func setupCGroups(partitions map[string]int64) error {
subsystems, err := cgroups.GetAllSubsystems()
if err != nil {
return fmt.Errorf("error getting cgroup subsystems: %s", err)
} else if len(subsystems) == 0 {
return fmt.Errorf("failed to detect any cgroup subsystems")
}
for _, subsystem := range subsystems {
if _, err := cgroups.FindCgroupMountpoint(subsystem); err == nil {
// subsystem already mounted
continue
}
path := filepath.Join(cgroupRoot, subsystem)
if err := os.Mkdir(path, 0755); err != nil && !os.IsExist(err) {
return fmt.Errorf("error creating %s cgroup directory: %s", subsystem, err)
}
if err := syscall.Mount("cgroup", path, "cgroup", 0, subsystem); err != nil {
return fmt.Errorf("error mounting %s cgroup: %s", subsystem, err)
}
}
for name, shares := range partitions {
if err := createCGroupPartition(name, shares); err != nil {
return err
}
}
return nil
}
// Return an map of susbystem -> absolute container cgroup path
func cgroupPaths(containerID string) (map[string]string, error) {
subsystems, err := cgroups.GetAllSubsystems()
if err != nil {
return nil, err
}
logrus.Debugf("subsystems: %s", subsystems)
paths := make(map[string]string)
for _, subsystem := range subsystems {
cgroupRoot, cgroupDir, err := findCgroupRootAndDir(subsystem)
logrus.Debugf("cgroup path %s %s", cgroupRoot, cgroupDir)
if err != nil {
//unsupported subystem
continue
}
// if we are running dind
dockerPathIdx := strings.LastIndex(cgroupDir, "docker")
if dockerPathIdx != -1 {
cgroupDir = cgroupDir[:dockerPathIdx-1]
}
path := filepath.Join(cgroupRoot, cgroupDir, "lxc", containerID)
paths[subsystem] = path
}
return paths, nil
}
// Return an map of susbystem -> absolute container cgroup path
func cgroupPaths(containerID string) (map[string]string, error) {
subsystems, err := cgroups.GetAllSubsystems()
if err != nil {
return nil, err
}
logrus.Debugf("subsystems: %s", subsystems)
paths := make(map[string]string)
for _, subsystem := range subsystems {
cgroupRoot, cgroupDir, err := findCgroupRootAndDir(subsystem)
logrus.Debugf("cgroup path %s %s", cgroupRoot, cgroupDir)
if err != nil {
//unsupported subystem
continue
}
path := filepath.Join(cgroupRoot, cgroupDir, "lxc", containerID)
paths[subsystem] = path
}
return paths, nil
}