Hi,
Can't use yum in the latest base image, rpm -q --qf '%{version}\n' centos-release is used by yum to calculate $releasever.
On the previous release:
[atcloud@sauron-web-5b699b9778-6c6zk app]$ rpm -q --qf '%{version}\n' centos-release
7
On the current release:
[root@0aaf79f74e0e app]# rpm -q --qf '%{version}\n' centos-release
package centos-release is not installed
I worked around this by doing echo 7 > /etc/yum/vars/releasever.