An Ansible playbook to install docker-ce on Centos

playbook_centos_install_docker.yaml

---
- name: Install docker
  gather_facts: No
  hosts: default

  tasks:
    - name: Install yum utils
      yum:
        name: yum-utils
        state: latest

    - name: Install device-mapper-persistent-data
      yum:
        name: device-mapper-persistent-data
        state: latest

    - name: Install lvm2
      yum:
        name: lvm2
        state: latest

    - name: Add Docker repo
      get_url:
        url: https://download.docker.com/linux/centos/docker-ce.repo
        dest: /etc/yum.repos.d/docer-ce.repo
      become: yes

    - name: Enable Docker Edge repo
      ini_file:
        dest: /etc/yum.repos.d/docer-ce.repo
        section: 'docker-ce-edge'
        option: enabled
        value: 0
      become: yes

    - name: Enable Docker Test repo
      ini_file:
        dest: /etc/yum.repos.d/docer-ce.repo
        section: 'docker-ce-test'
        option: enabled
        value: 0
      become: yes

    - name: Install Docker
      package:
        name: docker-ce
        state: latest
      become: yes

    - name: Start Docker service
      service:
        name: docker
        state: started
        enabled: yes
      become: yes

    - name: Add user vagrant to docker group
      user:
        name: vagrant
        groups: docker
        append: yes
      become: yes

its work ... thanks bro ... good work

TASK [Install Docker]
FAILED! => {"changed": false, "failures": [], "msg": "Depsolve Error occured: \n Problem: cannot install the best candidate for the job\n - nothing provides libcgroup needed by docker-ce-3:19.03.12-3.el7.x86_64\n - nothing provides container-selinux >= 2:2.74 needed by docker-ce-3:19.03.12-3.el7.x86_64", "rc": 1, "result": []}

when installing in RHEL 8

@a19singh : your best option at the moment it is to change the task as for the following

current

• name: Install Docker
  yum:
  name: docker-ce
  state: latest

RHEL 8 version

• name: Install Docker
  shell: "dnf install --nobest docker-ce"

A more clean solution It would be to declare both tasks and set a when conditional, in order to evaluate which version of the current OS it is running and, based on that execute the related task.

The error you see it is due to the fact RH it is trying to stop the usage of docker on their systems, making use of their own tools ( buildah and podman ).

At today the merging of the usage of the --nobest option into the dnf module for ansible it is currently ongoing, that's the reason why it still be necessary to declare it as a ( shell ) command.

source : ansible/ansible#70318

Actually, this is because RHEL's container-tools module provides it's own runc binary, which conflicts with the runc docker-ce provides.

this worked very well for me on centos7, thanks for sharing!

Worked for me, many thks