1. add this to /etc/yum.repos.d/_copr_\@cloud-init-cloud-init.repo

[group_cloud-init-cloud-init]
name=Copr repo for cloud-init owned by @cloud-init
baseurl=https://copr-be.cloud.fedoraproject.org/results/@cloud-init/cloud-init/epel-7-$basearch/
type=rpm-md
skip_if_unavailable=True
gpgcheck=1
gpgkey=https://copr-be.cloud.fedoraproject.org/results/@cloud-init/cloud-init/pubkey.gpg
repo_gpgcheck=0
enabled=1
enabled_metadata=1

2. yum install epel-release
3. install cloud-init