir(), pluginName, config.DefaultKubeletVolumeDevicesDirName)
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}
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// GetPodDir returns the full path to the per-pod data directory for the
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// specified pod. This directory may not exist if the pod does not exist.
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func (kl *Kubelet) GetPodDir(podUID types.UID) string {
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return kl.getPodDir(podUID)
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}
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// getPodDir returns the full path to the per-pod directory for the pod with
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// the given UID.
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func (kl *Kubelet) getPodDir(podUID types.UID) string {
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return filepath.Join(kl.getPodsDir(), string(podUID))
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}
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// getPodVolumesSubpathsDir returns the full path to the per-pod subpaths directory under
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// which subpath volumes are created for the specified pod. This directory may not
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// exist if the pod does not exist or subpaths are not specified.
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func (kl *Kubelet) getPodVolumeSubpathsDir(podUID types.UID) string {
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return filepath.Join(kl.getPodDir(podUID), config.DefaultKubeletVolumeSubpathsDirName)
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}
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// getPodVolumesDir returns the full path to the per-pod data directory under
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// which volumes are created for the specified pod. This directory may not
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// exist if the pod does not exist.
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func (kl *Kubelet) getPodVolumesDir(podUID types.UID) string {
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return filepath.Join(kl.getPodDir(podUID), config.DefaultKubeletVolumesDirName)
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}
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// getPodVolumeDir returns the full path to the directory which represents the
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// named volume under the named plugin for specified pod. This directory may not
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// exist if the pod does not exist.
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func (kl *Kubelet) getPodVolumeDir(podUID types.UID, pluginName string, volumeName string) string {
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return filepath.Join(kl.getPodVolumesDir(podUID), pluginName, volumeName)
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}
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// getPodVolumeDevicesDir returns the full path to the per-pod data directory under
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// which volumes are created for the specified pod. This directory may not
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// exist if the pod does not exist.
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func (kl *Kubelet) getPodVolumeDevicesDir(podUID types.UID) string {
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return filepath.Join(kl.getPodDir(podUID), config.DefaultKubeletVolumeDevicesDirName)
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}
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// getPodVolumeDeviceDir returns the full path to the directory which represents the
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// named plugin for specified pod. This directory may not exist if the pod does not exist.
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func (kl *Kubelet) getPodVolumeDeviceDir(podUID types.UID, pluginName string) string {
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return filepath.Join(kl.getPodVolumeDevicesDir(podUID), pluginName)
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}
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// getPodPluginsDir returns the full path to the per-pod data directory under
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// which plugins may store data for the specified pod. This directory may not
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// exist if the pod does not exist.
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func (kl *Kubelet) getPodPluginsDir(podUID types.UID) string {
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return filepath.Join(kl.getPodDir(podUID), config.DefaultKubeletPluginsDirName)
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}
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// getPodPluginDir returns a data directory name for a given plugin name for a
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// given pod UID. Plugins can use these directories to store data that they
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// need to persist. For non-per-pod plugin data, see getPluginDir.
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func (kl *Kubelet) getPodPluginDir(podUID types.UID, pluginName string) string {
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return filepath.Join(kl.getPodPluginsDir(podUID), pluginName)
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}
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// getPodContainerDir returns the full path to the per-pod data directory under
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// which container data is held for the specified pod. This directory may not
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// exist if the pod or container does not exist.
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func (kl *Kubelet) getPodContainerDir(podUID types.UID, ctrName string) string {
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return filepath.Join(kl.getPodDir(podUID), config.DefaultKubeletContainersDirName, ctrName)
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}
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// GetPods returns all pods bound to the kubelet and their spec, and the mirror
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// pods.
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func (kl *Kubelet) GetPods() []*v1.Pod {
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return kl.podManager.GetPods()
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}
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// GetRunningPods returns all pods running on kubelet from looking at the
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// container runtime cache. This function converts kubecontainer.Pod to
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// v1.Pod, so only the fields that exist in both kubecontainer.Pod and
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// v1.Pod are considered meaningful.
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func (kl *Kubelet) GetRunningPods() ([]*v1.Pod, error) {
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pods, err := kl.runtimeCache.GetPods()
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if err != nil {
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return nil, err
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}
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apiPods := make([]*v1.Pod, 0, len(pods))
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for _, pod := range pods {
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apiPods = append(apiPods, pod.ToAPIPod())
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}
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return apiPods, nil
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}
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// GetPodByFullName gets the pod with the given 'full' name, which
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// incorporates the namespace as well as whether the pod was found.
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func (kl *Kubelet) GetPodByFullName(podFullName string) (*v1.Pod, bool) {
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return kl.podManager.GetPodByFullName(podFullName)
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}
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// GetPodByName provides the first pod that matches namespace and name, as well
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// as whether the pod was found.
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func (kl *Kubelet) GetPodByName(namespace, name string) (*v1.Pod, bool) {
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return kl.podManager.GetPodByName(namespace, name)
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}
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// GetPodByCgroupfs provides the pod that maps to the specified cgroup, as well
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// as whether the pod was found.
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func (kl *Kubelet) GetPodByCgroupfs(cgroupfs string) (*v1.Pod, bool) {
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pcm := kl.containerManager.NewPodContainerManager()
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if result, podUID := pcm.IsPodCgroup(cgroupfs); result {
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return kl.podManager.GetPodByUID(podUID)
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}
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return nil, false
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}
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// GetHostname Returns the hostname as the kubelet sees it.
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func (kl *Kubelet) GetHostname() string {
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return kl.hostname
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}
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// getRuntime returns the current Runtime implementation in use by the kubelet.
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func (kl *Kubelet) getRuntime() kubecontainer.Runtime {
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return kl.containerRuntime
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}
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// GetNode returns the node info for the configured node name of this Kubelet.
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func (kl *Kubelet) GetNode() (*v1.Node, error) {
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if kl.kubeClient == nil {
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return kl.initialNode()
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}
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return kl.nodeInfo.GetNodeInfo(string(kl.nodeName))
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}
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// getNodeAnyWay() must return a *v1.Node which is required by RunGeneralPredicates().
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// The *v1.Node is obtained as follows:
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// Return kubelet's nodeInfo for this node, except on error or if in standalone mode,
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// in which case return a manufactured nodeInfo representing a node with no pods,
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// zero capacity, and the default labels.
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func (kl *Kubelet) getNodeAnyWay() (*v1.Node, error) {
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if kl.kubeClient != nil {
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if n, err := kl.nodeInfo.GetNodeInfo(string(kl.nodeName)); err == nil {
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return n, nil
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}
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}
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return kl.initialNode()
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}
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// GetNodeConfig returns the container manager node config.
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func (kl *Kubelet) GetNodeConfig() cm.NodeConfig {
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return kl.containerManager.GetNodeConfig()
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}
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// GetPodCgroupRoot returns the listeral cgroupfs value for the cgroup containing all pods
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func (kl *Kubelet) GetPodCgroupRoot() string {
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return kl.containerManager.GetPodCgroupRoot()
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}
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// GetHostIP returns host IP or nil in case of error.
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func (kl *Kubelet) GetHostIP() (net.IP, error) {
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node, err := kl.GetNode()
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if err != nil {
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return nil, fmt.Errorf("cannot get node: %v", err)
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}
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return utilnode.GetNodeHostIP(node)
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}
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// getHostIPAnyway attempts to return the host IP from kubelet's nodeInfo, or
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// the initialNode.
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func (kl *Kubelet) getHostIPAnyWay() (net.IP, error) {
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node, err := kl.getNodeAnyWay()
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if err != nil {
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return nil, err
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}
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return utilnode.GetNodeHostIP(node)
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}
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// GetExtraSupplementalGroupsForPod returns a list of the extra
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// supplemental groups for the Pod. These extra supplemental groups come
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// from annotations on persistent volumes that the pod depends on.
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func (kl *Kubelet) GetExtraSupplementalGroupsForPod(pod *v1.Pod) []int64 {
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return kl.volumeManager.GetExtraSupplementalGroupsForPod(pod)
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}
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// getPodVolumePathListFromDisk returns a list of the volume paths by reading the
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// volume directories for the given pod from the disk.
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func (kl *Kubelet) getPodVolumePathListFromDisk(podUID types.UID) ([]string, error) {
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volumes := []string{}
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podVolDir := kl.getPodVolumesDir(podUID)
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if pathExists, pathErr := volumeutil.PathExists(podVolDir); pathErr != nil {
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return volumes, fmt.Errorf("Error checking if path %q exists: %v", podVolDir, pathErr)
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} else if !pathExists {
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klog.Warningf("Path %q does not exist", podVolDir)
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return volumes, nil
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}
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volumePluginDirs, err := ioutil.ReadDir(podVolDir)
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if err != nil {
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klog.Errorf("Could not read directory %s: %v", podVolDir, err)
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return volumes, err
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}
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for _, volumePluginDir := range volumePluginDirs {
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volumePluginName := volumePluginDir.Name()
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volumePluginPath := filepath.Join(podVolDir, volumePluginName)
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volumeDirs, err := utilfile.ReadDirNoStat(volumePluginPath)
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if err != nil {
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return volumes, fmt.Errorf("Could not read directory %s: %v", volumePluginPath, err)
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}
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for _, volumeDir := range volumeDirs {
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volumes = append(volumes, filepath.Join(volumePluginPath, volumeDir))
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}
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}
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return volumes, nil
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}
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func (kl *Kubelet) getMountedVolumePathListFromDisk(podUID types.UID) ([]string, error) {
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mountedVolumes := []string{}
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volumePaths, err := kl.getPodVolumePathListFromDisk(podUID)
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if err != nil {
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return mountedVolumes, err
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}
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for _, volumePath := range volumePaths {
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isNotMount, err := kl.mounter.IsLikelyNotMountPoint(volumePath)
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if err != nil {
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return mountedVolumes, err
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}
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if !isNotMount {
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mountedVolumes = append(mountedVolumes, volumePath)
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}
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}
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return mountedVolumes, nil
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}
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// podVolumesSubpathsDirExists returns true if the pod volume-subpaths directory for
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// a given pod exists
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func (kl *Kubelet) podVolumeSubpathsDirExists(podUID types.UID) (bool, error) {
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podVolDir := kl.getPodVolumeSubpathsDir(podUID)
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if pathExists, pathErr := volumeutil.PathExists(podVolDir); pathErr != nil {
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return true, fmt.Errorf("Error checking if path %q exists: %v", podVolDir, pathErr)
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} else if !pathExists {
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return false, nil
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}
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return true, nil
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}
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// GetVersionInfo returns information about the version of cAdvisor in use.
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func (kl *Kubelet) GetVersionInfo() (*cadvisorapiv1.VersionInfo, error) {
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return kl.cadvisor.VersionInfo()
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}
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// GetCachedMachineInfo assumes that the machine info can't change without a reboot
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func (kl *Kubelet) GetCachedMachineInfo() (*cadvisorapiv1.MachineInfo, error) {
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return kl.machineInfo, nil
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}
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