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update.go
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update.go
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package plugin
import (
"fmt"
"strings"
"github.com/golang/glog"
dockertypes "github.com/docker/engine-api/types"
kapi "k8s.io/kubernetes/pkg/api"
kcontainer "k8s.io/kubernetes/pkg/kubelet/container"
"k8s.io/kubernetes/pkg/kubelet/dockertools"
"k8s.io/kubernetes/pkg/kubelet/leaky"
)
func formatPod(pod *kapi.Pod) string {
return fmt.Sprintf("%s/%s", pod.Namespace, pod.Name)
}
// Copied from pkg/kubelet/dockershim/naming.go::parseSandboxName()
func dockerSandboxNameToInfraPodNamePrefix(name string) (string, error) {
// Docker adds a "/" prefix to names. so trim it.
name = strings.TrimPrefix(name, "/")
parts := strings.Split(name, "_")
// Tolerate the random suffix.
// TODO(random-liu): Remove 7 field case when docker 1.11 is deprecated.
if len(parts) != 6 && len(parts) != 7 {
return "", fmt.Errorf("failed to parse the sandbox name: %q", name)
}
if parts[0] != "k8s" {
return "", fmt.Errorf("container is not managed by kubernetes: %q", name)
}
// Return /k8s_POD_name_namespace_uid
return fmt.Sprintf("/k8s_%s_%s_%s_%s", leaky.PodInfraContainerName, parts[2], parts[3], parts[4]), nil
}
func killInfraContainerForPod(docker dockertools.DockerInterface, containers []dockertypes.Container, cid kcontainer.ContainerID) error {
// FIXME: handle CRI-O; but unfortunately CRI-O supports multiple
// "runtimes" which depend on the filename of that runtime binary,
// so we have no idea what cid.Type will be.
if cid.Type != "docker" {
return fmt.Errorf("unhandled runtime %q", cid.Type)
}
var err error
var infraPrefix string
for _, c := range containers {
if c.ID == cid.ID {
infraPrefix, err = dockerSandboxNameToInfraPodNamePrefix(c.Names[0])
if err != nil {
return err
}
break
}
}
if infraPrefix == "" {
return fmt.Errorf("failed to generate infra container prefix from %q", cid.ID)
}
// Find and kill the infra container
for _, c := range containers {
if strings.HasPrefix(c.Names[0], infraPrefix) {
if err := docker.StopContainer(c.ID, 10); err != nil {
glog.Warningf("failed to stop infra container %q", c.ID)
}
}
}
return nil
}
// This function finds the ContainerID of a failed pod, parses it, and kills
// any matching Infra container for that pod.
func killUpdateFailedPods(docker dockertools.DockerInterface, pods []kapi.Pod) error {
containers, err := docker.ListContainers(dockertypes.ContainerListOptions{All: true})
if err != nil {
return fmt.Errorf("failed to list docker containers: %v", err)
}
for _, pod := range pods {
// Find the first ready container in the pod and use it to find the infra container
var cid kcontainer.ContainerID
for i := range pod.Status.ContainerStatuses {
if pod.Status.ContainerStatuses[i].State.Running != nil && pod.Status.ContainerStatuses[i].ContainerID != "" {
cid = kcontainer.ParseContainerID(pod.Status.ContainerStatuses[i].ContainerID)
break
}
}
if cid.IsEmpty() {
continue
}
glog.V(5).Infof("Killing pod %q sandbox on restart", formatPod(&pod))
if err := killInfraContainerForPod(docker, containers, cid); err != nil {
glog.Warningf("Failed to kill pod %q sandbox: %v", formatPod(&pod), err)
continue
}
}
return nil
}