CentOS 7更新时出现：Multilib version problems问题的解决方法

前言

关于CentOS的出身就不多多说了，拥有RHEL所有功能和性能，甚至更加友好，最重要一点是免费，深受大家的喜爱，CentOS的受欢迎程度并不亚于Ubuntu，之前安装了CentOS7，关于安装的教程，有需要的朋友们可以参考这篇文章：http://www.jb51.net/article/95263.htm ，下面话不多说了，来一起看看详细的介绍吧。

发现问题

最近这两天在更新CentOS7系统时，出现了Multilib version problems错误，执行命令：

# yum update

出现了的错误信息：

....
---> Package libcap-ng.i686 0:0.7.5-4.el7 will be installed
---> Package libstdc++.i686 0:4.8.5-16.el7 will be installed
--> Finished Dependency Resolution
Error: Multilib version problems found. This often means that the root
 cause is something else and multilib version checking is just
 pointing out that there is a problem. Eg.:

  1. You have an upgrade for glibc which is missing some
  dependency that another package requires. Yum is trying to
  solve this by installing an older version of glibc of the
  different architecture. If you exclude the bad architecture
  yum will tell you what the root cause is (which package
  requires what). You can try redoing the upgrade with
  --exclude glibc.otherarch ... this should give you an error
  message showing the root cause of the problem.

  2. You have multiple architectures of glibc installed, but
  yum can only see an upgrade for one of those architectures.
  If you don't want/need both architectures anymore then you
  can remove the one with the missing update and everything
  will work.

  3. You have duplicate versions of glibc installed already.
  You can use "yum check" to get yum show these errors.

 ...you can also use --setopt=protected_multilib=false to remove
 this checking, however this is almost never the correct thing to
 do as something else is very likely to go wrong (often causing
 much more problems).

 Protected multilib versions: glibc-2.17-196.el7.i686 != glibc-2.17-157.el7_3.1.x86_64
Error: Protected multilib versions: pcre-8.32-17.el7.i686 != pcre-8.32-15.el7_2.1.x86_64
Error: Protected multilib versions: elfutils-libs-0.168-8.el7.i686 != elfutils-libs-0.166-2.el7.x86_64
......

解决过程如下：

//查询重复的软件包
# rpm -q systemd-libs
systemd-libs-219-30.el7.x86_64
systemd-libs-219-42.el7_4.1.x86_64

//删除旧版
# rpm -e systemd-libs-219-30.el7.x86_64
error: Failed dependencies:
 systemd-libs = 219-30.el7 is needed by (installed) libgudev1-219-30.el7.x86_64

//仍然出现依赖问题，继续查询libgudev1的版本信息
# rpm -q libgudev1
libgudev1-219-30.el7.x86_64

//发现只有一个版本，升级试一下
# yum update libgudev1
......
Updated:
 libgudev1.x86_64 0:219-42.el7_4.1                              

Complete!
# rpm -q libgudev1
libgudev1-219-42.el7_4.1.x86_64

//升级完成后，删除旧版本的systemd-libs
# rpm -e systemd-libs-219-30.el7.x86_64
# rpm -q systemd-libs
systemd-libs-219-42.el7_4.1.x86_64

最后查询发现只剩下最新版本的systemd-libs，其他重复版本包的解决，也是同样的过程。

核心的命令主要是：

rpm -q package-names
rpm -e package-full-version

总结

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