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

有时用yum安装docker或者升级时，会出现以下情况：

[root@dockerserver2 ~]# yum install docker

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 4279.

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

The other application is: PackageKit

Memory : 132 M RSS (1.0 GB VSZ)

Started: Mon Sep 26 06:27:37 2016 - 04:18 ago

State : Sleeping, pid: 4279

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

The other application is: PackageKit

Memory : 132 M RSS (1.0 GB VSZ)

Started: Mon Sep 26 06:27:37 2016 - 04:20 ago

State : Sleeping, pid: 4279

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

The other application is: PackageKit

Memory : 132 M RSS (1.0 GB VSZ)

Started: Mon Sep 26 06:27:37 2016 - 04:22 ago

State : Sleeping, pid: 4279

可以通过强制关掉yum进程来解决处理

rm -f /var/run/yum.pid

删除后，安装正常操作

Exiting on user cancel.

[root@dockerserver2 ~]# rm -f /var/run/yum.pid

[root@dockerserver2 ~]# yum install docker

Loaded plugins: fastestmirror, langpacks

Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fast

base | 3.6 kB 00:00:00

extras | 3.4 kB 00:00:00

updates | 3.4 kB 00:00:00

(1/2): extras/7/x86_64/primary_db | 165 kB 00:00:00

(2/2): updates/7/x86_64/primary_db | 7.8 MB 00:00:02

Loading mirror speeds from cached hostfile

* base: mirrors.tuna.tsinghua.edu.cn

* extras: mirrors.btte.net

* updates: mirrors.neusoft.edu.cn

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