问题描述：

今天想在虚拟机上重新安装docker
然后使用到yum命令报错：

Loaded plugins: fastestmirror, langpacks
Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fast
Existing lock /var/run/yum.pid: another copy is running as pid 3797.
Another app is currently holding the yum lock; waiting for it to exit...
  The other application is: PackageKit
    Memory : 131 M RSS (1.5 GB VSZ)
    Started: Sun Jan 10 07:07:44 2021 - 01:01 ago
    State  : Sleeping, pid: 3797

解决办法：

输入：

rm -f /var/run/yum.pid

然后重新运行刚才的yum命令即可

原因:

可能是系统自动升级正在运行，yum在锁定状态中，要等待那个进程结束退出:
看报错的那一段话：

Another app is currently holding the yum lock; waiting for it to exit...

你可以看一下是否有yum进程

ps aux|grep yum

如果文章对你有帮助，不要忘了给我点个赞吼(￣▽￣)~
欢迎关注我的微信公众号：松鼠技术站