ansible渲染template时出错unicode object' has no attribute 'ansible_

Question

最近在看《奔跑吧，ansible》，在第四章fact与变量遇到一个问题。
直接使用debug能获取到变量ansible_ens33.ipv4.address，但是按照书中的用法，在template中调用时，有如下报错，意思是，没有这个属性，还是说书中的用法有问题？{{ host_dr.ansible_ens33.ipv4.address }}

hosts

[nat_director]
192.168.101.221

[nat_realserver]
rs1 ansible_ssh_host=192.168.101.222
rs2 ansible_ssh_host=192.168.101.223

playbook.yml

- name: Configure Nat Direcorty
  hosts: nat_director nat_realserver
  vars:
  tasks:
  - name: template ipvsadm conf
    template: 
      src: templates/ipvsadm.j2
      dest: /root/haha
    when: group_names[0] == "nat_director"
  - debug: var=groups.nat_director
  # - debug: var=ansible_ens33.ipv4.address

templates/ipvsadm.j2

{% for host_dr in groups.nat_director %}
-A -t {{ host_dr.ansible_ens33.ipv4.address }}:80 -s rr
{% for host_rs in groups.nat_realserver %}
-a -t {{ host_dr.ansible_ens33.ipv4.address }}:80 -r {{ host_rs.ansible_ens33.ipv4.address }}:80 -m -w 1
{% endfor %}
{% endfor %}

Answer 1

经过验证，书上的例子确实有点问题，应该使用hostvars进行加工

{% for host_dr in groups.nat_director %}
-A -t {{ hostvars[host_dr].ansible_ens33.ipv4.address }}:80 -s rr
    {% for host_rs in groups.nat_realserver %}
-a -t {{ hostvars[host_dr].ansible_ens33.ipv4.address }}:80 -r {{ hostvars[host_rs].ansible_ens33.ipv4.address }}:80 -m -w 1
    {% endfor %}
{% endfor %}