我试图将一个事实从主机 1 传递到主机 2,但是当 ansible 到达主机 2 时 它说“未定义的变量”
代码:
- name: some playbook
gather_facts: no
hosts: host1
tasks:
- set_fact:
fact1: "foo"
- hosts: host2
gather_facts: no
tasks:
- debug:
msg: "{{ fact1 }}"
答案 0 :(得分:3)
set_fact
模块设置宿主变量,您可以使用 hostvars
访问这些变量。
- name: some playbook
gather_facts: no
hosts: host1
tasks:
- set_fact:
fact1: "foo"
- hosts: host2
gather_facts: no
tasks:
- debug:
msg: "{{ hostvars['host1']['fact1'] }}"
答案 1 :(得分:0)
一般来说,这个用例可以通过三个步骤来解决。创建、共享和使用变量。例如,给定库存
shell> cat hosts
host1
host2
剧本按预期工作
- name: Run single host and create facts
hosts: host1
tasks:
- set_fact:
fact1: foo
- name: Share facts among all hosts
hosts: all
tasks:
- set_fact:
fact1: "{{ hostvars.host1.fact1 }}"
run_once: true
- name: Use shared facts
hosts: host2
tasks:
- debug:
var: fact1
如果您将用例扩展为“将事实从一组主机传递到另一组主机”,问题是如何有效地共享变量?动态创建剧本。例如,给定库存
shell> cat hosts
host1
host2
host3
host4
让host1 和host4 创建变量,host2 和host3 使用它们。创建模板
shell> cat share-vars.yml.j2
- name: Share facts among all hosts
hosts: all
tasks:
- set_fact:
{% for i in share_vars %}
{{ i.var }}: "{{ lbr }} hostvars.{{ i.host }}.{{ i.var }} {{ rbr }}"
{% endfor %}
run_once: true
和剧本
shell> cat create-share-vars.yml
- name: Create playbook share-vars.yml
hosts: localhost
vars:
share_vars:
- {host: host1, var: fact1}
- {host: host4, var: fact4}
lbr: "{{ '{{' }}"
rbr: "{{ '}}' }}"
tasks:
- template:
src: share-vars.yml.j2
dest: share-vars.yml
给予
shell> cat share-vars.yml
- name: Share facts among all hosts
hosts: all
tasks:
- set_fact:
fact1: "{{ hostvars.host1.fact1 }}"
fact4: "{{ hostvars.host4.fact4 }}"
run_once: true
导入这个剧本,例如
shell> cat playbook.yml
- hosts: host1
tasks:
- set_fact:
fact1: foo
- hosts: host4
tasks:
- set_fact:
fact4: bar
- import_playbook: share-vars.yml
- hosts: host2,host3
tasks:
- debug:
var: fact1
- debug:
var: fact4
给出(删减)
PLAY [host2,host3] *********************************************************
TASK [debug] ***************************************************************
ok: [host2] =>
fact1: foo
ok: [host3] =>
fact1: foo
TASK [debug] ***************************************************************
ok: [host2] =>
fact4: bar
ok: [host3] =>
fact4: bar
注意事项