Ansible提供Extra-vars作为嵌套json

问题描述

我正在尝试将ansible用于参数化的docker部署.我希望能够通过命令行指定图像，版本和各种不同的环境变量.

I'm trying to use ansible for a parameterised docker deployment. I want to be able to specify image, version and various different environment variables via the command line.

图像，版本等可以直接指定，但是docker模块的env参数需要字典.这是一个简短的剧本示例:

Image, Version and so on can be specified directly but the env parameter of the docker module requires a dictionary. Here is a shortened playbook example:

-name: some deployment
docker:
   [..]
   name: myname
   [..]
   env:
      FOO: bar
      ANOTHERFOO: anotherbar

在运行时选择环境变量，因此无法在提供的额外var中直接定义它们.该剧本目前看起来像这样:

The environment variables are choosen during runtime, so it is not possible to define them directly in the supplied extra vars. The playbook looks like this at the moment:

-name: some deployment
docker:
   [..]
   name: "{{ name }}"
   [..]
   env: "{{ env }}"

由于env是嵌套字典，因此我们需要提供--extra-vars作为嵌套json.我希望以下方法能起作用:

Since env is a nested dictionary we need to supply the --extra-vars as nested json. I would expected the following to work:

./ansible-playbook [..] --extra-vars '{"name":"myname", "env":{"FOO":"bar", "ANOTHERFOO":"anotherbar"}}' [..]

容器运行后，env的值不存在.直接在剧本中提供json以进行测试是可行的.

After the container is running, the values of env are not there.Supplying the json directly in the playbook for testing purposes works.

我尝试了以下不同的json，但没有任何效果:

I tried the following different json with no working results:

{"name":"myname", "env":{"FOO":"bar", "ANOTHERFOO":"anotherbar"}}

{"name":"myname", "env":[{"FOO":"bar"}, {"ANOTHERFOO":"anotherbar"}]}

如何通过命令行提供和使用嵌套字典，或者这是Jinja2模板引擎的局限性.

How do you supply and use a nested dictionary via command line or is this a limitation of the Jinja2 template engine.

推荐答案

如果需要在YAML/可使用的剧本中使用字典，则使用的正确结构是--extra-vars提供的嵌套json，如问题示例中所示:

The right structure to use if you need a dict in your YAML/ansible playbook is a nested json supplied with --extra-vars like in the questions example:

./ansible-playbook [..] --extra-vars '{"name":"myname", "env":{"FOO":"bar", "ANOTHERFOO":"anotherbar"}}' [..]

和

-name: some deployment
docker:
   [..]
   name: "{{ name }}"
   [..]
   env: "{{ env }}"

出于测试目的，我确实在系统上使用了environment，我将其简称为env.问题是environment是保留变量，并且始终会被覆盖.

For testing purposes I did use environment on my system which I shortened to env as an example. The problem is environment is a reserved variable and always gets overridden.

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