解決yum install redhat-lsb遇到的問題

解決yum install  redhat-lsb遇到的問題

       一、 背景：centos 7.2.1511 系統中沒有lsb_release命令。

       二、解決方法：在終端中輸入：yum install -y redhat-lsb

       三、遇到的問題如下：

        Loaded plugins: fastestmirror, langpacks
Existing lock /var/run/yum.pid: another copy is running as pid 3414.
Another app is currently holding the yum lock; waiting for it to exit...
  The other application is: PackageKit
    Memory :  46 M RSS (449 MB VSZ)
    Started: Sun Oct 16 22:20:56 2016 - 01:10 ago
    State  : Sleeping, pid: 3414
Another app is currently holding the yum lock; waiting for it to exit...
  The other application is: PackageKit
    Memory :  46 M RSS (449 MB VSZ)
    Started: Sun Oct 16 22:20:56 2016 - 01:12 ago
    State  : Sleeping, pid: 3414
Another app is currently holding the yum lock; waiting for it to exit...
  The other application is: PackageKit
    Memory :  46 M RSS (449 MB VSZ)
    Started: Sun Oct 16 22:20:56 2016 - 01:14 ago
    State  : Sleeping, pid: 3414

       四、 解決問題的步驟：1）在終端輸入：kill  -9  3414

                                                2）在終端輸入：rm -fr /var/run/yum.pid

                                                3）在終端輸入：yum install -y redhat-lsb

       五、驗證安裝lsb_release

                                               1）在終端輸入：lsb_release -a

                                                  出現如下資訊算成功了.            

                        LSB Version:    :core-4.1-amd64:core-4.1-noarch:cxx-4.1-amd64:cxx-4.1-noarch:desktop-4.1-amd64:desktop-4.1-noarch:languages-4.1-amd64:languages-4.1-noarch:printing-4.1-amd64:printing-4.1-noarch
                        Distributor ID:    CentOS
                        Description:    CentOS Linux release 7.2.1511 (Core)
                        Release:    7.2.1511
                        Codename:    Core