Ansible YAML中的条件列表元素 [英] Conditional list element in Ansible YAML

问题描述

我有一本剧本，将领事部署在我们服务器上的docker容器中.我基本上看起来像这样:

I have a playbook to deploy consul in docker containers on our servers. I basically looks like this:

- name: run consul
  hosts: all
  tasks:
    - name: consul | run consul servers and agents
      docker_container:
        name: consul
        network_mode: bridge
        published_ports:
          - "{{ docker_host_ip }}:8301:8301"
          - "{% if consul_server is defined %}{{ docker_host_ip }}:8300:8300{% endif %}"
...

...，除了最后一行不起作用.我只想公开consul作为服务器的8300端口，该服务器存储在每个主机的consul_server变量中.

... except the last line isn't working. I only want to expose port 8300 if consul is deployed as server which is stored in the consul_server variable for each host.

如何有条件地将元素添加到YAML列表/数组?

How do I conditionally append an element to a YAML list/array?

推荐答案

过滤器是你的朋友.

- set_fact:
   myTrue  : true
   myFalse : false
   myList  :
    - first
   myAdd   :
    - second

- debug:
    msg: "When TRUE: {{ myTrue |
           ternary( myList | union( myAdd ), myList ) }}"

- debug:
    msg: "When FALSE: {{ myFalse |
           ternary( myList | union( myAdd ), myList ) }}"

输出(经过微调以消除不相识的地方):

Output (slightly modified to remove irrelevancies):

TASK [test : debug] 
     "msg": "When TRUE: [u'first', u'second']"

TASK [test : debug] 
     "msg": "When FALSE: [u'first']"

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