// Helper for getting the docker version.
func getDockerVersion(cadvisor cadvisor.Interface) *utilversion.Version {
	versions, err := cadvisor.VersionInfo()
	if err != nil {
		glog.Errorf("Error requesting cAdvisor VersionInfo: %v", err)
		return utilversion.MustParseSemantic("0.0.0")
	}
	dockerVersion, err := utilversion.ParseSemantic(versions.DockerVersion)
	if err != nil {
		glog.Errorf("Error parsing docker version %q: %v", versions.DockerVersion, err)
		return utilversion.MustParseSemantic("0.0.0")
	}
	return dockerVersion
}
Exemplo n.º 2
0
// Helper for getting the docker version.
func getDockerVersion(cadvisor cadvisor.Interface) semver.Version {
	var fallback semver.Version // Fallback to zero-value by default.
	versions, err := cadvisor.VersionInfo()
	if err != nil {
		glog.Errorf("Error requesting cAdvisor VersionInfo: %v", err)
		return fallback
	}
	dockerVersion, err := semver.Parse(versions.DockerVersion)
	if err != nil {
		glog.Errorf("Error parsing docker version %q: %v", versions.DockerVersion, err)
		return fallback
	}
	return dockerVersion
}
// TODO(vmarmol): Add limits to the system containers.
// Takes the absolute name of the specified containers.
// Empty container name disables use of the specified container.
func newContainerManager(cadvisorInterface cadvisor.Interface, dockerDaemonContainerName, systemContainerName, kubeletContainerName string) (containerManager, error) {
	systemContainers := []*systemContainer{}

	if dockerDaemonContainerName != "" {
		cont := newSystemContainer(dockerDaemonContainerName)

		info, err := cadvisorInterface.MachineInfo()
		var capacity = api.ResourceList{}
		if err != nil {
		} else {
			capacity = CapacityFromMachineInfo(info)
		}
		memoryLimit := (int64(capacity.Memory().Value() * DockerMemoryLimitThresholdPercent / 100))
		if memoryLimit < MinDockerMemoryLimit {
			glog.Warningf("Memory limit %d for container %s is too small, reset it to %d", memoryLimit, dockerDaemonContainerName, MinDockerMemoryLimit)
			memoryLimit = MinDockerMemoryLimit
		}

		glog.V(2).Infof("Configure resource-only container %s with memory limit: %d", dockerDaemonContainerName, memoryLimit)

		dockerContainer := &fs.Manager{
			Cgroups: &configs.Cgroup{
				Name:            dockerDaemonContainerName,
				Memory:          memoryLimit,
				MemorySwap:      -1,
				AllowAllDevices: true,
			},
		}
		cont.ensureStateFunc = func(manager *fs.Manager) error {
			return ensureDockerInContainer(cadvisorInterface, -900, dockerContainer)
		}
		systemContainers = append(systemContainers, cont)
	}

	if systemContainerName != "" {
		if systemContainerName == "/" {
			return nil, fmt.Errorf("system container cannot be root (\"/\")")
		}

		rootContainer := &fs.Manager{
			Cgroups: &configs.Cgroup{
				Name: "/",
			},
		}
		manager := createManager(systemContainerName)

		err := ensureSystemContainer(rootContainer, manager)
		if err != nil {
			return nil, err
		}
		systemContainers = append(systemContainers, newSystemContainer(systemContainerName))
	}

	if kubeletContainerName != "" {
		systemContainers = append(systemContainers, newSystemContainer(kubeletContainerName))
	}

	// TODO(vmarmol): Add Kube-proxy container.

	return &containerManagerImpl{
		systemContainers: systemContainers,
	}, nil
}