尝试运行 yum update 并出现一些错误，似乎无法绕过它们，尝试了“skip-broken”，尝试了 yum-complete-transaction、package-cleanup --dupes、package-cleanup --cleandupes ...似乎都不起作用，这里是 yum update 输出：
Loaded plugins: fastestmirror, priorities, replace
Setting up Update Process
Loading mirror speeds from cached hostfile
* ius: mirror.rackspace.com
drivesrvr | 2.2 kB 00:00
Resolving Dependencies
--> Running transaction check
---> Package coreutils.x86_64 0:8.4-37.el6_7.3 will be updated
--> Processing Dependency: coreutils = 8.4-37.el6_7.3 for package: coreutils-libs-8.4-37.el6_7.3.x86_64
---> Package coreutils.x86_64 0:8.4-43.el6 will be an update
---> Package glibc.i686 0:2.12-1.166.el6_7.7 will be updated
--> Processing Dependency: glibc = 2.12-1.166.el6_7.7 for package: glibc-common-2.12-1.166.el6_7.7.x86_64
---> Package glibc.i686 0:2.12-1.192.el6 will be an update
---> Package krb5-libs.i686 0:1.10.3-42z1.el6_7 will be updated
---> Package krb5-libs.i686 0:1.10.3-57.el6 will be an update
---> Package libselinux.i686 0:2.0.94-5.8.el6 will be updated
---> Package libselinux.i686 0:2.0.94-7.el6 will be an update
---> Package openssl.i686 0:1.0.1e-42.el6_7.4 will be updated
---> Package openssl.i686 0:1.0.1e-48.el6_8.1 will be an update
---> Package python-boto.noarch 0:2.38.0-1.el6 will be obsoleted
---> Package python-rsa.noarch 0:3.1.1-5.el6 will be obsoleted
---> Package python2-boto.noarch 0:2.41.0-1.el6 will be obsoleting
---> Package python2-rsa.noarch 0:3.4.1-1.el6 will be obsoleting
--> Processing Dependency: python-pyasn1 for package: python2-rsa-3.4.1-1.el6.noarch
--> Running transaction check
---> Package coreutils.x86_64 0:8.4-37.el6_7.3 will be updated
--> Processing Dependency: coreutils = 8.4-37.el6_7.3 for package: coreutils-libs-8.4-37.el6_7.3.x86_64
---> Package glibc.i686 0:2.12-1.166.el6_7.7 will be updated
--> Processing Dependency: glibc = 2.12-1.166.el6_7.7 for package: glibc-common-2.12-1.166.el6_7.7.x86_64
---> Package python-pyasn1.noarch 0:0.0.12a-1.el6 will be installed
--> Finished Dependency Resolution
Error: Package: coreutils-libs-8.4-37.el6_7.3.x86_64 (@updates)
Requires: coreutils = 8.4-37.el6_7.3
Removing: coreutils-8.4-37.el6_7.3.x86_64 (@updates)
coreutils = 8.4-37.el6_7.3
Updated By: coreutils-8.4-43.el6.x86_64 (base)
coreutils = 8.4-43.el6
Error: Package: glibc-common-2.12-1.166.el6_7.7.x86_64 (@updates)
Requires: glibc = 2.12-1.166.el6_7.7
Removing: glibc-2.12-1.166.el6_7.7.i686 (@updates)
glibc = 2.12-1.166.el6_7.7
Updated By: glibc-2.12-1.192.el6.i686 (base)
glibc = 2.12-1.192.el6
You could try using --skip-broken to work around the problem
** Found 8 pre-existing rpmdb problem(s), 'yum check' output follows:
coreutils-libs-8.4-43.el6.x86_64 is a duplicate with coreutils-libs-8.4-37.el6_7.3.x86_64
coreutils-libs-8.4-43.el6.x86_64 has missing requires of coreutils = ('0', '8.4', '43.el6')
glibc-2.12-1.192.el6.x86_64 is a duplicate with glibc-2.12-1.166.el6_7.7.i686
glibc-common-2.12-1.192.el6.x86_64 is a duplicate with glibc-common-2.12-1.166.el6_7.7.x86_64
krb5-libs-1.10.3-57.el6.x86_64 is a duplicate with krb5-libs-1.10.3-42z1.el6_7.i686
libselinux-2.0.94-7.el6.x86_64 is a duplicate with libselinux-2.0.94-5.8.el6.i686
openssl-1.0.1e-48.el6_8.1.x86_64 is a duplicate with openssl-1.0.1e-42.el6_7.4.i686
2:shadow-utils-4.1.5.1-5.el6.x86_64 is a duplicate with 2:shadow-utils-4.1.4.2-19.el6_6.1.x86_64
答案1
问题在于 RPM 数据库包含某些软件包的两个条目，既有旧版本，也有新版本。
这种情况发生在之前的 yum 更新被中断，并且之后再也没有完成的时候。就你的情况而言，这种情况可能不止发生过一次。（你应该避免中断 yum 事务。如果一个事务被中断，你应该立即地用 结束它yum-complete-transaction。切勿尝试手动停止正在运行的事务。您以后可以随时撤消它。）
Yum 有时可以恢复，但偶尔也会丢失。在这种情况下，您需要自己解决问题。
有一个名为的工具package-cleanup有时可以修复这些问题，但众所周知，它会尝试选择太多包并尝试删除系统上的所有内容，这就是我一般不信任它的原因。
我会手动修复这个问题。对于每个软件包，这涉及调整 RPM 数据库，使其认为没有重复，然后更新系统。
rpm -e --nodeps --justdb coreutils-libs-8.4-37.el6_7.3.x86_64
rpm -e --nodeps --justdb glibc-2.12-1.166.el6_7.7.i686
请注意，这里我们实际上并没有删除软件包，而只是删除了表明软件包已安装的 rpmdb 条目。
此时应该可以更新系统了，
yum distro-sync
（如果没有，您需要删除其余软件包的 rpmdb 条目，然后重试。）
如果 未重新安装或更新已删除 rpmdb 条目的软件包yum distro-sync，请重新安装它们。