cloud-init question

#cloud-config
# Common to all machine types

merge_how:
  - name    : list
    settings: [ append ]
  - name    : dict
    settings: [ no_replace , recurse_list ]

yum_repos:
  cloudinit-docker-ce:
    baseurl       : https://download.docker.com/linux/centos/$releasever/$basearch/stable
    enabled       : true
    gpgcheck      : true
    gpgkey        : https://download.docker.com/linux/centos/gpg
    name          : Docker CE Stable - $basearch (cloud-init)
# Specific to management server

yum_repos:
  cloudinit-epel:
    baseurl       : http://download.fedoraproject.org/pub/epel/7/$basearch
    enabled       : true
    failovermethod: priority
    gpgcheck      : true
    gpgkey        : http://download.fedoraproject.org/pub/epel/RPM-GPG-KEY-EPEL-7
    name          : Extra Packages for Enterprise Linux 7 - $basearch (cloud-init)