Docker Swarm代码分析笔记(10)——Cluster.validatePendingEngine

肖楠 · · 657 次点击 · · 开始浏览    
这是一个创建于 的文章,其中的信息可能已经有所发展或是发生改变。

Cluster.validatePendingEngine是实际上用来连接Docker engine的代码:

// validatePendingEngine connects to the engine,
func (c *Cluster) validatePendingEngine(engine *cluster.Engine) bool {
    // Attempt a connection to the engine. Since this is slow, don't get a hold
    // of the lock yet.
    if err := engine.Connect(c.TLSConfig); err != nil {
        log.WithFields(log.Fields{"Addr": engine.Addr}).Debugf("Failed to validate pending node: %s", err)
        return false
    }

    // The following is critical and fast. Grab a lock.
    c.Lock()
    defer c.Unlock()

    // Only validate engines from pendingEngines list
    if _, exists := c.pendingEngines[engine.Addr]; !exists {
        return false
    }

    // Make sure the engine ID is unique.
    if old, exists := c.engines[engine.ID]; exists {
        if old.Addr != engine.Addr {
            log.Errorf("ID duplicated. %s shared by %s and %s", engine.ID, old.Addr, engine.Addr)
            // Keep this engine in pendingEngines table and show its error.
            // If it's ID duplication from VM clone, user see this message and can fix it.
            // If the engine is rebooted and get new IP from DHCP, previous address will be removed
            // from discovery after a while.
            // In both cases, retry may fix the problem.
            engine.HandleIDConflict(old.Addr)
        } else {
            log.Debugf("node %q (name: %q) with address %q is already registered", engine.ID, engine.Name, engine.Addr)
            engine.Disconnect()
            // Remove it from pendingEngines table
            delete(c.pendingEngines, engine.Addr)
        }
        return false
    }

    // Engine validated, move from pendingEngines table to engines table
    delete(c.pendingEngines, engine.Addr)
    // set engine state to healthy, and start refresh loop
    engine.ValidationComplete()
    c.engines[engine.ID] = engine

    log.Infof("Registered Engine %s at %s", engine.Name, engine.Addr)
    return true
}

Cluster.validatePendingEngine永远操作Cluster.pendingEngines里的Engine,如果连接Docker engine成功,就会把这个Engine移到Cluster.engines这个map里。

 


有疑问加站长微信联系(非本文作者)

本文来自:nanxiao

感谢作者:肖楠

查看原文:Docker Swarm代码分析笔记(10)——Cluster.validatePendingEngine

入群交流(和以上内容无关):加入Go大咖交流群,或添加微信:liuxiaoyan-s 备注:入群;或加QQ群:692541889

657 次点击  
加入收藏 微博
暂无回复
添加一条新回复 (您需要 登录 后才能回复 没有账号 ?)
  • 请尽量让自己的回复能够对别人有帮助
  • 支持 Markdown 格式, **粗体**、~~删除线~~、`单行代码`
  • 支持 @ 本站用户;支持表情(输入 : 提示),见 Emoji cheat sheet
  • 图片支持拖拽、截图粘贴等方式上传