- name: 获取是否已经安装docker
  shell: 'systemctl status docker|grep Active || echo "NoFound"'
  register: docker_svc

- name: 获取是否已经安装containerd
  shell: 'systemctl status containerd|grep Active || echo "NoFound"'
  register: containerd_svc

# 18.09.x 版本二进制名字有变化，需要做判断
- name: 获取docker版本信息
  shell: "{{ base_dir }}/bin/dockerd --version|cut -d' ' -f3"
  register: docker_ver
  connection: local
  run_once: true
  tags: upgrade_docker, download_docker

- name: debug info
  debug: var="docker_ver"
  tags: upgrade_docker, download_docker

- name: 转换docker版本信息为浮点数
  set_fact: 
    DOCKER_VER: "{{ docker_ver.stdout.split('.')[0]|int + docker_ver.stdout.split('.')[1]|int/100 }}"
  tags: upgrade_docker, download_docker

- name: debug info
  debug: var="DOCKER_VER"
  tags: upgrade_docker, download_docker

- block:
    - name: 准备docker相关目录
      file: name={{ item }} state=directory
      with_items:
      - "{{ bin_dir }}"
      - /etc/docker
    
    - name: 下载 docker 二进制文件
      copy: src={{ base_dir }}/bin/{{ item }} dest={{ bin_dir }}/{{ item }} mode=0755
      with_items:
      - docker-containerd
      - docker-containerd-shim
      - docker-init
      - docker-runc
      - docker
      - docker-containerd-ctr
      - dockerd
      - docker-proxy
      tags: upgrade_docker, download_docker
      when: "DOCKER_VER|float < 18.09"
    
    - name: 下载 docker 二进制文件(>= 18.09.x)
      copy: src={{ base_dir }}/bin/{{ item }} dest={{ bin_dir }}/{{ item }} mode=0755
      with_items:
      - containerd
      - containerd-shim
      - docker-init
      - runc
      - docker
      - ctr
      - dockerd
      - docker-proxy
      tags: upgrade_docker, download_docker
      when: "DOCKER_VER|float >= 18.09"
    
    - name: docker命令自动补全
      copy: src=docker dest=/etc/bash_completion.d/docker mode=0644
    
    - name: docker国内镜像加速
      template: src=daemon.json.j2 dest=/etc/docker/daemon.json
    
    - name: flush-iptables
      shell: "iptables -P INPUT ACCEPT \
            && iptables -F && iptables -X \
            && iptables -F -t nat && iptables -X -t nat \
            && iptables -F -t raw && iptables -X -t raw \
            && iptables -F -t mangle && iptables -X -t mangle"
    
    - name: 创建docker的systemd unit文件
      template: src=docker.service.j2 dest=/etc/systemd/system/docker.service
      tags: upgrade_docker, download_docker
    
    - name: 开机启用docker 服务
      shell: systemctl enable docker
      ignore_errors: true
    
    - name: 开启docker 服务
      shell: systemctl daemon-reload && systemctl restart docker
      tags: upgrade_docker

    - name: 轮询等待docker服务运行
      shell: "systemctl status docker.service|grep Active"
      register: docker_status
      until: '"running" in docker_status.stdout'
      retries: 8
      delay: 2
      tags: upgrade_docker
    
    # 配置 docker 命令软链接，方便单独安装 docker
    - name: 配置 docker 命令软链接
      file: src={{ bin_dir }}/docker dest=/usr/bin/docker state=link
      ignore_errors: true
  when: "'running' not in containerd_svc.stdout and 'running' not in docker_svc.stdout"
    
## 可选 ------安装docker查询镜像 tag的小工具----
- name: 下载 docker-tag
  copy: src=docker-tag dest={{ bin_dir }}/docker-tag mode=0755