Docker容器ID的生成方式

我想知道容器ID的生成方式,因此请提供执行docker run时提供容器ID的源代码?

回答:

这是docker守护程序创建容器的代码片段:

func (daemon *Daemon) newContainer(name string, config *runconfig.Config, imgID string) (*Container, error) {

var (

id string

err error

)

id, name, err = daemon.generateIDAndName(name)

if err != nil {

return nil, err

}

base := daemon.newBaseContainer(id)

base.ExecDriver = daemon.execDriver.Name()

return &base, err

}

因此,创建ID和名称的逻辑是在generateIDAndName函数中:

func (daemon *Daemon) generateIDAndName(name string) (string, string, error) {

var (

err error

id = stringid.GenerateNonCryptoID()

)

if name == "" {

if name, err = daemon.generateNewName(id); err != nil {

return "", "", err

}

return id, name, nil

}

if name, err = daemon.reserveName(id, name); err != nil {

return "", "", err

}

return id, name, nil

}

这是字符串源,具体方法是使用false作为输入参数的generateID:

func generateID(crypto bool) string {

b := make([]byte, 32)

var r io.Reader = random.Reader

if crypto {

r = rand.Reader

}

for {

if _, err := io.ReadFull(r, b); err != nil {

panic(err) // This shouldn't happen

}

id := hex.EncodeToString(b)

// if we try to parse the truncated for as an int and we don't have

// an error then the value is all numberic and causes issues when

// used as a hostname. ref #3869

if _, err := strconv.ParseInt(TruncateID(id), 10, 64); err == nil {

continue

}

return id

}

}

正如你所看到的,该值是随机与此产生的随机

// Reader is a global, shared instance of a pseudorandom bytes generator.

// It doesn't consume entropy.

var Reader io.Reader = &reader{rnd: Rand}

以上是 Docker容器ID的生成方式 的全部内容, 来源链接: utcz.com/qa/431166.html

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