Example #1
0
func (kl *Kubelet) syncPod(pod *Pod, dockerContainers DockerContainers) error {
	podFullName := GetPodFullName(pod)
	containersToKeep := make(map[DockerID]empty)
	killedContainers := make(map[DockerID]empty)

	// Make sure we have a network container
	var netID DockerID
	if networkDockerContainer, found, _ := dockerContainers.FindPodContainer(podFullName, networkContainerName); found {
		netID = DockerID(networkDockerContainer.ID)
	} else {
		glog.Infof("Network container doesn't exist, creating")
		count, err := kl.deleteAllContainers(pod, podFullName, dockerContainers)
		if err != nil {
			return err
		}
		dockerNetworkID, err := kl.createNetworkContainer(pod)
		if err != nil {
			glog.Errorf("Failed to introspect network container. (%v)  Skipping pod %s", err, podFullName)
			return err
		}
		netID = dockerNetworkID
		if count > 0 {
			// relist everything, otherwise we'll think we're ok
			dockerContainers, err = getKubeletDockerContainers(kl.dockerClient)
			if err != nil {
				glog.Errorf("Error listing containers %#v", dockerContainers)
				return err
			}
		}
	}
	containersToKeep[netID] = empty{}

	podVolumes, err := kl.mountExternalVolumes(&pod.Manifest)
	if err != nil {
		glog.Errorf("Unable to mount volumes for pod %s: (%v) Skipping pod.", podFullName, err)
		return err
	}

	podState := api.PodState{}
	info, err := kl.GetPodInfo(podFullName)
	if err != nil {
		glog.Errorf("Unable to get pod info, health checks may be invalid.")
	}
	netInfo, found := info[networkContainerName]
	if found && netInfo.NetworkSettings != nil {
		podState.PodIP = netInfo.NetworkSettings.IPAddress
	}

	for _, container := range pod.Manifest.Containers {
		expectedHash := hashContainer(&container)
		if dockerContainer, found, hash := dockerContainers.FindPodContainer(podFullName, container.Name); found {
			containerID := DockerID(dockerContainer.ID)
			glog.Infof("pod %s container %s exists as %v", podFullName, container.Name, containerID)
			glog.V(1).Infof("pod %s container %s exists as %v", podFullName, container.Name, containerID)

			// look for changes in the container.
			if hash == 0 || hash == expectedHash {
				// TODO: This should probably be separated out into a separate goroutine.
				healthy, err := kl.healthy(podFullName, podState, container, dockerContainer)
				if err != nil {
					glog.V(1).Infof("health check errored: %v", err)
					containersToKeep[containerID] = empty{}
					continue
				}
				if healthy == health.Healthy {
					containersToKeep[containerID] = empty{}
					continue
				}
				glog.V(1).Infof("pod %s container %s is unhealthy.", podFullName, container.Name, healthy)
			} else {
				glog.V(1).Infof("container hash changed %d vs %d.", hash, expectedHash)
			}
			if err := kl.killContainer(dockerContainer); err != nil {
				glog.V(1).Infof("Failed to kill container %s: %v", dockerContainer.ID, err)
				continue
			}
			killedContainers[containerID] = empty{}
		}

		glog.Infof("Container doesn't exist, creating %#v", container)
		if err := kl.dockerPuller.Pull(container.Image); err != nil {
			glog.Errorf("Failed to pull image: %v skipping pod %s container %s.", err, podFullName, container.Name)
			continue
		}
		containerID, err := kl.runContainer(pod, &container, podVolumes, "container:"+string(netID))
		if err != nil {
			// TODO(bburns) : Perhaps blacklist a container after N failures?
			glog.Errorf("Error running pod %s container %s: %v", podFullName, container.Name, err)
			continue
		}
		containersToKeep[containerID] = empty{}
	}

	// Kill any containers in this pod which were not identified above (guards against duplicates).
	for id, container := range dockerContainers {
		curPodFullName, _, _ := parseDockerName(container.Names[0])
		if curPodFullName == podFullName {
			// Don't kill containers we want to keep or those we already killed.
			_, keep := containersToKeep[id]
			_, killed := killedContainers[id]
			if !keep && !killed {
				err = kl.killContainer(container)
				if err != nil {
					glog.Errorf("Error killing container: %v", err)
				}
			}
		}
	}

	return nil
}
Example #2
0
func (kl *Kubelet) syncPod(pod *Pod, dockerContainers dockertools.DockerContainers) error {
	podFullName := GetPodFullName(pod)
	uuid := pod.Manifest.UUID
	containersToKeep := make(map[dockertools.DockerID]empty)
	killedContainers := make(map[dockertools.DockerID]empty)

	// Make sure we have a network container
	var netID dockertools.DockerID
	if networkDockerContainer, found, _ := dockerContainers.FindPodContainer(podFullName, uuid, networkContainerName); found {
		netID = dockertools.DockerID(networkDockerContainer.ID)
	} else {
		glog.Infof("Network container doesn't exist, creating")
		count, err := kl.deleteAllContainers(pod, podFullName, dockerContainers)
		if err != nil {
			return err
		}
		dockerNetworkID, err := kl.createNetworkContainer(pod)
		if err != nil {
			glog.Errorf("Failed to introspect network container. (%v)  Skipping pod %s", err, podFullName)
			return err
		}
		netID = dockerNetworkID
		if count > 0 {
			// relist everything, otherwise we'll think we're ok
			dockerContainers, err = dockertools.GetKubeletDockerContainers(kl.dockerClient)
			if err != nil {
				glog.Errorf("Error listing containers %#v", dockerContainers)
				return err
			}
		}
	}
	containersToKeep[netID] = empty{}

	podVolumes, err := kl.mountExternalVolumes(&pod.Manifest)
	if err != nil {
		glog.Errorf("Unable to mount volumes for pod %s: (%v) Skipping pod.", podFullName, err)
		return err
	}

	podState := api.PodState{Manifest: api.ContainerManifest{UUID: uuid}}
	info, err := kl.GetPodInfo(podFullName, uuid)
	if err != nil {
		glog.Errorf("Unable to get pod with name %s and uuid %s info, health checks may be invalid.",
			podFullName, uuid)
	}
	netInfo, found := info[networkContainerName]
	if found && netInfo.NetworkSettings != nil {
		podState.PodIP = netInfo.NetworkSettings.IPAddress
	}

	for _, container := range pod.Manifest.Containers {
		expectedHash := dockertools.HashContainer(&container)
		if dockerContainer, found, hash := dockerContainers.FindPodContainer(podFullName, uuid, container.Name); found {
			containerID := dockertools.DockerID(dockerContainer.ID)
			glog.V(1).Infof("pod %s container %s exists as %v", podFullName, container.Name, containerID)

			// look for changes in the container.
			if hash == 0 || hash == expectedHash {
				// TODO: This should probably be separated out into a separate goroutine.
				healthy, err := kl.healthy(podFullName, podState, container, dockerContainer)
				if err != nil {
					glog.V(1).Infof("health check errored: %v", err)
					containersToKeep[containerID] = empty{}
					continue
				}
				if healthy == health.Healthy {
					containersToKeep[containerID] = empty{}
					continue
				}
				glog.V(1).Infof("pod %s container %s is unhealthy.", podFullName, container.Name, healthy)
			} else {
				glog.V(1).Infof("container hash changed %d vs %d.", hash, expectedHash)
			}
			if err := kl.killContainer(dockerContainer); err != nil {
				glog.V(1).Infof("Failed to kill container %s: %v", dockerContainer.ID, err)
				continue
			}
			killedContainers[containerID] = empty{}
		}

		// Check RestartPolicy for container
		recentContainers, err := dockertools.GetRecentDockerContainersWithNameAndUUID(kl.dockerClient, podFullName, uuid, container.Name)
		if err != nil {
			glog.Errorf("Error listing recent containers with name and uuid:%s--%s--%s", podFullName, uuid, container.Name)
			// TODO(dawnchen): error handling here?
		}

		if len(recentContainers) > 0 && pod.Manifest.RestartPolicy.Always == nil {
			if pod.Manifest.RestartPolicy.Never != nil {
				glog.Infof("Already ran container with name %s--%s--%s, do nothing",
					podFullName, uuid, container.Name)
				continue
			}
			if pod.Manifest.RestartPolicy.OnFailure != nil {
				// Check the exit code of last run
				if recentContainers[0].State.ExitCode == 0 {
					glog.Infof("Already successfully ran container with name %s--%s--%s, do nothing",
						podFullName, uuid, container.Name)
					continue
				}
			}
		}

		glog.Infof("Container with name %s--%s--%s doesn't exist, creating %#v", podFullName, uuid, container.Name, container)
		if err := kl.dockerPuller.Pull(container.Image); err != nil {
			glog.Errorf("Failed to pull image %s: %v skipping pod %s container %s.", container.Image, err, podFullName, container.Name)
			continue
		}
		// TODO(dawnchen): Check RestartPolicy.DelaySeconds before restart a container
		containerID, err := kl.runContainer(pod, &container, podVolumes, "container:"+string(netID))
		if err != nil {
			// TODO(bburns) : Perhaps blacklist a container after N failures?
			glog.Errorf("Error running pod %s container %s: %v", podFullName, container.Name, err)
			continue
		}
		containersToKeep[containerID] = empty{}
	}

	// Kill any containers in this pod which were not identified above (guards against duplicates).
	for id, container := range dockerContainers {
		curPodFullName, curUUID, _, _ := dockertools.ParseDockerName(container.Names[0])
		if curPodFullName == podFullName && curUUID == uuid {
			// Don't kill containers we want to keep or those we already killed.
			_, keep := containersToKeep[id]
			_, killed := killedContainers[id]
			if !keep && !killed {
				err = kl.killContainer(container)
				if err != nil {
					glog.Errorf("Error killing container: %v", err)
				}
			}
		}
	}

	return nil
}