debuginfo-install is a command of yum-utils, so
yum install yum-utilsdebuginfo-install glibc- if the warning’s still there, edit
/etc/yum.repos.d/CentOS-Debuginfo.repo, setenabled=1
debuginfo-install is a command of yum-utils, so
yum install yum-utilsdebuginfo-install glibc/etc/yum.repos.d/CentOS-Debuginfo.repo, set enabled=1