参考文档: https://blog.csdn.net/ys5773477/article/details/53814581
error: db5 error(11) from dbenv->open: Resource temporarily unavailable
error: cannot open Packages index using db5 - Resource temporarily unavailable (11)
error: cannot open Packages database in /var/lib/rpm
CRITICAL:yum.main:
Error: rpmdb open failed
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原因：rpm的数据库被损坏了
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解决办法：重建rpmdb数据库
cd /var/lib/rpm
rm -f __db.*
cd ..
rpm --rebuilddb