This might be a duplicate of http://ask.projectatomic.io/en/question/5/what-happens-to-new-packages-when-i-run-rpm-ostree-upgrade/?answer=17#post-id-17 but I'll ask anyway.
I noticed my VM on VBox was running way out of time after 17 hours, so I tried to install package "ntpdate" with yum. FYI: This was in the HOST, not in the container.
First there is this GPG-key error:
GPG key retrieval failed: [Errno 14]curl#37 - "Couldn't open file /etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-20-x86_64"
I "solved" this with a symlink to RPM-GPG-KEY-fedora-20-secondary and tried again.
error: cannot open Packages index using db5 - Read-only file system (30) error: cannot open Packages database in /var/lib/rpm
So, what is the right way to install extra packages in the host (not a container)?
(Or sync time of the host? Maybe install NTP-support inside the images, please!)