https://anTtutu.github.io/tags/%E4%BA%91%E6%9C%8D%E5%8A%A1/ Recent content in 云服务 on Anttu's Blog Hugo zh-CN Fri, 22 Jan 2021 08:00:00 +0800 https://anTtutu.github.io/post/2021-01-22-cloud-disk-fstab-uuid/ Fri, 22 Jan 2021 08:00:00 +0800 https://anTtutu.github.io/post/2021-01-22-cloud-disk-fstab-uuid/ <h2 id="前言">前言</h2> <p>2020-03-28 碰到一个云服务器的问题：<code>/dev/sdd</code> 盘符跳变成了 <code>/dev/sde</code>，因为 fstab 里还写着旧设备名还带启动检查，直接导致服务器重启失败。记录下处理过程和以后的挂载规范。</p> <h2 id="1事故经过">1、事故经过</h2> <p>出问题的 fstab 长这样：</p> <div class="highlight"><div style="background-color:#f7f7f7;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"> <table style="border-spacing:0;padding:0;margin:0;border:0;"><tr><td style="vertical-align:top;padding:0;margin:0;border:0;"> <pre tabindex="0" style="background-color:#f7f7f7;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 1 </span><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 2 </span><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 3 </span><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 4 </span><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 5 </span><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 6 </span><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 7 </span><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 8 </span><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 9 </span><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">10 </span></code></pre></td> <td style="vertical-align:top;padding:0;margin:0;border:0;;width:100%"> <pre tabindex="0" style="background-color:#f7f7f7;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-txt" data-lang="txt"><span style="display:flex;"><span># /etc/fstab </span></span><span style="display:flex;"><span>UUID=adc76f7c-fef6-4075-941e-e7ce50fb3e50 / ext4 defaults 1 1 </span></span><span style="display:flex;"><span>tmpfs /dev/shm tmpfs defaults 0 0 </span></span><span style="display:flex;"><span>devpts /dev/pts devpts gid=5,mode=620 0 0 </span></span><span style="display:flex;"><span>sysfs /sys sysfs defaults 0 0 </span></span><span style="display:flex;"><span>proc /proc proc defaults 0 0 </span></span><span style="display:flex;"><span> </span></span><span style="display:flex;"><span>/dev/mapper/VolGroup-lv_mysql /data ext4 defaults 1 1 </span></span><span style="display:flex;"><span>#/dev/sdd /dbbackup ext4 defaults 1 1 </span></span><span style="display:flex;"><span>UUID=ee7bdf7f-c4b6-4ac0-bbbf-3d7c21d6283b /dbbackup ext4 0 0 </span></span></code></pre></td></tr></table> </div> </div><p>问题出在 <code>/dev/sdd</code>：原来这块盘有 1T，fstab 里按设备名挂载到 /dbbackup，而且最后两个参数是 <code>1 1</code>（开机 fsck 检查）。后来扩容新加了一块 500G 的盘，<strong>云平台重新分配设备名时，新盘占了 sdd 的位置，原 sdd 顺移成了 sde</strong>——fstab 里写的 <code>/dev/sdd</code> 现在指向的是新盘，挂载失败、fsck 检查也失败，重启直接卡死进不了系统。</p>