Error: 
CentOS7 use yum to install program Error:

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

 

Solution:
#rpm –rebuilddb
# yum makecache
It will be OK!