安裝cloudera namager時，cloudera-scm-server可以正常啟動，cloudera-scm-agent啟動失敗：

檢視日誌
/opt/cm-5.7.0/log/cloudera-scm-agent/cloudera-scm-agent.out的內容，列印一下內容：

<code class="hljs oxygene has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">/opt/cm-<span class="hljs-number" style="color:#06666;box-sizing: border-box;">5.7</span>.<span class="hljs-number" style="color:#06666;box-sizing: border-box;">0</span>/lib64/cmf/agent/build/env/lib/python2.<span class="hljs-number" style="color:#06666;box-sizing: border-box;">6</span>/site-packages/cmf-<span class="hljs-number" style="color:#06666;box-sizing: border-box;">5.7</span>.<span class="hljs-number" style="color:#06666;box-sizing: border-box;">0</span>-py2.<span class="hljs-number" style="color:#06666;box-sizing: border-box;">6</span>.egg/cmf/parcel.py:<span class="hljs-number" style="color:#06666;box-sizing: border-box;">17</span>: DeprecationWarning: the sets <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">module</span> <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">is</span> <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">deprecated</span>
  <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">from</span> sets import <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">Set</span>
[<span class="hljs-number" style="color:#06666;box-sizing: border-box;">11</span>/May/<span class="hljs-number" style="color:#06666;box-sizing: border-box;">2016</span> <span class="hljs-number" style="color:#06666;box-sizing: border-box;">10</span>:<span class="hljs-number" style="color:#06666;box-sizing: border-box;">12</span>:<span class="hljs-number" style="color:#06666;box-sizing: border-box;">05</span> +<span class="hljs-number" style="color:#06666;box-sizing: border-box;">0000</span>] <span class="hljs-number" style="color:#06666;box-sizing: border-box;">31760</span> MainThread agent        INFO     SCM Agent Version: <span class="hljs-number" style="color:#06666;box-sizing: border-box;">5.7</span>.<span class="hljs-number" style="color:#06666;box-sizing: border-box;">0</span>
Unable <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">to</span> <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">create</span> the pidfile.
</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li></ul>

解決

執行命令

mkdir /opt/cm-5.7.0/run/cloudera-scm-agent

再次嘗試，啟動成功。