The issue is the umask of the root user. With the CIS hardening that has been applied the file shown in the error message (/var/lib/cinder/conversion/tmpy88g_2co) is created with permissions:
-rw-r----- 1 root root 119508992 Jan 30 19:36 tmpk16n731p
On the cinder unit the following will allow volumes to be created:
cp /etc/login.defs /etc/login.defs.cis
sed -i 's/^UMASK.*/UMASK 022/' /etc/login.defs
The issue is the umask of the root user. With the CIS hardening that has been applied the file shown in the error message (/var/lib/ cinder/ conversion/ tmpy88g_ 2co) is created with permissions:
-rw-r----- 1 root root 119508992 Jan 30 19:36 tmpk16n731p
On the cinder unit the following will allow volumes to be created:
cp /etc/login.defs /etc/login.defs.cis
sed -i 's/^UMASK.*/UMASK 022/' /etc/login.defs