ansible：在 when 语句中访问最后一个清单列表 item/list 大小

Question

我尝试检查 when 语句中的三重条件，如下所示：

# Run only on the last of the oct_servers (once all the others have been launched) and only when there are at least 2 servers

when: (container_state == "started" and ansible_host == {{ groups['oct_servers'] | last }} and {{ groups['oct_servers'] | length }} > 1 )

但它失败了，并出现警告，指出不应在 when 语句中使用 {{ }} 和 {% %}。我把它排除在外，并尝试了许多可能的组合，但没有成功。上述条件的正确语法是什么？

Answer 1

只需删除 Jinja 定界符即可：

when: container_state == "started" and ansible_host == groups['oct_servers'] | last and groups['oct_servers'] | length > 1

注意 when 条件需要多个条件都为真 can also be expressed as a list:

when: 
  - container_state == "started"
  - ansible_host == groups['oct_servers'] | last
  - groups['oct_servers'] | length > 1

ansible：在 when 语句中访问最后一个清单列表 item/list 大小

ansible: accessing last inventory list item/list size within when statement

jinja2

ansible