Cloud-Init user-data to install Docker on CentOS-7

cloud-config-docker-el7.yml

#cloud-config

---
timezone: "UTC"
write_files:
  - path: "/etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7"
    permissions: "0644"
    owner: "root:root"
    content: |
      -----BEGIN PGP PUBLIC KEY BLOCK-----
      Version: GnuPG v1.4.11 (GNU/Linux)

      mQINBFKuaIQBEAC1UphXwMqCAarPUH/ZsOFslabeTVO2pDk5YnO96f+rgZB7xArB
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      ixDLayWR8ddG/s5kyOi3C0uX/6inzaYyRg+Bh70brqKUK14F1BrrPi29eaKfG+Gu
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      RjsC7FDbL017qxS+ZVA/HGkyfiu4cpgV8VUnbql5eAZ+1Ll6Dw==
      =hdPa
      -----END PGP PUBLIC KEY BLOCK-----
  - path: "/etc/yum/pluginconf.d/fastestmirror.conf"
    permissions: "0644"
    owner: "root:root"
    content: |
      [main]
      enabled=0
      verbose=0
      always_print_best_host = true
      socket_timeout=3
      hostfilepath=timedhosts.txt
      maxhostfileage=10
      maxthreads=15
yum_repos:
  epel:
    name: "Extra Packages for Enterprise Linux 7 - $basearch"
    baseurl: "http://download.fedoraproject.org/pub/epel/7/$basearch"
    metalink: "https://mirrors.fedoraproject.org/metalink?repo=epel-7&arch=$basearch"
    failovermethod: "priority"
    enabled: true
    gpgcheck: true
    gpgkey: "file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7"
packages:
  - chrony
  - docker-compose
  - docker-latest
  - etcd
  - iptables-services
  - yum-plugin-ovl
runcmd:
  - [ sed, -r, -i, -e, 's~^(makestep )[0-9\.]+ (-)?[0-9]+$~\11 -1~', /etc/chrony.conf ]
  - [ systemctl, disable, --force, --now, firewalld ]
  - [ systemctl, mask, --no-block, firewalld ]
  - [ sed, -i, '/DOCKERBINARY=\/usr\/bin\/docker-latest/s~^#~~g', /etc/sysconfig/docker ]
  - [ sed, -i, "s~OPTIONS='--selinux-enabled\\(.*\\)'~OPTIONS='--selinux-enabled=false\\1'~", /etc/sysconfig/docker, /etc/sysconfig/docker-latest ]
  - [ sed, -i, '/STORAGE_DRIVER=.*$/ { $!N; d; }', /etc/sysconfig/docker-latest-storage-setup ]
  - [ /bin/bash, -c, "echo 'STORAGE_DRIVER=overlay' >> /etc/sysconfig/docker-latest-storage-setup" ]
  - [ systemctl, enable, --force, --now, --no-block, docker-latest ]
  - [ systemctl, mask, --no-block, docker ]
  - [ systemctl, enable, --force, --now, --no-block, etcd ]
  - [ timedatectl, set-ntp, false ]
  - [ timedatectl, set-ntp, true ]