centos7使用yum提示有事物未完成的解决办法：

错误提示：

There are unfinished transactions remaining. You might consider running yum-complete-transaction, or "yum-complete-transaction --cleanup-only" and "yum history redo last", first to finish them. If those don't work you'll have to try removing/installing packages by hand (maybe package-cleanup can help).

这种情况是由于在使用yum安装东西的时候，强制退出yum或者yum异常退出造成的，再次使用yum时就会提示上述的错误：
解决：

1、安装yum-complete-transaction，这个工具是在yum-utils这个包里面，所以，需要先安装yum-utils才能使用yum-complete-transaction

# yum -y install yum-utils

2、清理缓存

# yum clean all

3、执行清理未完成事物

# yum-complete-transaction --cleanup-only