Ansible jinja2 templating

Question

在Ansible中，我目前有这样的变量设置

container_a_version: 1
container_b_version: 6
container_c_version: 3
container_d_version: 2
...

containers:
- container_a
- container_b
- container_c
- container_d  
... 

每个容器都有自己的模板文件，其中有一行类似于

image: registry.sportpesa.com/sportpesa/global/container-a:{{ container_a_version }}

我的战术手册

- name: Copy templates
template:
src: templates/docker-compose-{{ item }}.yml
dest: /srv/docker-compose-{{ item }}.yml
loop: "{{ containers }}"

如果我只想部署容器a和c。我将变量更改为这个

containers:
- container_a
# - container_b
- container_c
# - container_d 

我想做的是将我的变量压缩为只有1个变量，就像这个一样

containers:
- { name: a, version: 1 }
- { name: b, version: 6 }
- { name: c, version: 3 }
- { name: d, version: 2 }

但是，我不确定如何在我的模板中调用容器版本。这可能吗？

Answer 1

例如，战术手册

shell> cat pb.yml
- hosts: localhost
vars:
containers:
- {name: a, version: 1}
- {name: b, version: 2}
tasks:
- template:
src: containers.txt.j2
dest: containers.txt

和模板

shell> cat containers.txt.j2
{% for item in containers %}
name: {{ item.name }} version {{ item.version }}
{% endfor %}

给出

shell> cat containers.txt
name: a version 1
name: b version 2

---

可以迭代列表

- debug:
msg: "image: registry.example.com/container-{{ item.name }}:container_{{ item.version }}_version"
loop: "{{ containers }}"

给出

msg: 'image: registry.example.com/container-a:container_1_version'
msg: 'image: registry.example.com/container-b:container_2_version'

Answer 2

因为您想要两个不同的模板，每个模板都有各自的容器名称和版本，而不需要循环containers变量。您可以使用渲染两个模板的剧本。在我的例子中，我将调用模板：

• 容器-a
• 容器-b

模板container-a.j2:

image: registry.example.com/container-{{ containers[0]['name'] }}:{{ containers[0]['version'] }}

模板container-b.j2:

image: registry.example.com/container-{{ containers[1]['name'] }}:{{ containers[1]['version'] }}

然后我的剧本将有以下任务：

vars:
containers:
- { name: a, version: 1 }
- { name: b, version: 2 }
tasks:
- template:
src: "container-{{ containers[0]['name'] }}.j2"
dest: "/tmp/container-{{ containers[0]['name'] }}"
- template:
src: "container-{{ containers[1]['name'] }}.j2"
dest: "/tmp/container-{{ containers[1]['name'] }}"

当这个剧本运行时，它呈现/tmp/container-a:

image: registry.example.com/container-a:1

和/tmp/container-b:

image: registry.example.com/container-b:2