kubespray/roles/etcd/tasks/install_docker.yml

---
- name: Install | Copy etcdctl binary from docker container
  command: sh -c "{{ docker_bin_dir }}/docker rm -f etcdctl-binarycopy;
           {{ docker_bin_dir }}/docker create --name etcdctl-binarycopy {{ etcd_image_repo }}:{{ etcd_image_tag }} &&
           {{ docker_bin_dir }}/docker cp etcdctl-binarycopy:/usr/local/bin/etcdctl {{ bin_dir }}/etcdctl &&
           {{ docker_bin_dir }}/docker rm -f etcdctl-binarycopy"
  register: etcd_task_result
  until: etcd_task_result.rc == 0
  retries: 4
  delay: "{{ retry_stagger | random + 3 }}"
  changed_when: false

- name: Install etcd launch script
  template:
    src: etcd.j2
    dest: "{{ bin_dir }}/etcd"
    owner: 'root'
    mode: 0755
    backup: yes
  notify: restart etcd