要结合ansible事实变量和主机清单变量
生成主机文件将一个初始模板文件从 http://classroom.example.com/content/hosts.j2 下载到/home/student/ansible
完成该模板,以便用它生成以下文件:针对每个清单主机包含一行内容,其格式与/etc/hosts 相同
创建名为/home/student/ansible/hosts.yml 的 playbook,它将使用此模板在 dev 主机组中的主机上生成文件/etc/myhosts 。
该 playbook 运行后, dev 主机组中主机上的文件/etc/myhosts 应针对每个受管主机包含一行内容:
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
172.25.250.10 servera.lab.example.com servera
172.25.250.11 serverb.lab.example.com serverb
172.25.250.12 serverc.lab.example.com serverc
172.25.250.13 serverd.lab.example.com serverd
注:清单主机名称的显示顺序不重要。
不正确的做法（只用事实变量）：
$ cat hosts.j2127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
{% for host in groups['all'] %}
{{ ansible_default_ipv4['address'] }} {{ ansible_fqdn }} {{ ansible_hostname }}
{% endfor %}
hosts.yml:
---
- name: Create myhosts
hosts: dev
tasks:
- name: Create myhosts
template:
src: hosts.j2
dest: /etc/myhosts
$ ansibledev -m shell -a 'cat /etc/myhosts'servera | CHANGED | rc=0 >>
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
172.25.250.10 servera.lab.example.com servera
172.25.250.10 servera.lab.example.com servera
172.25.250.10 servera.lab.example.com servera
172.25.250.10 servera.lab.example.com servera
结合了静态的清单和动态的事实（可以实现在A机上看到B机的实际情况，A机和B机都是受管节点，他们之间互相“检举”）：
https://www.botangdb.com/forum.php?mod=viewthread&tid=1491&page=1&extra=#pid2549
host.j2:
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
{% for host in groups['all'] %}
{{ hostvars['ansible_default_ipv4']['address'] }} {{ hostvars['ansible_fqdn'] }} {{ hostvars['ansible_hostname'] }}
{% endfor %}
hosts.yml:
---
- name: Create myhosts
hosts: all
tasks:
- name: Create myhosts
template:
src: hosts.j2
dest: /etc/myhosts
when:
ansible_hostname in groups['dev']
页:
[1]