128 lines
4.7 KiB
Go
128 lines
4.7 KiB
Go
/*
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Copyright 2017 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 server
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import (
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"fmt"
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"github.com/containerd/containerd/api/services/containers"
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"github.com/containerd/containerd/snapshot"
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"github.com/golang/glog"
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"golang.org/x/net/context"
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runtime "k8s.io/kubernetes/pkg/kubelet/apis/cri/v1alpha1"
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"github.com/kubernetes-incubator/cri-containerd/pkg/metadata"
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)
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// RemoveContainer removes the container.
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func (c *criContainerdService) RemoveContainer(ctx context.Context, r *runtime.RemoveContainerRequest) (retRes *runtime.RemoveContainerResponse, retErr error) {
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glog.V(2).Infof("RemoveContainer for %q", r.GetContainerId())
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defer func() {
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if retErr == nil {
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glog.V(2).Infof("RemoveContainer %q returns successfully", r.GetContainerId())
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}
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}()
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id := r.GetContainerId()
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// Set removing state to prevent other start/remove operations against this container
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// while it's being removed.
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if err := c.setContainerRemoving(id); err != nil {
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if !metadata.IsNotExistError(err) {
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return nil, fmt.Errorf("failed to set removing state for container %q: %v",
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id, err)
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}
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// Do not return error if container metadata doesn't exist.
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glog.V(5).Infof("RemoveContainer called for container %q that does not exist", id)
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return &runtime.RemoveContainerResponse{}, nil
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}
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defer func() {
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if retErr == nil {
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// Cleanup all index after successfully remove the container.
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c.containerNameIndex.ReleaseByKey(id)
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return
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}
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// Reset removing if remove failed.
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if err := c.resetContainerRemoving(id); err != nil {
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// TODO(random-liu): Deal with update failure. Actually Removing doesn't need to
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// be checkpointed, we only need it to have the same lifecycle with container metadata.
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glog.Errorf("failed to reset removing state for container %q: %v",
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id, err)
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}
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}()
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// NOTE(random-liu): Docker set container to "Dead" state when start removing the
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// container so as to avoid start/restart the container again. However, for current
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// kubelet implementation, we'll never start a container once we decide to remove it,
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// so we don't need the "Dead" state for now.
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// Remove container snapshot.
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if err := c.snapshotService.Remove(ctx, id); err != nil {
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if !snapshot.IsNotExist(err) {
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return nil, fmt.Errorf("failed to remove container snapshot %q: %v", id, err)
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}
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glog.V(5).Infof("Remove called for snapshot %q that does not exist", id)
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}
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// Cleanup container root directory.
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containerRootDir := getContainerRootDir(c.rootDir, id)
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if err := c.os.RemoveAll(containerRootDir); err != nil {
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return nil, fmt.Errorf("failed to remove container root directory %q: %v",
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containerRootDir, err)
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}
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// Delete containerd container.
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if _, err := c.containerService.Delete(ctx, &containers.DeleteContainerRequest{ID: id}); err != nil {
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if !isContainerdGRPCNotFoundError(err) {
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return nil, fmt.Errorf("failed to delete containerd container %q: %v", id, err)
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}
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glog.V(5).Infof("Remove called for containerd container %q that does not exist", id, err)
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}
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// Delete container metadata.
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if err := c.containerStore.Delete(id); err != nil {
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return nil, fmt.Errorf("failed to delete container metadata for %q: %v", id, err)
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}
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return &runtime.RemoveContainerResponse{}, nil
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}
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// setContainerRemoving sets the container into removing state. In removing state, the
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// container will not be started or removed again.
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func (c *criContainerdService) setContainerRemoving(id string) error {
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return c.containerStore.Update(id, func(meta metadata.ContainerMetadata) (metadata.ContainerMetadata, error) {
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// Do not remove container if it's still running.
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if meta.State() == runtime.ContainerState_CONTAINER_RUNNING {
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return meta, fmt.Errorf("container %q is still running", id)
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}
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if meta.Removing {
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return meta, fmt.Errorf("container is already in removing state")
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}
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meta.Removing = true
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return meta, nil
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})
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}
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// resetContainerRemoving resets the container removing state on remove failure. So
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// that we could remove the container again.
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func (c *criContainerdService) resetContainerRemoving(id string) error {
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return c.containerStore.Update(id, func(meta metadata.ContainerMetadata) (metadata.ContainerMetadata, error) {
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meta.Removing = false
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return meta, nil
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})
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}
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