我发现解决方案是Ansible安装Docker后Docker守护程序不工作。在我的游戏板中需要添加以下命令。

---
- hosts: webservers
  remote_user: ec2-user
  become: yes
  become_method: sudo
  tasks:
    - name: install docker
      yum: name=docker

    **- name: Ensure service is enabled
      command: service docker restart***

    - name: copying file to remote
      copy:
        src: ./docker
        dest: /home/ec2-user/docker
    - name: Build Docker image from Dockerfile
      docker_image:
        name: web
        path: /home/ec2-user/docker
        state: build
    - name: Running the container
      docker_container:
        image: web:latest
        name: web
    - name: Check if container is running
      shell: docker ps

我也遇到过同样的问题。我尝试执行docker login，得到同样奇怪的错误。在我的例子中，ansible用户没有必要的docker凭据。在这种情况下，解决方案是切换到具有docker凭据的用户：

- name: docker login
  hosts: my_server
  become: yes
  become_user: docker_user
  tasks:
    - docker_login:
        registry: myregistry.com
        username: myusername
        password: mysecret