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<h1 id="Introduction"><a href="#Introduction" class="headerlink" title="Introduction"></a>Introduction</h1><p>本文延續之前研究 drbd 9.0 網路的工作流程，這篇文章主要在研究其 kernel space 中的行為與邏輯。</p>
<p>從之前 <code>drbdsetup</code> 那邊可以觀察到，這三個指令的結構如下，其中要特別注意的就是<br><strong>DRBD_ADM_CONNECT</strong>, <strong>DRBD_ADM_NEW_PEER</strong> 以及 <strong>DRBD_ADM_NEW_PATH</strong>。<br>這三個數值其實是給 netlink 使用的，在 kernel 端會去註冊遇到三種類型的 netlink 應該要怎麼處理。<br><figure class="highlight c"><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="number">0397</span> {<span class="string">"connect"</span>, CTX_PEER_NODE,</span><br><span class="line"><span class="number">0398</span> DRBD_ADM_CONNECT, DRBD_NLA_CONNECT_PARMS,</span><br><span class="line"><span class="number">0399</span> F_CONFIG_CMD,</span><br><span class="line"><span class="number">0400</span> .ctx = &connect_cmd_ctx,</span><br><span class="line"><span class="number">0401</span> .summary = <span class="string">"Attempt to (re)establish a replication link to a peer host."</span> },</span><br></pre></td></tr></table></figure></p>
<figure class="highlight c"><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="number">0403</span> {<span class="string">"new-peer"</span>, CTX_PEER_NODE,</span><br><span class="line"><span class="number">0404</span> DRBD_ADM_NEW_PEER, DRBD_NLA_NET_CONF,</span><br><span class="line"><span class="number">0405</span> F_CONFIG_CMD,</span><br><span class="line"><span class="number">0406</span> .ctx = &new_peer_cmd_ctx,</span><br><span class="line"><span class="number">0407</span> .summary = <span class="string">"Make a peer host known to a resource."</span> },</span><br></pre></td></tr></table></figure>
<figure class="highlight c"><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></pre></td><td class="code"><pre><span class="line"><span class="number">0415</span> {<span class="string">"new-path"</span>, CTX_PEER_NODE,</span><br><span class="line"><span class="number">0416</span> DRBD_ADM_NEW_PATH, DRBD_NLA_PATH_PARMS,</span><br><span class="line"><span class="number">0417</span> F_CONFIG_CMD,</span><br><span class="line"><span class="number">0418</span> .drbd_args = (struct drbd_argument[]) {</span><br><span class="line"><span class="number">0419</span> { <span class="string">"local-addr"</span>, T_my_addr, conv_addr },</span><br><span class="line"><span class="number">0420</span> { <span class="string">"remote-addr"</span>, T_peer_addr, conv_addr },</span><br><span class="line"><span class="number">0421</span> { } },</span><br><span class="line"><span class="number">0422</span> .ctx = &path_cmd_ctx,</span><br><span class="line"><span class="number">0423</span> .summary = <span class="string">"Add a path (endpoint address pair) where a peer host should be reachable."</span> },</span><br></pre></td></tr></table></figure>
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<h1 id="Architecture"><a href="#Architecture" class="headerlink" title="Architecture"></a>Architecture</h1><p>整個 DRBD 分成 kernel space 跟 user space。<br>主要的功能都在 kernal space，在 9.0 版本中包含了兩個 kernel module(商業版還在多一個RDMA)，其中 <strong>drbd_transport_tcp.ko</strong>專心負責 TCP 連線的部分，剩下的功能都在 <strong>drbd.ko</strong> 中實現。<br>而 user space 則是負責提供用戶一個方便的操作，如<code>drbdadm</code>這方面的工具，當用戶執行如 <strong>drbdadm up r0</strong> 這些指令後，最後會透過 <strong>drbdsetup</strong> 將必要的資訊透過 <strong>netlink</strong>的方式送往 kernel space，而先前的 kernel module 則會在 insert 時就註冊許多 netlink event，每種type都有對應的 handler來處理。<br>如下圖呈現</p>
<p><img src="http://i.imgur.com/SNMiWYj.jpg" alt="img"><br>
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<h1 id="Install-LXR-on-Ubuntu-16-04"><a href="#Install-LXR-on-Ubuntu-16-04" class="headerlink" title="Install LXR on Ubuntu 16.04"></a>Install LXR on Ubuntu 16.04</h1><p>In this article, I will write down a example to descrip how to setup the <strong>LXR</strong>(Linux Cross Reference) with multiple projects support. In this configuration, your can view multiple projects’ refernce in one LXR service.<br>For this article, I use the <strong>Ceph</strong> and <strong>DRBD</strong> for my LXR projtects.</p>
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