mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-11 07:30:24 +00:00
3af1e26d7c
Signed-off-by: Humble Chirammal <hchiramm@redhat.com>
640 lines
22 KiB
Go
640 lines
22 KiB
Go
/*
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Copyright 2015 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 container
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import (
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"context"
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"fmt"
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"io"
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"net/url"
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"reflect"
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"strings"
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"time"
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"k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/types"
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"k8s.io/client-go/tools/remotecommand"
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"k8s.io/client-go/util/flowcontrol"
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runtimeapi "k8s.io/cri-api/pkg/apis/runtime/v1alpha2"
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"k8s.io/klog"
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"k8s.io/kubernetes/pkg/volume"
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)
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type Version interface {
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// Compare compares two versions of the runtime. On success it returns -1
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// if the version is less than the other, 1 if it is greater than the other,
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// or 0 if they are equal.
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Compare(other string) (int, error)
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// String returns a string that represents the version.
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String() string
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}
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// ImageSpec is an internal representation of an image. Currently, it wraps the
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// value of a Container's Image field, but in the future it will include more detailed
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// information about the different image types.
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type ImageSpec struct {
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Image string
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}
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// ImageStats contains statistics about all the images currently available.
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type ImageStats struct {
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// Total amount of storage consumed by existing images.
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TotalStorageBytes uint64
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}
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// Runtime interface defines the interfaces that should be implemented
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// by a container runtime.
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// Thread safety is required from implementations of this interface.
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type Runtime interface {
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// Type returns the type of the container runtime.
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Type() string
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//SupportsSingleFileMapping returns whether the container runtime supports single file mappings or not.
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SupportsSingleFileMapping() bool
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// Version returns the version information of the container runtime.
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Version() (Version, error)
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// APIVersion returns the cached API version information of the container
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// runtime. Implementation is expected to update this cache periodically.
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// This may be different from the runtime engine's version.
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// TODO(random-liu): We should fold this into Version()
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APIVersion() (Version, error)
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// Status returns the status of the runtime. An error is returned if the Status
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// function itself fails, nil otherwise.
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Status() (*RuntimeStatus, error)
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// GetPods returns a list of containers grouped by pods. The boolean parameter
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// specifies whether the runtime returns all containers including those already
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// exited and dead containers (used for garbage collection).
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GetPods(all bool) ([]*Pod, error)
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// GarbageCollect removes dead containers using the specified container gc policy
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// If allSourcesReady is not true, it means that kubelet doesn't have the
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// complete list of pods from all avialble sources (e.g., apiserver, http,
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// file). In this case, garbage collector should refrain itself from aggressive
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// behavior such as removing all containers of unrecognized pods (yet).
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// If evictNonDeletedPods is set to true, containers and sandboxes belonging to pods
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// that are terminated, but not deleted will be evicted. Otherwise, only deleted pods will be GC'd.
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// TODO: Revisit this method and make it cleaner.
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GarbageCollect(gcPolicy ContainerGCPolicy, allSourcesReady bool, evictNonDeletedPods bool) error
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// Syncs the running pod into the desired pod.
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SyncPod(pod *v1.Pod, podStatus *PodStatus, pullSecrets []v1.Secret, backOff *flowcontrol.Backoff) PodSyncResult
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// KillPod kills all the containers of a pod. Pod may be nil, running pod must not be.
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// TODO(random-liu): Return PodSyncResult in KillPod.
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// gracePeriodOverride if specified allows the caller to override the pod default grace period.
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// only hard kill paths are allowed to specify a gracePeriodOverride in the kubelet in order to not corrupt user data.
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// it is useful when doing SIGKILL for hard eviction scenarios, or max grace period during soft eviction scenarios.
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KillPod(pod *v1.Pod, runningPod Pod, gracePeriodOverride *int64) error
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// GetPodStatus retrieves the status of the pod, including the
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// information of all containers in the pod that are visible in Runtime.
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GetPodStatus(uid types.UID, name, namespace string) (*PodStatus, error)
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// TODO(vmarmol): Unify pod and containerID args.
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// GetContainerLogs returns logs of a specific container. By
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// default, it returns a snapshot of the container log. Set 'follow' to true to
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// stream the log. Set 'follow' to false and specify the number of lines (e.g.
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// "100" or "all") to tail the log.
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GetContainerLogs(ctx context.Context, pod *v1.Pod, containerID ContainerID, logOptions *v1.PodLogOptions, stdout, stderr io.Writer) (err error)
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// Delete a container. If the container is still running, an error is returned.
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DeleteContainer(containerID ContainerID) error
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// ImageService provides methods to image-related methods.
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ImageService
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// UpdatePodCIDR sends a new podCIDR to the runtime.
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// This method just proxies a new runtimeConfig with the updated
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// CIDR value down to the runtime shim.
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UpdatePodCIDR(podCIDR string) error
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}
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// StreamingRuntime is the interface implemented by runtimes that handle the serving of the
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// streaming calls (exec/attach/port-forward) themselves. In this case, Kubelet should redirect to
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// the runtime server.
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type StreamingRuntime interface {
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GetExec(id ContainerID, cmd []string, stdin, stdout, stderr, tty bool) (*url.URL, error)
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GetAttach(id ContainerID, stdin, stdout, stderr, tty bool) (*url.URL, error)
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GetPortForward(podName, podNamespace string, podUID types.UID, ports []int32) (*url.URL, error)
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}
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type ImageService interface {
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// PullImage pulls an image from the network to local storage using the supplied
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// secrets if necessary. It returns a reference (digest or ID) to the pulled image.
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PullImage(image ImageSpec, pullSecrets []v1.Secret, podSandboxConfig *runtimeapi.PodSandboxConfig) (string, error)
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// GetImageRef gets the reference (digest or ID) of the image which has already been in
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// the local storage. It returns ("", nil) if the image isn't in the local storage.
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GetImageRef(image ImageSpec) (string, error)
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// Gets all images currently on the machine.
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ListImages() ([]Image, error)
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// Removes the specified image.
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RemoveImage(image ImageSpec) error
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// Returns Image statistics.
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ImageStats() (*ImageStats, error)
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}
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type ContainerAttacher interface {
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AttachContainer(id ContainerID, stdin io.Reader, stdout, stderr io.WriteCloser, tty bool, resize <-chan remotecommand.TerminalSize) (err error)
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}
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type ContainerCommandRunner interface {
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// RunInContainer synchronously executes the command in the container, and returns the output.
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// If the command completes with a non-0 exit code, a k8s.io/utils/exec.ExitError will be returned.
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RunInContainer(id ContainerID, cmd []string, timeout time.Duration) ([]byte, error)
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}
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// Pod is a group of containers.
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type Pod struct {
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// The ID of the pod, which can be used to retrieve a particular pod
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// from the pod list returned by GetPods().
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ID types.UID
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// The name and namespace of the pod, which is readable by human.
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Name string
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Namespace string
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// List of containers that belongs to this pod. It may contain only
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// running containers, or mixed with dead ones (when GetPods(true)).
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Containers []*Container
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// List of sandboxes associated with this pod. The sandboxes are converted
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// to Container temporariliy to avoid substantial changes to other
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// components. This is only populated by kuberuntime.
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// TODO: use the runtimeApi.PodSandbox type directly.
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Sandboxes []*Container
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}
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// PodPair contains both runtime#Pod and api#Pod
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type PodPair struct {
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// APIPod is the v1.Pod
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APIPod *v1.Pod
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// RunningPod is the pod defined in pkg/kubelet/container/runtime#Pod
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RunningPod *Pod
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}
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// ContainerID is a type that identifies a container.
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type ContainerID struct {
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// The type of the container runtime. e.g. 'docker'.
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Type string
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// The identification of the container, this is comsumable by
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// the underlying container runtime. (Note that the container
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// runtime interface still takes the whole struct as input).
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ID string
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}
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func BuildContainerID(typ, ID string) ContainerID {
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return ContainerID{Type: typ, ID: ID}
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}
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// Convenience method for creating a ContainerID from an ID string.
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func ParseContainerID(containerID string) ContainerID {
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var id ContainerID
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if err := id.ParseString(containerID); err != nil {
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klog.Error(err)
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}
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return id
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}
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func (c *ContainerID) ParseString(data string) error {
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// Trim the quotes and split the type and ID.
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parts := strings.Split(strings.Trim(data, "\""), "://")
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if len(parts) != 2 {
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return fmt.Errorf("invalid container ID: %q", data)
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}
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c.Type, c.ID = parts[0], parts[1]
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return nil
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}
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func (c *ContainerID) String() string {
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return fmt.Sprintf("%s://%s", c.Type, c.ID)
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}
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func (c *ContainerID) IsEmpty() bool {
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return *c == ContainerID{}
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}
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func (c *ContainerID) MarshalJSON() ([]byte, error) {
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return []byte(fmt.Sprintf("%q", c.String())), nil
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}
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func (c *ContainerID) UnmarshalJSON(data []byte) error {
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return c.ParseString(string(data))
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}
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// DockerID is an ID of docker container. It is a type to make it clear when we're working with docker container Ids
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type DockerID string
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func (id DockerID) ContainerID() ContainerID {
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return ContainerID{
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Type: "docker",
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ID: string(id),
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}
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}
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type ContainerState string
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const (
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ContainerStateCreated ContainerState = "created"
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ContainerStateRunning ContainerState = "running"
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ContainerStateExited ContainerState = "exited"
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// This unknown encompasses all the states that we currently don't care.
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ContainerStateUnknown ContainerState = "unknown"
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)
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// Container provides the runtime information for a container, such as ID, hash,
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// state of the container.
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type Container struct {
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// The ID of the container, used by the container runtime to identify
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// a container.
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ID ContainerID
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// The name of the container, which should be the same as specified by
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// v1.Container.
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Name string
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// The image name of the container, this also includes the tag of the image,
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// the expected form is "NAME:TAG".
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Image string
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// The id of the image used by the container.
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ImageID string
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// Hash of the container, used for comparison. Optional for containers
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// not managed by kubelet.
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Hash uint64
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// State is the state of the container.
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State ContainerState
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}
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// PodStatus represents the status of the pod and its containers.
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// v1.PodStatus can be derived from examining PodStatus and v1.Pod.
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type PodStatus struct {
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// ID of the pod.
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ID types.UID
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// Name of the pod.
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Name string
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// Namespace of the pod.
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Namespace string
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// All IPs assigned to this pod
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IPs []string
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// Status of containers in the pod.
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ContainerStatuses []*ContainerStatus
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// Status of the pod sandbox.
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// Only for kuberuntime now, other runtime may keep it nil.
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SandboxStatuses []*runtimeapi.PodSandboxStatus
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}
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// ContainerStatus represents the status of a container.
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type ContainerStatus struct {
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// ID of the container.
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ID ContainerID
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// Name of the container.
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Name string
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// Status of the container.
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State ContainerState
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// Creation time of the container.
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CreatedAt time.Time
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// Start time of the container.
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StartedAt time.Time
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// Finish time of the container.
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FinishedAt time.Time
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// Exit code of the container.
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ExitCode int
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// Name of the image, this also includes the tag of the image,
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// the expected form is "NAME:TAG".
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Image string
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// ID of the image.
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ImageID string
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// Hash of the container, used for comparison.
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Hash uint64
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// Number of times that the container has been restarted.
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RestartCount int
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// A string explains why container is in such a status.
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Reason string
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// Message written by the container before exiting (stored in
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// TerminationMessagePath).
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Message string
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}
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// FindContainerStatusByName returns container status in the pod status with the given name.
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// When there are multiple containers' statuses with the same name, the first match will be returned.
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func (podStatus *PodStatus) FindContainerStatusByName(containerName string) *ContainerStatus {
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for _, containerStatus := range podStatus.ContainerStatuses {
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if containerStatus.Name == containerName {
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return containerStatus
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}
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}
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return nil
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}
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// Get container status of all the running containers in a pod
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func (podStatus *PodStatus) GetRunningContainerStatuses() []*ContainerStatus {
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runningContainerStatuses := []*ContainerStatus{}
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for _, containerStatus := range podStatus.ContainerStatuses {
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if containerStatus.State == ContainerStateRunning {
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runningContainerStatuses = append(runningContainerStatuses, containerStatus)
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}
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}
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return runningContainerStatuses
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}
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// Basic information about a container image.
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type Image struct {
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// ID of the image.
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ID string
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// Other names by which this image is known.
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RepoTags []string
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// Digests by which this image is known.
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RepoDigests []string
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// The size of the image in bytes.
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Size int64
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}
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type EnvVar struct {
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Name string
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Value string
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}
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type Annotation struct {
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Name string
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Value string
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}
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type Mount struct {
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// Name of the volume mount.
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// TODO(yifan): Remove this field, as this is not representing the unique name of the mount,
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// but the volume name only.
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Name string
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// Path of the mount within the container.
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ContainerPath string
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// Path of the mount on the host.
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HostPath string
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// Whether the mount is read-only.
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ReadOnly bool
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// Whether the mount needs SELinux relabeling
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SELinuxRelabel bool
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// Requested propagation mode
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Propagation runtimeapi.MountPropagation
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}
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type PortMapping struct {
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// Name of the port mapping
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Name string
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// Protocol of the port mapping.
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Protocol v1.Protocol
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// The port number within the container.
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ContainerPort int
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// The port number on the host.
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HostPort int
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// The host IP.
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HostIP string
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}
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type DeviceInfo struct {
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// Path on host for mapping
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PathOnHost string
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// Path in Container to map
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PathInContainer string
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// Cgroup permissions
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Permissions string
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}
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// RunContainerOptions specify the options which are necessary for running containers
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type RunContainerOptions struct {
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// The environment variables list.
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Envs []EnvVar
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// The mounts for the containers.
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Mounts []Mount
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// The host devices mapped into the containers.
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Devices []DeviceInfo
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// The port mappings for the containers.
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PortMappings []PortMapping
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// The annotations for the container
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// These annotations are generated by other components (i.e.,
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// not users). Currently, only device plugins populate the annotations.
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Annotations []Annotation
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// If the container has specified the TerminationMessagePath, then
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// this directory will be used to create and mount the log file to
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// container.TerminationMessagePath
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PodContainerDir string
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// The type of container rootfs
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ReadOnly bool
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// hostname for pod containers
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Hostname string
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// EnableHostUserNamespace sets userns=host when users request host namespaces (pid, ipc, net),
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// are using non-namespaced capabilities (mknod, sys_time, sys_module), the pod contains a privileged container,
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// or using host path volumes.
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// This should only be enabled when the container runtime is performing user remapping AND if the
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// experimental behavior is desired.
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EnableHostUserNamespace bool
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}
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// VolumeInfo contains information about the volume.
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type VolumeInfo struct {
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// Mounter is the volume's mounter
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Mounter volume.Mounter
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// BlockVolumeMapper is the Block volume's mapper
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BlockVolumeMapper volume.BlockVolumeMapper
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// SELinuxLabeled indicates whether this volume has had the
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// pod's SELinux label applied to it or not
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SELinuxLabeled bool
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// Whether the volume permission is set to read-only or not
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// This value is passed from volume.spec
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ReadOnly bool
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// Inner volume spec name, which is the PV name if used, otherwise
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// it is the same as the outer volume spec name.
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InnerVolumeSpecName string
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}
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type VolumeMap map[string]VolumeInfo
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// RuntimeConditionType is the types of required runtime conditions.
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type RuntimeConditionType string
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const (
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// RuntimeReady means the runtime is up and ready to accept basic containers.
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RuntimeReady RuntimeConditionType = "RuntimeReady"
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// NetworkReady means the runtime network is up and ready to accept containers which require network.
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NetworkReady RuntimeConditionType = "NetworkReady"
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)
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// RuntimeStatus contains the status of the runtime.
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type RuntimeStatus struct {
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// Conditions is an array of current observed runtime conditions.
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Conditions []RuntimeCondition
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}
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// GetRuntimeCondition gets a specified runtime condition from the runtime status.
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func (r *RuntimeStatus) GetRuntimeCondition(t RuntimeConditionType) *RuntimeCondition {
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for i := range r.Conditions {
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c := &r.Conditions[i]
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if c.Type == t {
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return c
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}
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}
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return nil
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}
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// String formats the runtime status into human readable string.
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func (s *RuntimeStatus) String() string {
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var ss []string
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for _, c := range s.Conditions {
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ss = append(ss, c.String())
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}
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return fmt.Sprintf("Runtime Conditions: %s", strings.Join(ss, ", "))
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}
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// RuntimeCondition contains condition information for the runtime.
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type RuntimeCondition struct {
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// Type of runtime condition.
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Type RuntimeConditionType
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// Status of the condition, one of true/false.
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Status bool
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// Reason is brief reason for the condition's last transition.
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Reason string
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// Message is human readable message indicating details about last transition.
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Message string
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}
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// String formats the runtime condition into human readable string.
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func (c *RuntimeCondition) String() string {
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return fmt.Sprintf("%s=%t reason:%s message:%s", c.Type, c.Status, c.Reason, c.Message)
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}
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type Pods []*Pod
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// FindPodByID finds and returns a pod in the pod list by UID. It will return an empty pod
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// if not found.
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|
func (p Pods) FindPodByID(podUID types.UID) Pod {
|
|
for i := range p {
|
|
if p[i].ID == podUID {
|
|
return *p[i]
|
|
}
|
|
}
|
|
return Pod{}
|
|
}
|
|
|
|
// FindPodByFullName finds and returns a pod in the pod list by the full name.
|
|
// It will return an empty pod if not found.
|
|
func (p Pods) FindPodByFullName(podFullName string) Pod {
|
|
for i := range p {
|
|
if BuildPodFullName(p[i].Name, p[i].Namespace) == podFullName {
|
|
return *p[i]
|
|
}
|
|
}
|
|
return Pod{}
|
|
}
|
|
|
|
// FindPod combines FindPodByID and FindPodByFullName, it finds and returns a pod in the
|
|
// pod list either by the full name or the pod ID. It will return an empty pod
|
|
// if not found.
|
|
func (p Pods) FindPod(podFullName string, podUID types.UID) Pod {
|
|
if len(podFullName) > 0 {
|
|
return p.FindPodByFullName(podFullName)
|
|
}
|
|
return p.FindPodByID(podUID)
|
|
}
|
|
|
|
// FindContainerByName returns a container in the pod with the given name.
|
|
// When there are multiple containers with the same name, the first match will
|
|
// be returned.
|
|
func (p *Pod) FindContainerByName(containerName string) *Container {
|
|
for _, c := range p.Containers {
|
|
if c.Name == containerName {
|
|
return c
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (p *Pod) FindContainerByID(id ContainerID) *Container {
|
|
for _, c := range p.Containers {
|
|
if c.ID == id {
|
|
return c
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (p *Pod) FindSandboxByID(id ContainerID) *Container {
|
|
for _, c := range p.Sandboxes {
|
|
if c.ID == id {
|
|
return c
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// ToAPIPod converts Pod to v1.Pod. Note that if a field in v1.Pod has no
|
|
// corresponding field in Pod, the field would not be populated.
|
|
func (p *Pod) ToAPIPod() *v1.Pod {
|
|
var pod v1.Pod
|
|
pod.UID = p.ID
|
|
pod.Name = p.Name
|
|
pod.Namespace = p.Namespace
|
|
|
|
for _, c := range p.Containers {
|
|
var container v1.Container
|
|
container.Name = c.Name
|
|
container.Image = c.Image
|
|
pod.Spec.Containers = append(pod.Spec.Containers, container)
|
|
}
|
|
return &pod
|
|
}
|
|
|
|
// IsEmpty returns true if the pod is empty.
|
|
func (p *Pod) IsEmpty() bool {
|
|
return reflect.DeepEqual(p, &Pod{})
|
|
}
|
|
|
|
// GetPodFullName returns a name that uniquely identifies a pod.
|
|
func GetPodFullName(pod *v1.Pod) string {
|
|
// Use underscore as the delimiter because it is not allowed in pod name
|
|
// (DNS subdomain format), while allowed in the container name format.
|
|
return pod.Name + "_" + pod.Namespace
|
|
}
|
|
|
|
// Build the pod full name from pod name and namespace.
|
|
func BuildPodFullName(name, namespace string) string {
|
|
return name + "_" + namespace
|
|
}
|
|
|
|
// Parse the pod full name.
|
|
func ParsePodFullName(podFullName string) (string, string, error) {
|
|
parts := strings.Split(podFullName, "_")
|
|
if len(parts) != 2 || parts[0] == "" || parts[1] == "" {
|
|
return "", "", fmt.Errorf("failed to parse the pod full name %q", podFullName)
|
|
}
|
|
return parts[0], parts[1], nil
|
|
}
|
|
|
|
// Option is a functional option type for Runtime, useful for
|
|
// completely optional settings.
|
|
type Option func(Runtime)
|
|
|
|
// Sort the container statuses by creation time.
|
|
type SortContainerStatusesByCreationTime []*ContainerStatus
|
|
|
|
func (s SortContainerStatusesByCreationTime) Len() int { return len(s) }
|
|
func (s SortContainerStatusesByCreationTime) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
|
|
func (s SortContainerStatusesByCreationTime) Less(i, j int) bool {
|
|
return s[i].CreatedAt.Before(s[j].CreatedAt)
|
|
}
|
|
|
|
const (
|
|
// MaxPodTerminationMessageLogLength is the maximum bytes any one pod may have written
|
|
// as termination message output across all containers. Containers will be evenly truncated
|
|
// until output is below this limit.
|
|
MaxPodTerminationMessageLogLength = 1024 * 12
|
|
// MaxContainerTerminationMessageLength is the upper bound any one container may write to
|
|
// its termination message path. Contents above this length will be truncated.
|
|
MaxContainerTerminationMessageLength = 1024 * 4
|
|
// MaxContainerTerminationMessageLogLength is the maximum bytes any one container will
|
|
// have written to its termination message when the message is read from the logs.
|
|
MaxContainerTerminationMessageLogLength = 1024 * 2
|
|
// MaxContainerTerminationMessageLogLines is the maximum number of previous lines of
|
|
// log output that the termination message can contain.
|
|
MaxContainerTerminationMessageLogLines = 80
|
|
)
|