Ansible YAML中的条件列表元素

时间:2018-07-24 12:41:15

标签: ansible yaml

我有本手册,可以在我们服务器上的docker容器中部署领事。我基本上看起来像这样:

- 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 %}"
...

...,除了最后一行无效。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。

如何有条件地将元素添加到YAML列表/数组?

2 个答案:

答案 0 :(得分:1)

您可以使用数组concat:

- name: consul | run consul servers and agents
  docker_container:
    name: consul
    network_mode: bridge
    published_ports: "{{ [ docker_host_ip ~ ':8301:8301' ] + ([ docker_host_ip ~ ':8300:8300' ] if consul_server is defined else [])}}"

在示例代码中,如果定义了{{ docker_host_ip }}:8300:8300,则consul_server将被添加到列表中。

答案 1 :(得分:1)

Filters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之处):

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

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