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技术分享的价值
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<p>自工作以来，一直以工程师的角色工作，常常会思考一个问题，如何在技术上获得更多成长？可能很多工程师和我一样也有这样的疑惑。当然这个问题有很多方面可以探讨，今天想跟大家分享一下，技术分享是如何带给我成长的。总结下来，认为分享带给我的成长很多，于我而言，认为技术分享带给我以下四点</p>
<h3 id="目标"><a href="#目标" class="headerlink" title="目标"></a>目标</h3><p>技术分享，当拟定一个主题并且需要去实现这个主题的时候，头脑中肯定会有idea。但是当提笔开始落地的时候，往往会发现很难将idea连贯成为技术文章。比如，Kubernetes存储方面的各种组件，假设A B C三个组件，我也知道A B C大致做了什么，但是真要完成一篇《K8S存储系统概览》来讲清楚Kubernetes存储的时候，为什么需要A B C三个组件协作，A B C三个组件如何协作，会发现对于K8S存储系统的了解其实还有很多欠缺的地方，这个时候你就会回头再来通过代码和各种实现更加深入的了解此技术。</p>
<h3 id="总结归纳"><a href="#总结归纳" class="headerlink" title="总结归纳"></a>总结归纳</h3><p>技术分享的目的，总归是要让别人了解你做的事情，要讲清楚一件事情，之前以为很简单，真正开始做技术分享才发现其实很难，因为你面对的读者很大可能不了解你所做的事情，他们和你不在一个上下文中，如何将你做的事情能够讲到让读者听懂，考验的是对技术的理解深度和总结归纳能力。</p>
<h3 id="刻意练习"><a href="#刻意练习" class="headerlink" title="刻意练习"></a>刻意练习</h3><p>做技术常常有做笔记的习惯，做笔记是否能获得成长？</p>
<h3 id="与业界交流"><a href="#与业界交流" class="headerlink" title="与业界交流"></a>与业界交流</h3><p>当完成一次次技术分享的时候，除了获得个人成长的收获，意料之外的是，业界也给了很多反馈，比如在完成容器相关文章后，在docker社区也有一些比较有深度的提问，比如我们之前招聘时也有面试者说听过我的技术分享。</p>
<h3 id="总结"><a href="#总结" class="headerlink" title="总结"></a>总结</h3><p>总之，技术分享给我的不仅仅是技术上的成长，还带来了其他很多收获，谢谢！</p>
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<h3 id="卷无法正常挂载，但是删除Pod，Pod被重新拉起能正常启动，使用本地存储"><a href="#卷无法正常挂载，但是删除Pod，Pod被重新拉起能正常启动，使用本地存储" class="headerlink" title="卷无法正常挂载，但是删除Pod，Pod被重新拉起能正常启动，使用本地存储"></a>卷无法正常挂载，但是删除Pod，Pod被重新拉起能正常启动，使用本地存储</h3><h4 id="思路"><a href="#思路" class="headerlink" title="思路"></a>思路</h4><ul>
<li><p>环境</p>
<ul>
<li>nfs</li>
<li>csi</li>
</ul>
</li>
<li><p>过程思考</p>
<ul>
<li><p>attach成功</p>
</li>
<li><p>global mount成功</p>
</li>
<li><p>mount -v 应该不成功–检查mount是否成功</p>
<ul>
<li><p>NFS未mount成功，原因<strong>执行mount nfs如果remote target没有也不会报错</strong></p>
</li>
<li><figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">[root@10-10-40-98 ~]# mount -t nfs -o nolock,async,rw,bg,hard,nointr,rsize=32768,wsize=32768,tcp,actimeo=0,vers=3,timeo=600 172.16.130.1:pvc-3eef6820c13e11e8/root /mnt</span><br><span class="line">mount.nfs: backgrounding "172.16.130.1:pvc-3eef6820c13e11e8/root"</span><br><span class="line">mount.nfs: mount options: "rw,nolock,bg,hard,nointr,rsize=32768,wsize=32768,tcp,actimeo=0,vers=3,timeo=600"</span><br><span class="line">[root@10-10-40-98 ~]# echo $?</span><br><span class="line">0</span><br></pre></td></tr></table></figure>
</li>
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<p>最终发现nfs mount参数配置不正确，参数<code>bg</code>释义，简单来讲mount时立即返回，然后后天执行nfs挂载，退出码一直为0</p>
<blockquote>
<p>bg / fg</p>
<p>Determines how the mount(8) command behaves if an attempt to mount an export fails. The fg option causes mount(8) to exit with an error status if any part of the mount request times out or fails outright. This is called a “foreground” mount, and is the default behavior if neither the fg nor bg mount option is specified.<br>If the bg option is specified, a timeout or failure causes the mount(8) command to fork a child which continues to attempt to mount the export. The parent immediately returns with a zero exit code. This is known as a “background” mount.<br>If the local mount point directory is missing, the mount(8) command acts as if the mount request timed out. This permits nested NFS mounts specified in /etc/fstab to proceed in any order during system initialization, even if some NFS servers are not yet available. Alternatively these issues can be addressed using an automounter (refer to automount(8) for details).</p>
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Pod挂载Volume失败问题分析
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<p>本文同步发布于<a href="https://mp.weixin.qq.com/s/L0SYc6vHZN9mZkWpePuoxg" target="_blank" rel="noopener">dockerone</a></p>
<p>Kubernetes环境偶尔出现Statefulset中的Pod被删除，新启动的Pod（还是调度到原有节点）挂载volume失败的问题，如下图，经过一番定位分析，也让我们对于Kubernetes系统复杂程度有了新的认知。</p>
<p><img src="https://raw.githubusercontent.com/kindule/img/master/2018-09-20-090324.png" alt="image-20180919164047762"></p>
<p>在分析此问题之前，作为相关背景知识，先简单介绍对于Kubernetes存储系统的理解。</p>
<h3 id="存储系统简析"><a href="#存储系统简析" class="headerlink" title="存储系统简析"></a>存储系统简析</h3><p>存储也是Kubernetes中比较重要而复杂的系统，功能比较庞大，涉及到不同组件中，不同控制器的协作，如下图。</p>
<p><img src="https://raw.githubusercontent.com/kindule/img/master/2018-10-08-035245.png" alt=""></p>
<p>从三个维度分析</p>
<ul>
<li><p>从卷的生命周期来讲，卷被Pod使用或者卷被回收，会依赖顺序严格的几个阶段</p>
<ul>
<li><p>卷被Pod使用</p>
<ul>
<li>provision，卷分配成功</li>
<li>attach，卷挂载在对应worker node</li>
<li>mount，卷挂载为文件系统并且映射给对应Pod</li>
</ul>
<p>卷要成功被Pod使用，需要遵循以上顺序</p>
</li>
<li><p>卷被回收</p>
<ul>
<li>umount，卷已经和对应worker node解除映射，且已经从文件系统umount</li>
<li>detach，卷已经从worker node卸载</li>
<li>recycle，卷被回收</li>
</ul>
<p>卷要成功回收，需要遵循以上顺序</p>
</li>
</ul>
</li>
<li><p>从Kubernetes存储系统来讲，卷生命周期管理的职责，又分散于不同的控制器中</p>
<ul>
<li>pv controller，负责创建和回收卷</li>
<li>attach detach controller，负责挂载和卸载卷</li>
<li>volume manager，负责mount和umount卷</li>
</ul>
</li>
<li><p>controller模式，每个controller负责特定功能，并且不断进行reconcile（对比期望状态与实际状态），然后进行调整</p>
<p>比如attach detach controller和volume manager中，各自都会有desiredStateOfWorld（缓存期望状态）和actualStateOfWorld（缓存实际状态）缓存，并且由各自的syncLoopFunc不断对比两个缓存的差异，并进行调整，下文中会介绍。</p>
<figure class="highlight go"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">for</span> {</span><br><span class="line"> desired := getDesiredState();</span><br><span class="line"> current := getCurrentState();</span><br><span class="line"> makeChanges(desired, current);</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
</li>
</ul>
<p>结合以上三个维度，<strong>Kubernetes需要保证卷的管理功能分布在不同控制器的前提下保证卷生命周期顺序的正确性</strong>。以Pod使用卷为例，看Kubernetes是如何做到这一点？</p>
<h3 id="Pod启动流程"><a href="#Pod启动流程" class="headerlink" title="Pod启动流程"></a>Pod启动流程</h3><p>假设scheduler已经完成worker node选择，确定调度的节点，此时启动Pod前，需要先完成卷映射到Pod路径中，结合前面的分析，整个过程如下</p>
<ol>
<li><p>卷分配，pvc绑定pv，由pv controller负责完成，结合<a href="https://github.com/kubernetes/kubernetes/blob/release-1.10/pkg/controller/volume/persistentvolume/pv_controller.go#L301" target="_blank" rel="noopener">相关代码</a></p>
<p><img src="https://raw.githubusercontent.com/kindule/img/master/20181018002900.png" alt=""></p>
<p>此时pvc绑定pv</p>
<p><img src="https://raw.githubusercontent.com/kindule/img/master/20181014142538.png" alt=""></p>
</li>
<li><p>attach detach controlle，如果pod分配到worker node，并且对应卷已经创建，则将卷挂载到对应worker node，并且给worker node资源增加volume已经挂载对应卷的状态信息，结合相关<a href="https://github.com/kubernetes/kubernetes/blob/release-1.10/pkg/controller/volume/attachdetach/populator/desired_state_of_world_populator.go#L88" target="_blank" rel="noopener">代码1</a>和<a href="https://github.com/kubernetes/kubernetes/blob/release-1.10/pkg/controller/volume/attachdetach/reconciler/reconciler.go#L251" target="_blank" rel="noopener">代码2</a></p>
<p><img src="https://raw.githubusercontent.com/kindule/img/master/20181018004733.png" alt=""></p>
<p>此时对应node资源状态中增加volume信息</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line">[root@10-10-88-152 ~]# kubectl get nodes 10-10-88-113 -o yaml </span><br><span class="line">apiVersion: v1</span><br><span class="line">kind: Node</span><br><span class="line">....</span><br><span class="line"> volumesAttached:</span><br><span class="line"> - devicePath: csi-add9fc778d9593d01818d65ccde7013e87327d9f675b47df42a34b860c581711</span><br><span class="line"> name: kubernetes.io/csi/csi-qcfsplugin^csi-qcfs-volume-4faa18f5bbbd11e8-1365</span><br><span class="line"> - devicePath: csi-5dd249387138238e8e2209eb471450a072dd6543adde7a6769c8461943c789ca</span><br><span class="line"> name: kubernetes.io/csi/csi-qcfsplugin^csi-qcfs-volume-4fa9b764bbbd11e8-1366</span><br><span class="line"> - devicePath: csi-bc9b81e32d84e8890d17568964c1e01af97b0c175e0b73d4bf30bba54e3f1a1e</span><br><span class="line"> name: kubernetes.io/csi/csi-qcfsplugin^csi-qcfs-volume-4fa94533bbbd11e8-1364</span><br><span class="line"> volumesInUse:</span><br><span class="line"> - kubernetes.io/csi/csi-qcfsplugin^csi-qcfs-volume-4fa94533bbbd11e8-1364</span><br><span class="line"> - kubernetes.io/csi/csi-qcfsplugin^csi-qcfs-volume-4fa9b764bbbd11e8-1366</span><br><span class="line"> - kubernetes.io/csi/csi-qcfsplugin^csi-qcfs-volume-4faa18f5bbbd11e8-1365</span><br></pre></td></tr></table></figure>
</li>
<li><p>volume manager在worker node中负责将卷挂载到对应路径</p>
<ul>
<li><p>pod分配到本worker node后，获取Pod需要的volume，通过对比node状态中的volumesAttached，确认volume是否已经attach到node节点，如果attach到node节点则将自身actualStateOfWorld中的volume状态设置成attached，对应<a href="https://github.com/kubernetes/kubernetes/blob/release-1.10/pkg/kubelet/volumemanager/populator/desired_state_of_world_populator.go#L152" target="_blank" rel="noopener">代码1</a>、<a href="https://github.com/kubernetes/kubernetes/blob/release-1.10/pkg/kubelet/volumemanager/reconciler/reconciler.go#L160" target="_blank" rel="noopener">代码2</a></p>
<p><img src="https://raw.githubusercontent.com/kindule/img/master/20181018011611.png" alt=""></p>
</li>
<li><p>如果已经attached成功，则进入到文件系统挂载流程，相关<a href="https://github.com/kubernetes/kubernetes/blob/release-1.10/pkg/kubelet/volumemanager/reconciler/reconciler.go#L238" target="_blank" rel="noopener">代码</a></p>
<ul>
<li><p>先挂载到node中全局路径，比如<code>/var/lib/kubelet/plugins/kubernetes.io/csi/pv/pvc-3ecd68c7b7d211e8/globalmount</code></p>
</li>
<li><p>映射到Pod对应路径，比如<code>/var/lib/kubelet/pods/49a5fede-b811-11e8-844f-fa7378845e00/volumes/kubernetes.io~csi/pvc-3ecd68c7b7d211e8/mount</code></p>
</li>
<li><p>actualStateOfWorld中设置volume为挂载成功状态</p>
<p><img src="https://raw.githubusercontent.com/kindule/img/master/20181018015029.png" alt=""></p>
</li>
</ul>
</li>
</ul>
</li>
<li><p>pod controller确认卷已经映射成功，启动Pod，此处不详细展开</p>
</li>
</ol>
<h3 id="Pod被删除的过程"><a href="#Pod被删除的过程" class="headerlink" title="Pod被删除的过程"></a>Pod被删除的过程</h3><ol>
<li><p>pod controller watch到pod处于被删除状态，执行killPod操作，删除Pod，此处不详细展开</p>
</li>
<li><p>volume manager获取到Pod被删除的信息，会执行如下几步，相关<a href="https://github.com/kubernetes/kubernetes/blob/release-1.10/pkg/kubelet/volumemanager/reconciler/reconciler.go#L160" target="_blank" rel="noopener">代码</a></p>
<ul>
<li><p>将Pod从desiredStateOfWorld的缓存信息中清除</p>
<p><img src="https://raw.githubusercontent.com/kindule/img/master/20181018024146.png" alt=""></p>
</li>
<li><p>actualStateOfWorld中已经挂载的卷和desiredStateOfWorld发现Pod不应该挂载，执行UmountVolume操作，将Pod和卷映射关系解除，并将Pod从actualStateOfWorld的卷信息中剔除</p>
<p><img src="https://raw.githubusercontent.com/kindule/img/master/20181018024451.png" alt=""></p>
</li>
<li><p>此时如果实际状态中卷没有关联任何Pod，则说明卷需要可以完全与节点分离，则先执行UnmountDevice将卷的globalpath umount掉，等到下次reconcile时执行MarkVolumeAsDetached将卷完全从实际状态中删除掉。</p>
<p><img src="https://raw.githubusercontent.com/kindule/img/master/20181018024518.png" alt=""></p>
</li>
</ul>
</li>
<li><p>attach detach controller发现挂载到node节点的volume没有被Pod使用，执行detach操作，将卷从node节点detach，此时卷完全处于集群中未被使用的状态，此处不详细展开。</p>
</li>
</ol>
<p>总结为Kubernetes存储系统的特点</p>
<ul>
<li>不同组件通过资源状态协作，attach detach controller需要PVC绑定PV的状态，volume manager需要node status中volume attached状态。</li>
<li>组件通过reconcile方式达到期望状态，并且状态可能需要多次reconcile中完成，如Pod清除掉后，volume最终和node分离</li>
</ul>
<h3 id="问题"><a href="#问题" class="headerlink" title="问题"></a>问题</h3><p>理解了存储系统的整体过程之后，回到问题，statefulset中Pod被删除会发生什么？</p>
<p>首先，对于statefulset的了解，Pod被删除，statefulset controller应该会很快创建Pod，在我们的场景中，Pod还是调度到先前节点中启动。结合对存储的理解，可能的场景</p>
<p>场景一 delete Pod，感知顺序为volume manager(umount)->statefulset->scheduler->volume manager(mount)</p>
<ol>
<li>volume manager发现Pod被删除，执行umount</li>
<li>statefulset发现Pod被删除，马上创建Pod</li>
<li>scheduler发现Pod进行调度</li>
<li>volume manager发现原有volume需要绑定Pod，执行mount</li>
</ol>
<p>场景二 delete Pod，感知顺序为volume manager(umount)->volume manager(unmountDevice)->volume manager(MarkVolumeAsDelete)->attach detach controller(Detach)->statefulset->scheduler->attach detach controller(Attach)->volume manager</p>
<ol>
<li>volume manager发现Pod被删除，执行umount/unmountDevice/MarkVolumeAsDelete（通过几次reconcile）</li>
<li>attach detach controller发现volume在node节点未被使用，执行detach</li>
<li>scheduler发现Pod进行调度</li>
<li>attach detach controller发现volume需要attach，执行attach</li>
<li>volume manager挂载</li>
</ol>
<p>场景三 delete Pod，感知顺序为statefulset->volume manager(umount/deviceUmount)->scheduler->volume manager(mount)</p>
<ol>
<li>statefulset发现Pod被删除，马上创建Pod</li>
<li>volume manager发现Pod被删除，执行umount/deviceUmount（通过几次reconcile），注意此时devicePath和deviceMountPath都为空</li>
<li>scheduler发现Pod进行调度</li>
<li>volume manager发现原有volume需要绑定Pod，执行mount而此时devicePath和deviceMountPath都为空，<strong>问题出现</strong></li>
</ol>
<p>再结合问题出现日志分析</p>
<figure class="highlight verilog"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line">Sep <span class="number">14</span> <span class="number">19</span>:<span class="number">28</span>:<span class="number">33</span> <span class="number">10</span>-<span class="number">10</span>-<span class="number">40</span>-<span class="number">16</span> kubelet: I0914 <span class="number">19</span>:<span class="number">28</span>:<span class="number">33</span><span class="variable">.174310</span> <span class="number">1953</span> operation_generator<span class="variable">.go</span>:<span class="number">1168</span>] Controller attach succeeded <span class="keyword">for</span> volume <span class="string">"pvc-3ecd68c7b7d211e8"</span> (UniqueName: <span class="string">"kubernetes.io/csi/csi-qcfsplugin^csi-qcfs-volume-3ecd68c7b7d211e8-338"</span>) pod <span class="string">"yoooo-416ea0-0"</span> (UID: <span class="string">"49a5fede-b811-11e8-844f-fa7378845e00"</span>) device path: <span class="string">"csi-eb93736e654600786d95eaffa7cd5d616f11a90bdc109e0df575e8646c250eb2"</span></span><br><span class="line">Sep <span class="number">14</span> <span class="number">19</span>:<span class="number">28</span>:<span class="number">33</span> <span class="number">10</span>-<span class="number">10</span>-<span class="number">40</span>-<span class="number">16</span> kubelet: I0914 <span class="number">19</span>:<span class="number">28</span>:<span class="number">33</span><span class="variable">.273344</span> <span class="number">1953</span> operation_generator<span class="variable">.go</span>:<span class="number">486</span>] MountVolume<span class="variable">.WaitForAttach</span> entering <span class="keyword">for</span> volume <span class="string">"pvc-3ecd68c7b7d211e8"</span> (UniqueName: <span class="string">"kubernetes.io/csi/csi-qcfsplugin^csi-qcfs-volume-3ecd68c7b7d211e8-338"</span>) pod <span class="string">"yoooo-416ea0-0"</span> (UID: <span class="string">"49a5fede-b811-11e8-844f-fa7378845e00"</span>) DevicePath <span class="string">"csi-eb93736e654600786d95eaffa7cd5d616f11a90bdc109e0df575e8646c250eb2"</span></span><br><span class="line">Sep <span class="number">14</span> <span class="number">19</span>:<span class="number">28</span>:<span class="number">33</span> <span class="number">10</span>-<span class="number">10</span>-<span class="number">40</span>-<span class="number">16</span> kubelet: I0914 <span class="number">19</span>:<span class="number">28</span>:<span class="number">33</span><span class="variable">.318275</span> <span class="number">1953</span> operation_generator<span class="variable">.go</span>:<span class="number">495</span>] MountVolume<span class="variable">.WaitForAttach</span> succeeded <span class="keyword">for</span> volume <span class="string">"pvc-3ecd68c7b7d211e8"</span> (UniqueName: <span class="string">"kubernetes.io/csi/csi-qcfsplugin^csi-qcfs-volume-3ecd68c7b7d211e8-338"</span>) pod <span class="string">"yoooo-416ea0-0"</span> (UID: <span class="string">"49a5fede-b811-11e8-844f-fa7378845e00"</span>) DevicePath <span class="string">"csi-eb93736e654600786d95eaffa7cd5d616f11a90bdc109e0df575e8646c250eb2"</span></span><br><span class="line">Sep <span class="number">14</span> <span class="number">19</span>:<span class="number">28</span>:<span class="number">33</span> <span class="number">10</span>-<span class="number">10</span>-<span class="number">40</span>-<span class="number">16</span> kubelet: I0914 <span class="number">19</span>:<span class="number">28</span>:<span class="number">33</span><span class="variable">.319345</span> <span class="number">1953</span> operation_generator<span class="variable">.go</span>:<span class="number">514</span>] MountVolume<span class="variable">.MountDevice</span> succeeded <span class="keyword">for</span> volume <span class="string">"pvc-3ecd68c7b7d211e8"</span> (UniqueName: <span class="string">"kubernetes.io/csi/csi-qcfsplugin^csi-qcfs-volume-3ecd68c7b7d211e8-338"</span>) pod <span class="string">"yoooo-416ea0-0"</span> (UID: <span class="string">"49a5fede-b811-11e8-844f-fa7378845e00"</span>) device mount path <span class="string">"/var/lib/kubelet/plugins/kubernetes.io/csi/pv/pvc-3ecd68c7b7d211e8/globalmount"</span></span><br><span class="line">Sep <span class="number">14</span> <span class="number">19</span>:<span class="number">29</span>:<span class="number">12</span> <span class="number">10</span>-<span class="number">10</span>-<span class="number">40</span>-<span class="number">16</span> kubelet: I0914 <span class="number">19</span>:<span class="number">29</span>:<span class="number">12</span><span class="variable">.826916</span> <span class="number">1953</span> operation_generator<span class="variable">.go</span>:<span class="number">486</span>] MountVolume<span class="variable">.WaitForAttach</span> entering <span class="keyword">for</span> volume <span class="string">"pvc-3ecd68c7b7d211e8"</span> (UniqueName: <span class="string">"kubernetes.io/csi/csi-qcfsplugin^csi-qcfs-volume-3ecd68c7b7d211e8-338"</span>) pod <span class="string">"yoooo-416ea0-0"</span> (UID: <span class="string">"67f223dc-b811-11e8-844f-fa7378845e00"</span>) DevicePath <span class="string">"csi-eb93736e654600786d95eaffa7cd5d616f11a90bdc109e0df575e8646c250eb2"</span></span><br><span class="line">Sep <span class="number">14</span> <span class="number">19</span>:<span class="number">29</span>:<span class="number">14</span> <span class="number">10</span>-<span class="number">10</span>-<span class="number">40</span>-<span class="number">16</span> kubelet: I0914 <span class="number">19</span>:<span class="number">29</span>:<span class="number">14</span><span class="variable">.465225</span> <span class="number">1953</span> operation_generator<span class="variable">.go</span>:<span class="number">495</span>] MountVolume<span class="variable">.WaitForAttach</span> succeeded <span class="keyword">for</span> volume <span class="string">"pvc-3ecd68c7b7d211e8"</span> (UniqueName: <span class="string">"kubernetes.io/csi/csi-qcfsplugin^csi-qcfs-volume-3ecd68c7b7d211e8-338"</span>) pod <span class="string">"yoooo-416ea0-0"</span> (UID: <span class="string">"67f223dc-b811-11e8-844f-fa7378845e00"</span>) DevicePath <span class="string">"csi-eb93736e654600786d95eaffa7cd5d616f11a90bdc109e0df575e8646c250eb2"</span></span><br><span class="line">Sep <span class="number">14</span> <span class="number">19</span>:<span class="number">29</span>:<span class="number">14</span> <span class="number">10</span>-<span class="number">10</span>-<span class="number">40</span>-<span class="number">16</span> kubelet: I0914 <span class="number">19</span>:<span class="number">29</span>:<span class="number">14</span><span class="variable">.466483</span> <span class="number">1953</span> operation_generator<span class="variable">.go</span>:<span class="number">514</span>] MountVolume<span class="variable">.MountDevice</span> succeeded <span class="keyword">for</span> volume <span class="string">"pvc-3ecd68c7b7d211e8"</span> (UniqueName: <span class="string">"kubernetes.io/csi/csi-qcfsplugin^csi-qcfs-volume-3ecd68c7b7d211e8-338"</span>) pod <span class="string">"yoooo-416ea0-0"</span> (UID: <span class="string">"67f223dc-b811-11e8-844f-fa7378845e00"</span>) device mount path <span class="string">"/var/lib/kubelet/plugins/kubernetes.io/csi/pv/pvc-3ecd68c7b7d211e8/globalmount"</span></span><br><span class="line">Sep <span class="number">14</span> <span class="number">19</span>:<span class="number">29</span>:<span class="number">15</span> <span class="number">10</span>-<span class="number">10</span>-<span class="number">40</span>-<span class="number">16</span> kubelet: W0914 <span class="number">19</span>:<span class="number">29</span>:<span class="number">15</span><span class="variable">.491424</span> <span class="number">1953</span> csi_mounter<span class="variable">.go</span>:<span class="number">354</span>] kubernetes<span class="variable">.io</span>/csi: skipping mount dir removal, path does <span class="keyword">not</span> exist [/<span class="keyword">var</span>/lib/kubelet/pods/<span class="number">49</span>a5fede-b811-<span class="number">11</span>e8-<span class="number">844</span>f-fa7378845e00/volumes/kubernetes<span class="variable">.io</span>~csi/pvc-<span class="number">3</span>ecd68c7b7d211e8/mount]</span><br><span class="line">Sep <span class="number">14</span> <span class="number">19</span>:<span class="number">29</span>:<span class="number">15</span> <span class="number">10</span>-<span class="number">10</span>-<span class="number">40</span>-<span class="number">16</span> kubelet: I0914 <span class="number">19</span>:<span class="number">29</span>:<span class="number">15</span><span class="variable">.491450</span> <span class="number">1953</span> operation_generator<span class="variable">.go</span>:<span class="number">686</span>] UnmountVolume<span class="variable">.TearDown</span> succeeded <span class="keyword">for</span> volume <span class="string">"kubernetes.io/csi/csi-qcfsplugin^csi-qcfs-volume-3ecd68c7b7d211e8-338"</span> (OuterVolumeSpecName: <span class="string">"data"</span>) pod <span class="string">"49a5fede-b811-11e8-844f-fa7378845e00"</span> (UID: <span class="string">"49a5fede-b811-11e8-844f-fa7378845e00"</span>). InnerVolumeSpecName <span class="string">"pvc-3ecd68c7b7d211e8"</span>. PluginName <span class="string">"kubernetes.io/csi"</span>, VolumeGidValue <span class="string">""</span></span><br><span class="line">Sep <span class="number">14</span> <span class="number">19</span>:<span class="number">29</span>:<span class="number">44</span> <span class="number">10</span>-<span class="number">10</span>-<span class="number">40</span>-<span class="number">16</span> kubelet: W0914 <span class="number">19</span>:<span class="number">29</span>:<span class="number">44</span><span class="variable">.896387</span> <span class="number">1953</span> csi_mounter<span class="variable">.go</span>:<span class="number">354</span>] kubernetes<span class="variable">.io</span>/csi: skipping mount dir removal, path does <span class="keyword">not</span> exist [/<span class="keyword">var</span>/lib/kubelet/pods/<span class="number">67</span>f223dc-b811-<span class="number">11</span>e8-<span class="number">844</span>f-fa7378845e00/volumes/kubernetes<span class="variable">.io</span>~csi/pvc-<span class="number">3</span>ecd68c7b7d211e8/mount]</span><br><span class="line">Sep <span class="number">14</span> <span class="number">19</span>:<span class="number">29</span>:<span class="number">44</span> <span class="number">10</span>-<span class="number">10</span>-<span class="number">40</span>-<span class="number">16</span> kubelet: I0914 <span class="number">19</span>:<span class="number">29</span>:<span class="number">44</span><span class="variable">.896403</span> <span class="number">1953</span> operation_generator<span class="variable">.go</span>:<span class="number">686</span>] UnmountVolume<span class="variable">.TearDown</span> succeeded <span class="keyword">for</span> volume <span class="string">"kubernetes.io/csi/csi-qcfsplugin^csi-qcfs-volume-3ecd68c7b7d211e8-338"</span> (OuterVolumeSpecName: <span class="string">"data"</span>) pod <span class="string">"67f223dc-b811-11e8-844f-fa7378845e00"</span> (UID: <span class="string">"67f223dc-b811-11e8-844f-fa7378845e00"</span>). InnerVolumeSpecName <span class="string">"pvc-3ecd68c7b7d211e8"</span>. PluginName <span class="string">"kubernetes.io/csi"</span>, VolumeGidValue <span class="string">""</span></span><br><span class="line">Sep <span class="number">14</span> <span class="number">19</span>:<span class="number">29</span>:<span class="number">44</span> <span class="number">10</span>-<span class="number">10</span>-<span class="number">40</span>-<span class="number">16</span> kubelet: I0914 <span class="number">19</span>:<span class="number">29</span>:<span class="number">44</span><span class="variable">.917540</span> <span class="number">1953</span> reconciler<span class="variable">.go</span>:<span class="number">278</span>] operationExecutor<span class="variable">.UnmountDevice</span> started <span class="keyword">for</span> volume <span class="string">"pvc-3ecd68c7b7d211e8"</span> (UniqueName: <span class="string">"kubernetes.io/csi/csi-qcfsplugin^csi-qcfs-volume-3ecd68c7b7d211e8-338"</span>) on node <span class="string">"10-10-40-16"</span></span><br><span class="line">Sep <span class="number">14</span> <span class="number">19</span>:<span class="number">29</span>:<span class="number">44</span> <span class="number">10</span>-<span class="number">10</span>-<span class="number">40</span>-<span class="number">16</span> kubelet: W0914 <span class="number">19</span>:<span class="number">29</span>:<span class="number">44</span><span class="variable">.919231</span> <span class="number">1953</span> mount_linux<span class="variable">.go</span>:<span class="number">179</span>] could <span class="keyword">not</span> determine device <span class="keyword">for</span> path: <span class="string">"/var/lib/kubelet/plugins/kubernetes.io/csi/pv/pvc-3ecd68c7b7d211e8/globalmount"</span></span><br><span class="line">Sep <span class="number">14</span> <span class="number">19</span>:<span class="number">29</span>:<span class="number">45</span> <span class="number">10</span>-<span class="number">10</span>-<span class="number">40</span>-<span class="number">16</span> kubelet: I0914 <span class="number">19</span>:<span class="number">29</span>:<span class="number">45</span><span class="variable">.609605</span> <span class="number">1953</span> operation_generator<span class="variable">.go</span>:<span class="number">760</span>] UnmountDevice succeeded <span class="keyword">for</span> volume <span class="string">"pvc-3ecd68c7b7d211e8"</span> %!(EXTRA <span class="keyword">string</span>=UnmountDevice succeeded <span class="keyword">for</span> volume <span class="string">"pvc-3ecd68c7b7d211e8"</span> (UniqueName: <span class="string">"kubernetes.io/csi/csi-qcfsplugin^csi-qcfs-volume-3ecd68c7b7d211e8-338"</span>) on node <span class="string">"10-10-40-16"</span> )</span><br><span class="line">Sep <span class="number">14</span> <span class="number">19</span>:<span class="number">29</span>:<span class="number">45</span> <span class="number">10</span>-<span class="number">10</span>-<span class="number">40</span>-<span class="number">16</span> kubelet: I0914 <span class="number">19</span>:<span class="number">29</span>:<span class="number">45</span><span class="variable">.624963</span> <span class="number">1953</span> operation_generator<span class="variable">.go</span>:<span class="number">486</span>] MountVolume<span class="variable">.WaitForAttach</span> entering <span class="keyword">for</span> volume <span class="string">"pvc-3ecd68c7b7d211e8"</span> (UniqueName: <span class="string">"kubernetes.io/csi/csi-qcfsplugin^csi-qcfs-volume-3ecd68c7b7d211e8-338"</span>) pod <span class="string">"yoooo-416ea0-0"</span> (UID: <span class="string">"77b8caf7-b811-11e8-844f-fa7378845e00"</span>) DevicePath <span class="string">""</span></span><br><span class="line">Sep <span class="number">14</span> <span class="number">19</span>:<span class="number">29</span>:<span class="number">46</span> <span class="number">10</span>-<span class="number">10</span>-<span class="number">40</span>-<span class="number">16</span> kubelet: E0914 <span class="number">19</span>:<span class="number">29</span>:<span class="number">46</span><span class="variable">.006612</span> <span class="number">1953</span> nestedpendingoperations<span class="variable">.go</span>:<span class="number">267</span>] Operation <span class="keyword">for</span> <span class="string">"\"kubernetes.io/csi/csi-qcfsplugin^csi-qcfs-volume-3ecd68c7b7d211e8-338\""</span> failed. No retries permitted <span class="keyword">until</span> <span class="number">2018</span>-<span class="number">09</span>-<span class="number">14</span> <span class="number">19</span>:<span class="number">29</span>:<span class="number">46</span><span class="variable">.506583596</span> +<span class="number">0800</span> CST m=+<span class="number">105572</span><span class="variable">.978439381</span> (durationBeforeRetry <span class="number">500</span>ms). Error: <span class="string">"MountVolume.WaitForAttach failed for volume \"pvc-3ecd68c7b7d211e8\" (UniqueName: \"kubernetes.io/csi/csi-qcfsplugin^csi-qcfs-volume-3ecd68c7b7d211e8-338\") pod \"yoooo-416ea0-0\" (UID: \"77b8caf7-b811-11e8-844f-fa7378845e00\") : resource name may not be empty"</span></span><br><span class="line">Sep <span class="number">14</span> <span class="number">19</span>:<span class="number">29</span>:<span class="number">46</span> <span class="number">10</span>-<span class="number">10</span>-<span class="number">40</span>-<span class="number">16</span> kubelet: I0914 <span class="number">19</span>:<span class="number">29</span>:<span class="number">46</span><span class="variable">.533962</span> <span class="number">1953</span> operation_generator<span class="variable">.go</span>:<span class="number">486</span>] MountVolume<span class="variable">.WaitForAttach</span> entering <span class="keyword">for</span> volume <span class="string">"pvc-3ecd68c7b7d211e8"</span> (UniqueName: <span class="string">"kubernetes.io/csi/csi-qcfsplugin^csi-qcfs-volume-3ecd68c7b7d211e8-338"</span>) pod <span class="string">"yoooo-416ea0-0"</span> (UID: <span class="string">"77b8caf7-b811-11e8-844f-fa7378845e00"</span>) DevicePath <span class="string">""</span></span><br></pre></td></tr></table></figure>
<p>WaitForAttach有两个阶段</p>
<ul>
<li><code>Sep 14 19:29:14</code>以及之前DevicePath非空</li>
<li><code>Sep 14 19:29:45</code>以及之后DevicePath为空</li>
</ul>
<p>那么在这两个时间点之间发生了什么，怀疑这个时间点时间发生的问题造成卷无法挂载</p>
<p>通过日志发现<code>Sep 14 19:29:14</code>到<code>Sep 14 19:29:45</code>有一段日志信息比较关键，分析如下</p>
<ol>
<li>Sep 14 19:29:14 …… MountVolume.MountDevice ……</li>
<li>Sep 14 19:29:15 ….. UnmountVolume.TearDown ……</li>
<li>Sep 14 19:29:44 …… UnmountVolume.TearDown ……</li>
<li>Sep 14 19:29:44 …… operationExecutor.UnmountDevice ……</li>
<li>Sep 14 19:29:44 …… could not determine device for path ….</li>
</ol>
<p>在步骤4中，有设置相关函数的</p>
<blockquote>
<p>UnmountDevice->GenerateUnmountDeviceFunc->actualStateOfWorld.MarkDeviceAsUnmounted->asw.SetVolumeGloballyMounted</p>
</blockquote>
<p>其中比较关键的函数<code>SetVolumeGloballyMounted</code></p>
<figure class="highlight go"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">asw.SetVolumeGloballyMounted(volumeName, <span class="literal">false</span> <span class="comment">/* globallyMounted */</span>, <span class="comment">/* devicePath */</span><span class="string">""</span>, <span class="comment">/* deviceMountPath */</span><span class="string">""</span>)</span><br></pre></td></tr></table></figure>
<h3 id="总结"><a href="#总结" class="headerlink" title="总结"></a>总结</h3><p>Kubernetes之所以在当前成为容器编排领域的事实标准，原因很多，但是对我们来讲基于声明式API的编程范式是我们依赖Kubernetes的重要原因，当然在其解决的问题规模下复杂程度也不言而喻，总之，一句话，没有银弹。</p>
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Clean Architecture读书笔记（一）
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