ansible IP

問題解決了，用IP: "{{ ansible_eth0'ipv4' }}"　　　而不是{{ansible_all_ipv4_addresses}}

修改了之后的playbook 如下：

---

- hosts: all
  vars:
        IP: "{{ ansible_eth0['ipv4']['address'] }}"
  tasks:
        - name: 將原有的hosts文件備份
          shell: mv /etc/hosts /etc/hosts_bak

        - name: 將ansible端的hosts復制到各自機器上
          copy: src=/root/hosts dest=/etc/ owner=root group=root mode=0644

        - name: 在新的hosts文件后面追加各自機器內網ip和hostname
          lineinfile: dest=/etc/hosts line="{{IP}}  {{ansible_hostname}}"