// 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
}
// 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
}