Another app is currently holding the yum lock; waiting for it to exit...
The other application is: yum
Memory : 125 M RSS (1.3 GB VSZ)
Started: Sun Jul 8 08:48:46 2018 - 03:43 ago
State : Running, pid: 898
强制关掉yum进程：
<code class="hljs lasso has-numbering"><span class="hljs-variable">#rm</span> <span class="hljs-attribute">-f</span> /<span class="hljs-built_in">var</span>/run/yum<span class="hljs-built_in">.</span>pid</code>
