[英]How to compare variables from a dynamic inventory in ansible
我一直在嘗試創建一個將比較來自不同主機的文件計數的劇本。
- shell: << code to count number of lines >>
register: record_count
- debug:
msg: "The count is {{ record_count.stdout }}"
- hosts: localhost
tasks:
- name: Fail if the count doesnt match
fail:
msg: "The record count is not matching on both the export files."
when: "{{ hostvars[groups.apa[0].record_count.stdout }} != {{ hostvars[groups.apa[1].record_count.stdout }}"
但由於我們的庫存非常動態,我們似乎無法使用主機組。 我也嘗試將庫存主機名保存在變量上,但據我所知,它保存在托管主機上,而不是保存在我將進行比較的本地主機上,而且我無法使主機變量工作
- name: get current record count in from Latest ldapexport file
shell: << count code here >>
register: record_count
- name: save inventory hostname to variable 1
set_fact:
server1: "{{ inventory_hostname }}"
when: server1 is not defined
run_once: true
- debug:
msg: value of Server 1 is {{ server1 }}
- name: save inventory hostname to variable 2
set_fact:
server2: "{{ inventory_hostname }}"
when: server1 is defined and server2 is not defined
- debug:
msg: value of Server 2 is {{ server2 }}
- name: compare
debug:
msg: they are equal
when: "{{ hostvars[vars[server1]].record_count.stdout }} == {{ hostvars[vars[server2]].record_count.stdout }}"
delegate_to: localhost
run_once: true
任何想法將不勝感激。 謝謝!
問: “...它保存在托管主機上而不是本地主機上...”
A:使用相同的主機運行第 2 次游戲,並且run_once: true
delegate_to: localhost
任務。 例如,下面的庫存和劇本
shell> cat hosts
[my_group1]
test_01
test_02
[my_group2]
test_03
shell> cat playbook.yml
- hosts: my_group1, my_group2
tasks:
- shell: cat /etc/passwd| wc -l
register: record_count
- debug:
var: record_count.stdout
- hosts: my_group1, my_group2
vars:
apa:
- my_group1
- my_group2
tasks:
- debug:
msg: "{{ hostvars[item].record_count.stdout|trim }}"
loop: "{{ groups[apa[0]] }}"
run_once: true
delegate_to: localhost
- debug:
msg: "{{ hostvars[item].record_count.stdout|trim }}"
loop: "{{ groups[apa[1]] }}"
run_once: true
delegate_to: localhost
給(刪減)
shell> ansible-playbook -i hosts playbook.yml
PLAY [my_group1, my_group2] ***************************
ok: [test_01] =>
record_count.stdout: ' 37'
ok: [test_02] =>
record_count.stdout: ' 31'
ok: [test_03] =>
record_count.stdout: ' 29'
PLAY [my_group1, my_group2] ***************************
ok: [test_01 -> localhost] => (item=test_01) =>
msg: '37'
ok: [test_01 -> localhost] => (item=test_02) =>
msg: '31'
ok: [test_01 -> localhost] => (item=test_03) =>
msg: '29'
筆記:
表達式hostvars[groups.apa[0]].record_count.stdout
是錯誤的。 hostvars[groups.apa[0]]
是組apa[0]
中的主機列表。 列表的項目具有屬性record_count
而不是列表。
如果(非常動態的)主機可能會即時消失,請使用default
過濾器。 例如
"{{ hostvars[item].record_count.stdout|default(-1)|trim }}"
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