是否可以在 Ansible 中定义剧本全局变量?

问题描述

我有一个很大的 Ansible playbook，其中在运行时构建了 Docker 镜像.我使用越来越多的数字作为标记来对它们进行版本控制.目前，我必须在每个 hosts: 部分中指定这一点.

I have a large Ansible playbook where Docker images are built when running it. I am using an increasing number as the tag to version them. Currently, I have to specify this in every hosts: section.

我知道有全局变量，但是从我通过搜索ansible"全局变量"发现的结果来看，它们必须在剧本之外进行定义.是否可以为剧本定义全局变量?

I know there are global variables but from what I found by searching for "ansible" "global variables", they have to defined outside of the playbook. Is it possible to define global variables which are global for the playbook?

推荐答案

如果您使用的标签/版本适用于所有主机，则使用 group_vars/all 是一个可行的选择.

If the tag/version you are using is applicable to all hosts, then using group_vars/all is a viable option.

如果修订号特定于 host_vars/host_name 文件中的每个主机条目可能会更好.

If the revision numbers are specific to each host entries in a host_vars/host_name file might be better.

如果您想读取和初始化 var ，然后在每次播放后递增它，那么在剧本中跨播放(或您所说的每个 -hosts)保留该信息变得有点困难.例如，如果您想部署 N 个 docker 实例，您可能会像这样执行一些动态库存魔术:

If you want to read and initial var and then increment it after each play that becomes a bit more difficult to persist that information across plays (or each -hosts as you say) in the playbook. For example if you were looking to deploy N docker instances you might do some dynamic inventory magic like this:

- hosts: localhost
  tasks:
  - add_host: name=docker_{{item}} groups="dockers,other" tag={{item}}
    with_sequence: start={{ext_def_start}} count={{ext_def_num}}


- hosts: docker_*
  tasks:
  - debug: var=tag

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