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Docker 专栏自己动手写 Docker 源码

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gocker's Issues

Cgroups.Apply方法无法生效

Cgroups.Apply方法代码

gocker/cgroups/cgoups.go

Lines 25 to 47 in b01d7f2

func (c *Cgroups) Apply(pid int) error {
if c.CPU != 0 {
cpuCgroupPath, err := getCgroupPath("cpu", true)
if err != nil {
return err
}
err = ioutil.WriteFile(path.Join(cpuCgroupPath, "tasks"), []byte(strconv.Itoa(pid)), 0644)
if err != nil {
return fmt.Errorf("set cgroup cpu fail %v", err)
}
}
if c.Memory != 0 {
memoryCgroupPath, err := getCgroupPath("memory", true)
if err != nil {
return err
}
err = ioutil.WriteFile(path.Join(memoryCgroupPath, "tasks"), []byte(strconv.Itoa(pid)), 0644)
if err != nil {
return fmt.Errorf("set cgroup memory fail %v", err)
}
}
return nil
}

Apply之前未将命令行参数中的cpu和memory设置为对象cgroup的成员变量

gocker/runc/run.go

Lines 76 to 87 in b01d7f2

// use gocker as cgroup name
cgroup := cgroups.NewCgroups()
defer cgroup.Destroy()
cpus := context.Int("cpus")
if cpus != 0 {
cgroup.SetCPULimit(cpus)
}
m := context.Int("m")
if m != 0 {
cgroup.SetMemoryLimit(m)
}
cgroup.Apply(cmd.Process.Pid)

已提PR尝试解决： #1

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