为不同主机设置访问不同变量的条件

Question

我的/ansible/hosts文件中当前配置了两个主机。但是，我希望这两个主机具有两个不同的变量，但使用相同的jinja2模板来访问它。如何应用条件语句？

My ./var/main.yaml如下所示：

---
- name: Variables for R1
  when: "{{ ansible_host }}" == '198.51.100.4'
  routers_all:
    - {OSPF: 'Yes', OSPF_area: '0', OSPF_id: '1', hostname: R1}
  int_details_R1:
    - {int: Loopback1, ip: 10.0.0.1, mask: 255.255.255.255}
    - {int: FastEthernet0/0, ip: 198.51.100.3, mask: 255.255.255.0}
    - {int: FastEthernet1/0, ip: 198.51.101.3, mask: 255.255.255.0}
    - {int: FastEthernet2/0, ip: 198.51.102.3, mask: 255.255.255.0}

- name: Variables for R2
  when: "{{ ansible_host }}" == '198.51.100.5'
  routers_all:
    - {OSPF: 'Yes', OSPF_area: '0', OSPF_id: '2', hostname: R2}
  int_details_R2:
    - {int: Loopback1, ip: 20.0.0.1, mask: 255.255.255.255}
    - {int: FastEthernet0/0, ip: 198.51.100.4, mask: 255.255.255.0}
    - {int: FastEthernet1/0, ip: 198.51.101.4, mask: 255.255.255.0}

文件结构-

automation@automation:~/lab8/ANSIBLE/RTR-TEMPLATE$ tree
.
├── ospf.yaml
└── roles
    └── router
        ├── tasks
        │   └── main.yaml
        ├── templates
        │   └── router.j2
        └── vars
            └── main.yaml

Answer 1

使用host_vars。创建目录~/lab8/ANSIBLE/RTR-TEMPLATE/host_vars，并使用特定于主机的变量创建文件。

~/lab8/ANSIBLE/RTR-TEMPLATE/host_vars/198.51.100.4

routers_all:
  - {OSPF: 'Yes', OSPF_area: '0', OSPF_id: '1', hostname: R1}
int_details_R1:
  - {int: Loopback1, ip: 10.0.0.1, mask: 255.255.255.255}
  - {int: FastEthernet0/0, ip: 198.51.100.3, mask: 255.255.255.0}
  - {int: FastEthernet1/0, ip: 198.51.101.3, mask: 255.255.255.0}
  - {int: FastEthernet2/0, ip: 198.51.102.3, mask: 255.255.255.0}

~/lab8/ANSIBLE/RTR-TEMPLATE/host_vars/198.51.100.5

routers_all:
  - {OSPF: 'Yes', OSPF_area: '0', OSPF_id: '2', hostname: R2}
int_details_R2:
  - {int: Loopback1, ip: 20.0.0.1, mask: 255.255.255.255}
  - {int: FastEthernet0/0, ip: 198.51.100.4, mask: 255.255.255.0}
  - {int: FastEthernet1/0, ip: 198.51.101.4, mask: 255.255.255.0}

这些变量将由"default vars plugin“添加，如Variable precedence: Where should I put a variable?中所述